/* real.c - implementation of REAL_ARITHMETIC, REAL_VALUE_ATOF,
and support for XFmode IEEE extended real floating point arithmetic.
- Copyright (C) 1993, 1994, 1995, 1996 Free Software Foundation, Inc.
+ Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998,
+ 1999, 2000 Free Software Foundation, Inc.
Contributed by Stephen L. Moshier (moshier@world.std.com).
This file is part of GNU CC.
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
-#include <stdio.h>
-#include <errno.h>
#include "config.h"
+#include "system.h"
#include "tree.h"
-
-#ifndef errno
-extern int errno;
-#endif
+#include "toplev.h"
+#include "tm_p.h"
/* To enable support of XFmode extended real floating point, define
LONG_DOUBLE_TYPE_SIZE 96 in the tm.h file (m68k.h or i386.h).
netlib.att.com: netlib/cephes. */
\f
/* Type of computer arithmetic.
- Only one of DEC, IBM, IEEE, or UNK should get defined.
+ Only one of DEC, IBM, IEEE, C4X, or UNK should get defined.
`IEEE', when REAL_WORDS_BIG_ENDIAN is non-zero, refers generically
to big-endian IEEE floating-point data structure. This definition
no type wider than DFmode. The IBM conversions were contributed by
frank@atom.ansto.gov.au (Frank Crawford).
+ `C4X' refers specifically to the floating point format used on
+ Texas Instruments TMS320C3x and TMS320C4x digital signal
+ processors. This supports QFmode (32-bit float, double) and HFmode
+ (40-bit long double) where BITS_PER_BYTE is 32. Unlike IEEE
+ floats, C4x floats are not rounded to be even. The C4x conversions
+ were contributed by m.hayes@elec.canterbury.ac.nz (Michael Hayes) and
+ Haj.Ten.Brugge@net.HCC.nl (Herman ten Brugge).
+
If LONG_DOUBLE_TYPE_SIZE = 64 (the default, unless tm.h defines it)
then `long double' and `double' are both implemented, but they
both mean DFmode. In this case, the software floating-point
support available here is activated by writing
#define REAL_ARITHMETIC
- in tm.h.
+ in tm.h.
The case LONG_DOUBLE_TYPE_SIZE = 128 activates TFmode support
and may deactivate XFmode since `long double' is used to refer
- to both modes.
+ to both modes. Defining INTEL_EXTENDED_IEEE_FORMAT at the same
+ time enables 80387-style 80-bit floats in a 128-bit padded
+ image, as seen on IA-64.
The macros FLOAT_WORDS_BIG_ENDIAN, HOST_FLOAT_WORDS_BIG_ENDIAN,
contributed by Richard Earnshaw <Richard.Earnshaw@cl.cam.ac.uk>,
/* IBM System/370 style */
#define IBM 1
#else /* it's also not an IBM */
+#if TARGET_FLOAT_FORMAT == C4X_FLOAT_FORMAT
+/* TMS320C3x/C4x style */
+#define C4X 1
+#else /* it's also not a C4X */
#if TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT
#define IEEE
#else /* it's not IEEE either */
-/* UNKnown arithmetic. We don't support this and can't go on. */
+/* UNKnown arithmetic. We don't support this and can't go on. */
unknown arithmetic type
#define UNK 1
#endif /* not IEEE */
+#endif /* not C4X */
#endif /* not IBM */
#endif /* not VAX */
/* Define INFINITY for support of infinity.
Define NANS for support of Not-a-Number's (NaN's). */
-#if !defined(DEC) && !defined(IBM)
+#if !defined(DEC) && !defined(IBM) && !defined(C4X)
#define INFINITY
#define NANS
#endif
-/* Support of NaNs requires support of infinity. */
+/* Support of NaNs requires support of infinity. */
#ifdef NANS
#ifndef INFINITY
#define INFINITY
#endif
\f
/* Find a host integer type that is at least 16 bits wide,
- and another type at least twice whatever that size is. */
+ and another type at least twice whatever that size is. */
#if HOST_BITS_PER_CHAR >= 16
#define EMUSHORT char
#define EMUSHORT_SIZE HOST_BITS_PER_LONG
#define EMULONG_SIZE (2 * HOST_BITS_PER_LONG)
#else
-/* You will have to modify this program to have a smaller unit size. */
+/* You will have to modify this program to have a smaller unit size. */
#define EMU_NON_COMPILE
#endif
#endif
#if HOST_BITS_PER_LONG >= EMULONG_SIZE
#define EMULONG long
#else
-#if HOST_BITS_PER_LONG_LONG >= EMULONG_SIZE
+#if HOST_BITS_PER_LONGLONG >= EMULONG_SIZE
#define EMULONG long long int
#else
-/* You will have to modify this program to have a smaller unit size. */
+/* You will have to modify this program to have a smaller unit size. */
#define EMU_NON_COMPILE
#endif
#endif
#endif
-/* The host interface doesn't work if no 16-bit size exists. */
+/* The host interface doesn't work if no 16-bit size exists. */
#if EMUSHORT_SIZE != 16
#define EMU_NON_COMPILE
#endif
-/* OK to continue compilation. */
+/* OK to continue compilation. */
#ifndef EMU_NON_COMPILE
/* Construct macros to translate between REAL_VALUE_TYPE and e type.
A REAL_VALUE_TYPE is guaranteed to occupy contiguous locations
in memory, with no holes. */
-#if LONG_DOUBLE_TYPE_SIZE == 96
+#if MAX_LONG_DOUBLE_TYPE_SIZE == 96 || \
+ (defined(INTEL_EXTENDED_IEEE_FORMAT) && MAX_LONG_DOUBLE_TYPE_SIZE == 128)
/* Number of 16 bit words in external e type format */
-#define NE 6
-#define MAXDECEXP 4932
-#define MINDECEXP -4956
-#define GET_REAL(r,e) bcopy ((char *) r, (char *) e, 2*NE)
-#define PUT_REAL(e,r) bcopy ((char *) e, (char *) r, 2*NE)
-#else /* no XFmode */
-#if LONG_DOUBLE_TYPE_SIZE == 128
-#define NE 10
-#define MAXDECEXP 4932
-#define MINDECEXP -4977
-#define GET_REAL(r,e) bcopy ((char *) r, (char *) e, 2*NE)
-#define PUT_REAL(e,r) bcopy ((char *) e, (char *) r, 2*NE)
+# define NE 6
+# define MAXDECEXP 4932
+# define MINDECEXP -4956
+# define GET_REAL(r,e) memcpy ((char *)(e), (char *)(r), 2*NE)
+# define PUT_REAL(e,r) \
+ do { \
+ memcpy ((char *)(r), (char *)(e), 2*NE); \
+ if (2*NE < sizeof(*r)) \
+ memset ((char *)(r) + 2*NE, 0, sizeof(*r) - 2*NE); \
+ } while (0)
+# else /* no XFmode */
+# if MAX_LONG_DOUBLE_TYPE_SIZE == 128
+# define NE 10
+# define MAXDECEXP 4932
+# define MINDECEXP -4977
+# define GET_REAL(r,e) memcpy ((char *)(e), (char *)(r), 2*NE)
+# define PUT_REAL(e,r) \
+ do { \
+ memcpy ((char *)(r), (char *)(e), 2*NE); \
+ if (2*NE < sizeof(*r)) \
+ memset ((char *)(r) + 2*NE, 0, sizeof(*r) - 2*NE); \
+ } while (0)
#else
#define NE 6
#define MAXDECEXP 4932
#define MINDECEXP -4956
#ifdef REAL_ARITHMETIC
/* Emulator uses target format internally
- but host stores it in host endian-ness. */
-
-#define GET_REAL(r,e) \
-do { \
- if (HOST_FLOAT_WORDS_BIG_ENDIAN == REAL_WORDS_BIG_ENDIAN) \
- e53toe ((unsigned EMUSHORT*) (r), (e)); \
- else \
- { \
- unsigned EMUSHORT w[4]; \
- w[3] = ((EMUSHORT *) r)[0]; \
- w[2] = ((EMUSHORT *) r)[1]; \
- w[1] = ((EMUSHORT *) r)[2]; \
- w[0] = ((EMUSHORT *) r)[3]; \
- e53toe (w, (e)); \
- } \
+ but host stores it in host endian-ness. */
+
+#define GET_REAL(r,e) \
+do { \
+ if (HOST_FLOAT_WORDS_BIG_ENDIAN == REAL_WORDS_BIG_ENDIAN) \
+ e53toe ((unsigned EMUSHORT *) (r), (e)); \
+ else \
+ { \
+ unsigned EMUSHORT w[4]; \
+ memcpy (&w[3], ((EMUSHORT *) r), sizeof (EMUSHORT)); \
+ memcpy (&w[2], ((EMUSHORT *) r) + 1, sizeof (EMUSHORT)); \
+ memcpy (&w[1], ((EMUSHORT *) r) + 2, sizeof (EMUSHORT)); \
+ memcpy (&w[0], ((EMUSHORT *) r) + 3, sizeof (EMUSHORT)); \
+ e53toe (w, (e)); \
+ } \
} while (0)
-#define PUT_REAL(e,r) \
-do { \
- if (HOST_FLOAT_WORDS_BIG_ENDIAN == REAL_WORDS_BIG_ENDIAN) \
- etoe53 ((e), (unsigned EMUSHORT *) (r)); \
- else \
- { \
- unsigned EMUSHORT w[4]; \
- etoe53 ((e), w); \
- *((EMUSHORT *) r) = w[3]; \
- *((EMUSHORT *) r + 1) = w[2]; \
- *((EMUSHORT *) r + 2) = w[1]; \
- *((EMUSHORT *) r + 3) = w[0]; \
- } \
+#define PUT_REAL(e,r) \
+do { \
+ if (HOST_FLOAT_WORDS_BIG_ENDIAN == REAL_WORDS_BIG_ENDIAN) \
+ etoe53 ((e), (unsigned EMUSHORT *) (r)); \
+ else \
+ { \
+ unsigned EMUSHORT w[4]; \
+ etoe53 ((e), w); \
+ memcpy (((EMUSHORT *) r), &w[3], sizeof (EMUSHORT)); \
+ memcpy (((EMUSHORT *) r) + 1, &w[2], sizeof (EMUSHORT)); \
+ memcpy (((EMUSHORT *) r) + 2, &w[1], sizeof (EMUSHORT)); \
+ memcpy (((EMUSHORT *) r) + 3, &w[0], sizeof (EMUSHORT)); \
+ } \
} while (0)
#else /* not REAL_ARITHMETIC */
#endif /* not REAL_ARITHMETIC */
#endif /* not TFmode */
-#endif /* no XFmode */
+#endif /* not XFmode */
/* Number of 16 bit words in internal format */
/* The exponent of 1.0 */
#define EXONE (0x3fff)
+#if defined(HOST_EBCDIC)
+/* bit 8 is significant in EBCDIC */
+#define CHARMASK 0xff
+#else
+#define CHARMASK 0x7f
+#endif
+
extern int extra_warnings;
extern unsigned EMUSHORT ezero[], ehalf[], eone[], etwo[];
extern unsigned EMUSHORT elog2[], esqrt2[];
-static void endian PROTO((unsigned EMUSHORT *, long *,
+static void endian PARAMS ((unsigned EMUSHORT *, long *,
enum machine_mode));
-static void eclear PROTO((unsigned EMUSHORT *));
-static void emov PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *));
-static void eabs PROTO((unsigned EMUSHORT *));
-static void eneg PROTO((unsigned EMUSHORT *));
-static int eisneg PROTO((unsigned EMUSHORT *));
-static int eisinf PROTO((unsigned EMUSHORT *));
-static int eisnan PROTO((unsigned EMUSHORT *));
-static void einfin PROTO((unsigned EMUSHORT *));
-static void enan PROTO((unsigned EMUSHORT *, int));
-static void emovi PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *));
-static void emovo PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *));
-static void ecleaz PROTO((unsigned EMUSHORT *));
-static void ecleazs PROTO((unsigned EMUSHORT *));
-static void emovz PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *));
-static void einan PROTO((unsigned EMUSHORT *));
-static int eiisnan PROTO((unsigned EMUSHORT *));
-static int eiisneg PROTO((unsigned EMUSHORT *));
-static void eiinfin PROTO((unsigned EMUSHORT *));
-static int eiisinf PROTO((unsigned EMUSHORT *));
-static int ecmpm PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *));
-static void eshdn1 PROTO((unsigned EMUSHORT *));
-static void eshup1 PROTO((unsigned EMUSHORT *));
-static void eshdn8 PROTO((unsigned EMUSHORT *));
-static void eshup8 PROTO((unsigned EMUSHORT *));
-static void eshup6 PROTO((unsigned EMUSHORT *));
-static void eshdn6 PROTO((unsigned EMUSHORT *));
-static void eaddm PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *));\f
-static void esubm PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *));
-static void m16m PROTO((unsigned int, unsigned short *,
+static void eclear PARAMS ((unsigned EMUSHORT *));
+static void emov PARAMS ((unsigned EMUSHORT *, unsigned EMUSHORT *));
+#if 0
+static void eabs PARAMS ((unsigned EMUSHORT *));
+#endif
+static void eneg PARAMS ((unsigned EMUSHORT *));
+static int eisneg PARAMS ((unsigned EMUSHORT *));
+static int eisinf PARAMS ((unsigned EMUSHORT *));
+static int eisnan PARAMS ((unsigned EMUSHORT *));
+static void einfin PARAMS ((unsigned EMUSHORT *));
+#ifdef NANS
+static void enan PARAMS ((unsigned EMUSHORT *, int));
+static void einan PARAMS ((unsigned EMUSHORT *));
+static int eiisnan PARAMS ((unsigned EMUSHORT *));
+static int eiisneg PARAMS ((unsigned EMUSHORT *));
+static void make_nan PARAMS ((unsigned EMUSHORT *, int, enum machine_mode));
+#endif
+static void emovi PARAMS ((unsigned EMUSHORT *, unsigned EMUSHORT *));
+static void emovo PARAMS ((unsigned EMUSHORT *, unsigned EMUSHORT *));
+static void ecleaz PARAMS ((unsigned EMUSHORT *));
+static void ecleazs PARAMS ((unsigned EMUSHORT *));
+static void emovz PARAMS ((unsigned EMUSHORT *, unsigned EMUSHORT *));
+#if 0
+static void eiinfin PARAMS ((unsigned EMUSHORT *));
+#endif
+#ifdef INFINITY
+static int eiisinf PARAMS ((unsigned EMUSHORT *));
+#endif
+static int ecmpm PARAMS ((unsigned EMUSHORT *, unsigned EMUSHORT *));
+static void eshdn1 PARAMS ((unsigned EMUSHORT *));
+static void eshup1 PARAMS ((unsigned EMUSHORT *));
+static void eshdn8 PARAMS ((unsigned EMUSHORT *));
+static void eshup8 PARAMS ((unsigned EMUSHORT *));
+static void eshup6 PARAMS ((unsigned EMUSHORT *));
+static void eshdn6 PARAMS ((unsigned EMUSHORT *));
+static void eaddm PARAMS ((unsigned EMUSHORT *, unsigned EMUSHORT *));\f
+static void esubm PARAMS ((unsigned EMUSHORT *, unsigned EMUSHORT *));
+static void m16m PARAMS ((unsigned int, unsigned short *,
unsigned short *));
-static int edivm PROTO((unsigned short *, unsigned short *));
-static int emulm PROTO((unsigned short *, unsigned short *));
-static void emdnorm PROTO((unsigned EMUSHORT *, int, int, EMULONG, int));
-static void esub PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *,
+static int edivm PARAMS ((unsigned short *, unsigned short *));
+static int emulm PARAMS ((unsigned short *, unsigned short *));
+static void emdnorm PARAMS ((unsigned EMUSHORT *, int, int, EMULONG, int));
+static void esub PARAMS ((unsigned EMUSHORT *, unsigned EMUSHORT *,
unsigned EMUSHORT *));
-static void eadd PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *,
+static void eadd PARAMS ((unsigned EMUSHORT *, unsigned EMUSHORT *,
unsigned EMUSHORT *));
-static void eadd1 PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *,
+static void eadd1 PARAMS ((unsigned EMUSHORT *, unsigned EMUSHORT *,
unsigned EMUSHORT *));
-static void ediv PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *,
+static void ediv PARAMS ((unsigned EMUSHORT *, unsigned EMUSHORT *,
unsigned EMUSHORT *));
-static void emul PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *,
+static void emul PARAMS ((unsigned EMUSHORT *, unsigned EMUSHORT *,
unsigned EMUSHORT *));
-static void e53toe PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *));
-static void e64toe PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *));
-static void e113toe PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *));
-static void e24toe PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *));
-static void etoe113 PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *));
-static void toe113 PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *));
-static void etoe64 PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *));
-static void toe64 PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *));
-static void etoe53 PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *));
-static void toe53 PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *));
-static void etoe24 PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *));
-static void toe24 PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *));
-static int ecmp PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *));
-static void eround PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *));
-static void ltoe PROTO((HOST_WIDE_INT *, unsigned EMUSHORT *));
-static void ultoe PROTO((unsigned HOST_WIDE_INT *, unsigned EMUSHORT *));
-static void eifrac PROTO((unsigned EMUSHORT *, HOST_WIDE_INT *,
+static void e53toe PARAMS ((unsigned EMUSHORT *, unsigned EMUSHORT *));
+static void e64toe PARAMS ((unsigned EMUSHORT *, unsigned EMUSHORT *));
+#ifndef INTEL_EXTENDED_IEEE_FORMAT
+static void e113toe PARAMS ((unsigned EMUSHORT *, unsigned EMUSHORT *));
+#endif
+static void e24toe PARAMS ((unsigned EMUSHORT *, unsigned EMUSHORT *));
+static void etoe113 PARAMS ((unsigned EMUSHORT *, unsigned EMUSHORT *));
+static void toe113 PARAMS ((unsigned EMUSHORT *, unsigned EMUSHORT *));
+static void etoe64 PARAMS ((unsigned EMUSHORT *, unsigned EMUSHORT *));
+static void toe64 PARAMS ((unsigned EMUSHORT *, unsigned EMUSHORT *));
+static void etoe53 PARAMS ((unsigned EMUSHORT *, unsigned EMUSHORT *));
+static void toe53 PARAMS ((unsigned EMUSHORT *, unsigned EMUSHORT *));
+static void etoe24 PARAMS ((unsigned EMUSHORT *, unsigned EMUSHORT *));
+static void toe24 PARAMS ((unsigned EMUSHORT *, unsigned EMUSHORT *));
+static int ecmp PARAMS ((unsigned EMUSHORT *, unsigned EMUSHORT *));
+#if 0
+static void eround PARAMS ((unsigned EMUSHORT *, unsigned EMUSHORT *));
+#endif
+static void ltoe PARAMS ((HOST_WIDE_INT *, unsigned EMUSHORT *));
+static void ultoe PARAMS ((unsigned HOST_WIDE_INT *, unsigned EMUSHORT *));
+static void eifrac PARAMS ((unsigned EMUSHORT *, HOST_WIDE_INT *,
unsigned EMUSHORT *));
-static void euifrac PROTO((unsigned EMUSHORT *, unsigned HOST_WIDE_INT *,
+static void euifrac PARAMS ((unsigned EMUSHORT *, unsigned HOST_WIDE_INT *,
unsigned EMUSHORT *));
-static int eshift PROTO((unsigned EMUSHORT *, int));
-static int enormlz PROTO((unsigned EMUSHORT *));
-static void e24toasc PROTO((unsigned EMUSHORT *, char *, int));
-static void e53toasc PROTO((unsigned EMUSHORT *, char *, int));
-static void e64toasc PROTO((unsigned EMUSHORT *, char *, int));
-static void e113toasc PROTO((unsigned EMUSHORT *, char *, int));
-static void etoasc PROTO((unsigned EMUSHORT *, char *, int));
-static void asctoe24 PROTO((char *, unsigned EMUSHORT *));
-static void asctoe53 PROTO((char *, unsigned EMUSHORT *));
-static void asctoe64 PROTO((char *, unsigned EMUSHORT *));
-static void asctoe113 PROTO((char *, unsigned EMUSHORT *));
-static void asctoe PROTO((char *, unsigned EMUSHORT *));
-static void asctoeg PROTO((char *, unsigned EMUSHORT *, int));
-static void efloor PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *));
-static void efrexp PROTO((unsigned EMUSHORT *, int *,
+static int eshift PARAMS ((unsigned EMUSHORT *, int));
+static int enormlz PARAMS ((unsigned EMUSHORT *));
+#if 0
+static void e24toasc PARAMS ((unsigned EMUSHORT *, char *, int));
+static void e53toasc PARAMS ((unsigned EMUSHORT *, char *, int));
+static void e64toasc PARAMS ((unsigned EMUSHORT *, char *, int));
+static void e113toasc PARAMS ((unsigned EMUSHORT *, char *, int));
+#endif /* 0 */
+static void etoasc PARAMS ((unsigned EMUSHORT *, char *, int));
+static void asctoe24 PARAMS ((const char *, unsigned EMUSHORT *));
+static void asctoe53 PARAMS ((const char *, unsigned EMUSHORT *));
+static void asctoe64 PARAMS ((const char *, unsigned EMUSHORT *));
+#ifndef INTEL_EXTENDED_IEEE_FORMAT
+static void asctoe113 PARAMS ((const char *, unsigned EMUSHORT *));
+#endif
+static void asctoe PARAMS ((const char *, unsigned EMUSHORT *));
+static void asctoeg PARAMS ((const char *, unsigned EMUSHORT *, int));
+static void efloor PARAMS ((unsigned EMUSHORT *, unsigned EMUSHORT *));
+#if 0
+static void efrexp PARAMS ((unsigned EMUSHORT *, int *,
unsigned EMUSHORT *));
-static void eldexp PROTO((unsigned EMUSHORT *, int, unsigned EMUSHORT *));
-static void eremain PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *,
+#endif
+static void eldexp PARAMS ((unsigned EMUSHORT *, int, unsigned EMUSHORT *));
+#if 0
+static void eremain PARAMS ((unsigned EMUSHORT *, unsigned EMUSHORT *,
unsigned EMUSHORT *));
-static void eiremain PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *));
-static void mtherr PROTO((char *, int));
-static void dectoe PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *));
-static void etodec PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *));
-static void todec PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *));
-static void ibmtoe PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *,
+#endif
+static void eiremain PARAMS ((unsigned EMUSHORT *, unsigned EMUSHORT *));
+static void mtherr PARAMS ((const char *, int));
+#ifdef DEC
+static void dectoe PARAMS ((unsigned EMUSHORT *, unsigned EMUSHORT *));
+static void etodec PARAMS ((unsigned EMUSHORT *, unsigned EMUSHORT *));
+static void todec PARAMS ((unsigned EMUSHORT *, unsigned EMUSHORT *));
+#endif
+#ifdef IBM
+static void ibmtoe PARAMS ((unsigned EMUSHORT *, unsigned EMUSHORT *,
enum machine_mode));
-static void etoibm PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *,
+static void etoibm PARAMS ((unsigned EMUSHORT *, unsigned EMUSHORT *,
enum machine_mode));
-static void toibm PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *,
+static void toibm PARAMS ((unsigned EMUSHORT *, unsigned EMUSHORT *,
enum machine_mode));
-static void make_nan PROTO((unsigned EMUSHORT *, int, enum machine_mode));
-static void uditoe PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *));
-static void ditoe PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *));
-static void etoudi PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *));
-static void etodi PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *));
-static void esqrt PROTO((unsigned EMUSHORT *, unsigned EMUSHORT *));
+#endif
+#ifdef C4X
+static void c4xtoe PARAMS ((unsigned EMUSHORT *, unsigned EMUSHORT *,
+ enum machine_mode));
+static void etoc4x PARAMS ((unsigned EMUSHORT *, unsigned EMUSHORT *,
+ enum machine_mode));
+static void toc4x PARAMS ((unsigned EMUSHORT *, unsigned EMUSHORT *,
+ enum machine_mode));
+#endif
+#if 0
+static void uditoe PARAMS ((unsigned EMUSHORT *, unsigned EMUSHORT *));
+static void ditoe PARAMS ((unsigned EMUSHORT *, unsigned EMUSHORT *));
+static void etoudi PARAMS ((unsigned EMUSHORT *, unsigned EMUSHORT *));
+static void etodi PARAMS ((unsigned EMUSHORT *, unsigned EMUSHORT *));
+static void esqrt PARAMS ((unsigned EMUSHORT *, unsigned EMUSHORT *));
+#endif
\f
/* Copy 32-bit numbers obtained from array containing 16-bit numbers,
swapping ends if required, into output array of longs. The
result is normally passed to fprintf by the ASM_OUTPUT_ macros. */
-static void
+static void
endian (e, x, mode)
unsigned EMUSHORT e[];
long x[];
{
switch (mode)
{
-
case TFmode:
- /* Swap halfwords in the fourth long. */
+#ifndef INTEL_EXTENDED_IEEE_FORMAT
+ /* Swap halfwords in the fourth long. */
th = (unsigned long) e[6] & 0xffff;
t = (unsigned long) e[7] & 0xffff;
t |= th << 16;
x[3] = (long) t;
+#endif
case XFmode:
-
- /* Swap halfwords in the third long. */
+ /* Swap halfwords in the third long. */
th = (unsigned long) e[4] & 0xffff;
t = (unsigned long) e[5] & 0xffff;
t |= th << 16;
/* fall into the double case */
case DFmode:
-
- /* swap halfwords in the second word */
+ /* Swap halfwords in the second word. */
th = (unsigned long) e[2] & 0xffff;
t = (unsigned long) e[3] & 0xffff;
t |= th << 16;
x[1] = (long) t;
/* fall into the float case */
- case HFmode:
case SFmode:
-
- /* swap halfwords in the first word */
+ case HFmode:
+ /* Swap halfwords in the first word. */
th = (unsigned long) e[0] & 0xffff;
t = (unsigned long) e[1] & 0xffff;
t |= th << 16;
- x[0] = t;
+ x[0] = (long) t;
break;
default:
}
else
{
- /* Pack the output array without swapping. */
+ /* Pack the output array without swapping. */
switch (mode)
{
-
case TFmode:
-
- /* Pack the fourth long. */
+#ifndef INTEL_EXTENDED_IEEE_FORMAT
+ /* Pack the fourth long. */
th = (unsigned long) e[7] & 0xffff;
t = (unsigned long) e[6] & 0xffff;
t |= th << 16;
x[3] = (long) t;
+#endif
case XFmode:
-
/* Pack the third long.
Each element of the input REAL_VALUE_TYPE array has 16 useful bits
in it. */
/* fall into the double case */
case DFmode:
-
- /* pack the second long */
+ /* Pack the second long */
th = (unsigned long) e[3] & 0xffff;
t = (unsigned long) e[2] & 0xffff;
t |= th << 16;
x[1] = (long) t;
/* fall into the float case */
- case HFmode:
case SFmode:
-
- /* pack the first long */
+ case HFmode:
+ /* Pack the first long */
th = (unsigned long) e[1] & 0xffff;
t = (unsigned long) e[0] & 0xffff;
t |= th << 16;
- x[0] = t;
+ x[0] = (long) t;
break;
default:
/* This is the implementation of the REAL_ARITHMETIC macro. */
-void
+void
earith (value, icode, r1, r2)
REAL_VALUE_TYPE *value;
int icode;
GET_REAL (r1, d1);
GET_REAL (r2, d2);
#ifdef NANS
-/* Return NaN input back to the caller. */
+/* Return NaN input back to the caller. */
if (eisnan (d1))
{
PUT_REAL (d1, value);
/* Truncate REAL_VALUE_TYPE toward zero to signed HOST_WIDE_INT.
implements REAL_VALUE_RNDZINT (x) (etrunci (x)). */
-REAL_VALUE_TYPE
+REAL_VALUE_TYPE
etrunci (x)
REAL_VALUE_TYPE x;
{
/* Truncate REAL_VALUE_TYPE toward zero to unsigned HOST_WIDE_INT;
implements REAL_VALUE_UNSIGNED_RNDZINT (x) (etruncui (x)). */
-REAL_VALUE_TYPE
+REAL_VALUE_TYPE
etruncui (x)
REAL_VALUE_TYPE x;
{
}
-/* This is the REAL_VALUE_ATOF function. It converts a decimal string to
- binary, rounding off as indicated by the machine_mode argument. Then it
- promotes the rounded value to REAL_VALUE_TYPE. */
+/* This is the REAL_VALUE_ATOF function. It converts a decimal or hexadecimal
+ string to binary, rounding off as indicated by the machine_mode argument.
+ Then it promotes the rounded value to REAL_VALUE_TYPE. */
-REAL_VALUE_TYPE
+REAL_VALUE_TYPE
ereal_atof (s, t)
- char *s;
+ const char *s;
enum machine_mode t;
{
unsigned EMUSHORT tem[NE], e[NE];
switch (t)
{
+#ifdef C4X
+ case QFmode:
+ case HFmode:
+ asctoe53 (s, tem);
+ e53toe (tem, e);
+ break;
+#else
case HFmode:
+#endif
+
case SFmode:
asctoe24 (s, tem);
e24toe (tem, e);
break;
+
case DFmode:
asctoe53 (s, tem);
e53toe (tem, e);
break;
- case XFmode:
- asctoe64 (s, tem);
- e64toe (tem, e);
- break;
+
case TFmode:
+#ifndef INTEL_EXTENDED_IEEE_FORMAT
asctoe113 (s, tem);
e113toe (tem, e);
break;
+#endif
+ /* FALLTHRU */
+
+ case XFmode:
+ asctoe64 (s, tem);
+ e64toe (tem, e);
+ break;
+
default:
asctoe (s, e);
}
/* Expansion of REAL_NEGATE. */
-REAL_VALUE_TYPE
+REAL_VALUE_TYPE
ereal_negate (x)
REAL_VALUE_TYPE x;
{
/* REAL_VALUE_FROM_INT macro. */
-void
-ereal_from_int (d, i, j)
+void
+ereal_from_int (d, i, j, mode)
REAL_VALUE_TYPE *d;
HOST_WIDE_INT i, j;
+ enum machine_mode mode;
{
unsigned EMUSHORT df[NE], dg[NE];
HOST_WIDE_INT low, high;
int sign;
+ if (GET_MODE_CLASS (mode) != MODE_FLOAT)
+ abort ();
sign = 0;
low = i;
if ((high = j) < 0)
eadd (df, dg, dg);
if (sign)
eneg (dg);
+
+ /* A REAL_VALUE_TYPE may not be wide enough to hold the two HOST_WIDE_INTS.
+ Avoid double-rounding errors later by rounding off now from the
+ extra-wide internal format to the requested precision. */
+ switch (GET_MODE_BITSIZE (mode))
+ {
+ case 32:
+ etoe24 (dg, df);
+ e24toe (df, dg);
+ break;
+
+ case 64:
+ etoe53 (dg, df);
+ e53toe (df, dg);
+ break;
+
+ case 96:
+ etoe64 (dg, df);
+ e64toe (df, dg);
+ break;
+
+ case 128:
+#ifndef INTEL_EXTENDED_IEEE_FORMAT
+ etoe113 (dg, df);
+ e113toe (df, dg);
+#else
+ etoe64 (dg, df);
+ e64toe (df, dg);
+#endif
+ break;
+
+ default:
+ abort ();
+ }
+
PUT_REAL (dg, d);
}
/* REAL_VALUE_FROM_UNSIGNED_INT macro. */
-void
-ereal_from_uint (d, i, j)
+void
+ereal_from_uint (d, i, j, mode)
REAL_VALUE_TYPE *d;
unsigned HOST_WIDE_INT i, j;
+ enum machine_mode mode;
{
unsigned EMUSHORT df[NE], dg[NE];
unsigned HOST_WIDE_INT low, high;
+ if (GET_MODE_CLASS (mode) != MODE_FLOAT)
+ abort ();
low = i;
high = j;
eldexp (eone, HOST_BITS_PER_WIDE_INT, df);
emul (dg, df, dg);
ultoe (&low, df);
eadd (df, dg, dg);
+
+ /* A REAL_VALUE_TYPE may not be wide enough to hold the two HOST_WIDE_INTS.
+ Avoid double-rounding errors later by rounding off now from the
+ extra-wide internal format to the requested precision. */
+ switch (GET_MODE_BITSIZE (mode))
+ {
+ case 32:
+ etoe24 (dg, df);
+ e24toe (df, dg);
+ break;
+
+ case 64:
+ etoe53 (dg, df);
+ e53toe (df, dg);
+ break;
+
+ case 96:
+ etoe64 (dg, df);
+ e64toe (df, dg);
+ break;
+
+ case 128:
+#ifndef INTEL_EXTENDED_IEEE_FORMAT
+ etoe113 (dg, df);
+ e113toe (df, dg);
+#else
+ etoe64 (dg, df);
+ e64toe (df, dg);
+#endif
+ break;
+
+ default:
+ abort ();
+ }
+
PUT_REAL (dg, d);
}
/* REAL_VALUE_TO_INT macro. */
-void
+void
ereal_to_int (low, high, rr)
HOST_WIDE_INT *low, *high;
REAL_VALUE_TYPE rr;
#ifdef REAL_ARITHMETIC
-/* Check for infinity in a REAL_VALUE_TYPE. */
+/* Check for infinity in a REAL_VALUE_TYPE. */
int
target_isinf (x)
- REAL_VALUE_TYPE x;
+ REAL_VALUE_TYPE x ATTRIBUTE_UNUSED;
{
+#ifdef INFINITY
unsigned EMUSHORT e[NE];
-#ifdef INFINITY
GET_REAL (&x, e);
return (eisinf (e));
#else
#endif
}
-/* Check whether a REAL_VALUE_TYPE item is a NaN. */
+/* Check whether a REAL_VALUE_TYPE item is a NaN. */
int
target_isnan (x)
- REAL_VALUE_TYPE x;
+ REAL_VALUE_TYPE x ATTRIBUTE_UNUSED;
{
+#ifdef NANS
unsigned EMUSHORT e[NE];
-#ifdef NANS
GET_REAL (&x, e);
return (eisnan (e));
#else
/* Check for a negative REAL_VALUE_TYPE number.
- This just checks the sign bit, so that -0 counts as negative. */
+ This just checks the sign bit, so that -0 counts as negative. */
int
target_negative (x)
switch (mode)
{
case TFmode:
+#ifndef INTEL_EXTENDED_IEEE_FORMAT
etoe113 (e, t);
e113toe (t, t);
break;
+#endif
+ /* FALLTHRU */
case XFmode:
etoe64 (e, t);
e53toe (t, t);
break;
- case HFmode:
case SFmode:
+#ifndef C4X
+ case HFmode:
+#endif
etoe24 (e, t);
e24toe (t, t);
break;
+#ifdef C4X
+ case HFmode:
+ case QFmode:
+ etoe53 (e, t);
+ e53toe (t, t);
+ break;
+#endif
+
case SImode:
r = etrunci (arg);
return (r);
return (r);
}
+/* Try to change R into its exact multiplicative inverse in machine mode
+ MODE. Return nonzero function value if successful. */
+
+int
+exact_real_inverse (mode, r)
+ enum machine_mode mode;
+ REAL_VALUE_TYPE *r;
+{
+ unsigned EMUSHORT e[NE], einv[NE];
+ REAL_VALUE_TYPE rinv;
+ int i;
+
+ GET_REAL (r, e);
+
+ /* Test for input in range. Don't transform IEEE special values. */
+ if (eisinf (e) || eisnan (e) || (ecmp (e, ezero) == 0))
+ return 0;
+
+ /* Test for a power of 2: all significand bits zero except the MSB.
+ We are assuming the target has binary (or hex) arithmetic. */
+ if (e[NE - 2] != 0x8000)
+ return 0;
+
+ for (i = 0; i < NE - 2; i++)
+ {
+ if (e[i] != 0)
+ return 0;
+ }
+
+ /* Compute the inverse and truncate it to the required mode. */
+ ediv (e, eone, einv);
+ PUT_REAL (einv, &rinv);
+ rinv = real_value_truncate (mode, rinv);
+
+#ifdef CHECK_FLOAT_VALUE
+ /* This check is not redundant. It may, for example, flush
+ a supposedly IEEE denormal value to zero. */
+ i = 0;
+ if (CHECK_FLOAT_VALUE (mode, rinv, i))
+ return 0;
+#endif
+ GET_REAL (&rinv, einv);
+
+ /* Check the bits again, because the truncation might have
+ generated an arbitrary saturation value on overflow. */
+ if (einv[NE - 2] != 0x8000)
+ return 0;
+
+ for (i = 0; i < NE - 2; i++)
+ {
+ if (einv[i] != 0)
+ return 0;
+ }
+
+ /* Fail if the computed inverse is out of range. */
+ if (eisinf (einv) || eisnan (einv) || (ecmp (einv, ezero) == 0))
+ return 0;
+
+ /* Output the reciprocal and return success flag. */
+ PUT_REAL (einv, r);
+ return 1;
+}
#endif /* REAL_ARITHMETIC defined */
/* Used for debugging--print the value of R in human-readable format
REAL_VALUE_TO_DECIMAL (r, "%.20g", dstr);
fprintf (stderr, "%s", dstr);
-}
+}
\f
/* The following routines convert REAL_VALUE_TYPE to the various floating
point formats that are meaningful to supported computers.
- The results are returned in 32-bit pieces, each piece stored in a `long'.
+ The results are returned in 32-bit pieces, each piece stored in a `long'.
This is so they can be printed by statements like
-
+
fprintf (file, "%lx, %lx", L[0], L[1]);
that will work on both narrow- and wide-word host computers. */
contains four 32-bit pieces of the result, in the order they would appear
in memory. */
-void
+void
etartdouble (r, l)
REAL_VALUE_TYPE r;
long l[];
contains three 32-bit pieces of the result, in the order they would
appear in memory. */
-void
+void
etarldouble (r, l)
REAL_VALUE_TYPE r;
long l[];
/* Convert R to a double precision value. The output array L contains two
32-bit pieces of the result, in the order they would appear in memory. */
-void
+void
etardouble (r, l)
REAL_VALUE_TYPE r;
long l[];
most significant word first,
most significant bit is set)
ei[NI-1] low guard word (0x8000 bit is rounding place)
-
-
-
+
+
+
Routines for external format e-type numbers
-
+
asctoe (string, e) ASCII string to extended double e type
asctoe64 (string, &d) ASCII string to long double
asctoe53 (string, &d) ASCII string to double
e53toe (&d, e) IEEE double precision to e type
e64toe (&d, e) IEEE long double precision to e type
e113toe (&d, e) 128-bit long double precision to e type
+#if 0
eabs (e) absolute value
+#endif
eadd (a, b, c) c = b + a
eclear (e) e = 0
ecmp (a, b) Returns 1 if a > b, 0 if a == b,
emov (a, b) b = a
emul (a, b, c) c = b * a
eneg (e) e = -e
+#if 0
eround (a, b) b = nearest integer value to a
+#endif
esub (a, b, c) c = b - a
+#if 0
e24toasc (&f, str, n) single to ASCII string, n digits after decimal
e53toasc (&d, str, n) double to ASCII string, n digits after decimal
e64toasc (&d, str, n) 80-bit long double to ASCII string
e113toasc (&d, str, n) 128-bit long double to ASCII string
+#endif
etoasc (e, str, n) e to ASCII string, n digits after decimal
etoe24 (e, &f) convert e type to IEEE single precision
etoe53 (e, &d) convert e type to IEEE double precision
eisinf (e) 1 if e has maximum exponent (non-IEEE)
or is infinite (IEEE)
eisnan (e) 1 if e is a NaN
-
+
Routines for internal format exploded e-type numbers
-
+
eaddm (ai, bi) add significands, bi = bi + ai
ecleaz (ei) ei = 0
ecleazs (ei) set ei = 0 but leave its sign alone
eiisnan (ai) 1 if a NaN
eiisneg (ai) 1 if sign bit of ai != 0, else 0
einan (ai) set ai = NaN
+#if 0
eiinfin (ai) set ai = infinity
+#endif
The result is always normalized and rounded to NI-4 word precision
after each arithmetic operation.
Exception flags are NOT fully supported.
-
+
Signaling NaN's are NOT supported; they are treated the same
as quiet NaN's.
-
+
Define INFINITY for support of infinity; otherwise a
saturation arithmetic is implemented.
-
+
Define NANS for support of Not-a-Number items; otherwise the
arithmetic will never produce a NaN output, and might be confused
by a NaN input.
either a or b is a NaN. This means asking `if (ecmp (a,b) < 0)'
may not be legitimate. Use `if (ecmp (a,b) == -1)' for `less than'
if in doubt.
-
+
Denormals are always supported here where appropriate (e.g., not
for conversion to DEC numbers). */
mode, most floating point constants are given as arrays
of octal integers to eliminate decimal to binary conversion
errors that might be introduced by the compiler.
-
+
For computers, such as IBM PC, that follow the IEEE
Standard for Binary Floating Point Arithmetic (ANSI/IEEE
Std 754-1985), the symbol IEEE should be defined.
are provided as arrays of hexadecimal 16 bit integers.
The endian-ness of generated values is controlled by
REAL_WORDS_BIG_ENDIAN.
-
+
To accommodate other types of computer arithmetic, all
constants are also provided in a normal decimal radix
which one can hope are correctly converted to a suitable
format by the available C language compiler. To invoke
this mode, the symbol UNK is defined.
-
+
An important difference among these modes is a predefined
set of machine arithmetic constants for each. The numbers
MACHEP (the machine roundoff error), MAXNUM (largest number
represented), and several other parameters are preset by
the configuration symbol. Check the file const.c to
ensure that these values are correct for your computer.
-
+
For ANSI C compatibility, define ANSIC equal to 1. Currently
- this affects only the atan2 function and others that use it. */
+ this affects only the atan2 function and others that use it. */
/* Constant definitions for math error conditions. */
/* e type constants used by high precision check routines */
-#if LONG_DOUBLE_TYPE_SIZE == 128
+#if MAX_LONG_DOUBLE_TYPE_SIZE == 128 && !defined(INTEL_EXTENDED_IEEE_FORMAT)
/* 0.0 */
unsigned EMUSHORT ezero[NE] =
{0x0000, 0x0000, 0x0000, 0x0000,
/* Clear out entire e-type number X. */
-static void
+static void
eclear (x)
register unsigned EMUSHORT *x;
{
/* Move e-type number from A to B. */
-static void
+static void
emov (a, b)
register unsigned EMUSHORT *a, *b;
{
}
+#if 0
/* Absolute value of e-type X. */
-static void
+static void
eabs (x)
unsigned EMUSHORT x[];
{
/* sign is top bit of last word of external format */
- x[NE - 1] &= 0x7fff;
+ x[NE - 1] &= 0x7fff;
}
+#endif /* 0 */
/* Negate the e-type number X. */
-static void
+static void
eneg (x)
unsigned EMUSHORT x[];
{
/* Return 1 if sign bit of e-type number X is nonzero, else zero. */
-static int
+static int
eisneg (x)
unsigned EMUSHORT x[];
{
/* Return 1 if e-type number X is infinity, else return zero. */
-static int
+static int
eisinf (x)
unsigned EMUSHORT x[];
{
/* Check if e-type number is not a number. The bit pattern is one that we
defined, so we know for sure how to detect it. */
-static int
+static int
eisnan (x)
- unsigned EMUSHORT x[];
+ unsigned EMUSHORT x[] ATTRIBUTE_UNUSED;
{
#ifdef NANS
int i;
/* NaN has maximum exponent */
if ((x[NE - 1] & 0x7fff) != 0x7fff)
return (0);
- /* ... and non-zero significand field. */
+ /* ... and non-zero significand field. */
for (i = 0; i < NE - 1; i++)
{
if (*x++ != 0)
}
/* Fill e-type number X with infinity pattern (IEEE)
- or largest possible number (non-IEEE). */
+ or largest possible number (non-IEEE). */
-static void
+static void
einfin (x)
register unsigned EMUSHORT *x;
{
This generates Intel's quiet NaN pattern for extended real.
The exponent is 7fff, the leading mantissa word is c000. */
-static void
+#ifdef NANS
+static void
enan (x, sign)
register unsigned EMUSHORT *x;
int sign;
*x++ = 0xc000;
*x = (sign << 15) | 0x7fff;
}
+#endif /* NANS */
/* Move in an e-type number A, converting it to exploded e-type B. */
-static void
+static void
emovi (a, b)
unsigned EMUSHORT *a, *b;
{
/* Move out exploded e-type number A, converting it to e type B. */
-static void
+static void
emovo (a, b)
unsigned EMUSHORT *a, *b;
{
/* Clear out exploded e-type number XI. */
-static void
+static void
ecleaz (xi)
register unsigned EMUSHORT *xi;
{
*xi++ = 0;
}
-/* Clear out exploded e-type XI, but don't touch the sign. */
+/* Clear out exploded e-type XI, but don't touch the sign. */
-static void
+static void
ecleazs (xi)
register unsigned EMUSHORT *xi;
{
/* Move exploded e-type number from A to B. */
-static void
+static void
emovz (a, b)
register unsigned EMUSHORT *a, *b;
{
The explicit pattern for this is maximum exponent and
top two significant bits set. */
+#ifdef NANS
static void
einan (x)
unsigned EMUSHORT x[];
x[E] = 0x7fff;
x[M + 1] = 0xc000;
}
+#endif /* NANS */
-/* Return nonzero if exploded e-type X is a NaN. */
+/* Return nonzero if exploded e-type X is a NaN. */
-static int
+#ifdef NANS
+static int
eiisnan (x)
unsigned EMUSHORT x[];
{
}
return (0);
}
+#endif /* NANS */
/* Return nonzero if sign of exploded e-type X is nonzero. */
-static int
+#ifdef NANS
+static int
eiisneg (x)
unsigned EMUSHORT x[];
{
return x[0] != 0;
}
+#endif /* NANS */
+#if 0
/* Fill exploded e-type X with infinity pattern.
This has maximum exponent and significand all zeros. */
ecleaz (x);
x[E] = 0x7fff;
}
+#endif /* 0 */
-/* Return nonzero if exploded e-type X is infinite. */
+/* Return nonzero if exploded e-type X is infinite. */
-static int
+#ifdef INFINITY
+static int
eiisinf (x)
unsigned EMUSHORT x[];
{
return (1);
return (0);
}
-
+#endif /* INFINITY */
/* Compare significands of numbers in internal exploded e-type format.
Guard words are included in the comparison.
/* Shift significand of exploded e-type X down by 1 bit. */
-static void
+static void
eshdn1 (x)
register unsigned EMUSHORT *x;
{
/* Shift significand of exploded e-type X up by 1 bit. */
-static void
+static void
eshup1 (x)
register unsigned EMUSHORT *x;
{
/* Shift significand of exploded e-type X down by 8 bits. */
-static void
+static void
eshdn8 (x)
register unsigned EMUSHORT *x;
{
/* Shift significand of exploded e-type X up by 8 bits. */
-static void
+static void
eshup8 (x)
register unsigned EMUSHORT *x;
{
/* Shift significand of exploded e-type X up by 16 bits. */
-static void
+static void
eshup6 (x)
register unsigned EMUSHORT *x;
{
/* Shift significand of exploded e-type X down by 16 bits. */
-static void
+static void
eshdn6 (x)
register unsigned EMUSHORT *x;
{
/* Add significands of exploded e-type X and Y. X + Y replaces Y. */
-static void
+static void
eaddm (x, y)
unsigned EMUSHORT *x, *y;
{
/* Subtract significands of exploded e-type X and Y. Y - X replaces Y. */
-static void
+static void
esubm (x, y)
unsigned EMUSHORT *x, *y;
{
/* Divide significands */
-int
+int
edivm (den, num)
unsigned EMUSHORT den[], num[];
{
/* Multiply significands */
-int
+
+int
emulm (a, b)
unsigned EMUSHORT a[], b[];
{
/* Radix 65536 versions of multiply and divide. */
/* Multiply significand of e-type number B
- by 16-bit quantity A, return e-type result to C. */
+ by 16-bit quantity A, return e-type result to C. */
static void
m16m (a, b, c)
tdenm = den[M+1];
for (i=M; i<NI; i++)
{
- /* Find trial quotient digit (the radix is 65536). */
+ /* Find trial quotient digit (the radix is 65536). */
tnum = (((unsigned EMULONG) num[M]) << 16) + num[M+1];
- /* Do not execute the divide instruction if it will overflow. */
- if ((tdenm * 0xffffL) < tnum)
+ /* Do not execute the divide instruction if it will overflow. */
+ if ((tdenm * (unsigned long)0xffff) < tnum)
tquot = 0xffff;
else
tquot = tnum / tdenm;
- /* Multiply denominator by trial quotient digit. */
+ /* Multiply denominator by trial quotient digit. */
m16m ((unsigned int)tquot, den, tprod);
- /* The quotient digit may have been overestimated. */
+ /* The quotient digit may have been overestimated. */
if (ecmpm (tprod, num) > 0)
{
tquot -= 1;
The internal format number to be rounded is S.
Input LOST is 0 if the value is exact. This is the so-called sticky bit.
-
+
Input SUBFLG indicates whether the number was obtained
by a subtraction operation. In that case if LOST is nonzero
then the number is slightly smaller than indicated.
-
+
Input EXP is the biased exponent, which may be negative.
the exponent field of S is ignored but is replaced by
EXP as adjusted by normalization and rounding.
-
+
Input RCNTRL is the rounding control. If it is nonzero, the
returned value will be rounded to RNDPRC bits.
adjusted to be the actual value it would have after conversion to
the final floating point type. This adjustment has been
implemented for all type conversions (etoe53, etc.) and decimal
- conversions, but not for the arithmetic functions (eadd, etc.).
+ conversions, but not for the arithmetic functions (eadd, etc.).
Data types having standard 15-bit exponents are not affected by
this, but SFmode and DFmode are affected. For example, ediv with
rndprc = 24 will not round correctly to 24-bit precision if the
static int re = 0;
static unsigned EMUSHORT rbit[NI];
-static void
+static void
emdnorm (s, lost, subflg, exp, rcntrl)
unsigned EMUSHORT s[];
int lost;
/* Normalize */
j = enormlz (s);
- /* a blank significand could mean either zero or infinity. */
+ /* a blank significand could mean either zero or infinity. */
#ifndef INFINITY
if (j > NBITS)
{
return;
}
}
- /* Round off, unless told not to by rcntrl. */
+ /* Round off, unless told not to by rcntrl. */
if (rcntrl == 0)
goto mdfin;
- /* Set up rounding parameters if the control register changed. */
+ /* Set up rounding parameters if the control register changed. */
if (rndprc != rlast)
{
ecleaz (rbit);
re = rw - 1;
rebit = 1;
break;
+
case 113:
rw = 10;
rmsk = 0x7fff;
rebit = 0x8000;
re = rw;
break;
+
case 64:
rw = 7;
rmsk = 0xffff;
re = rw - 1;
rebit = 1;
break;
+
/* For DEC or IBM arithmetic */
case 56:
rw = 6;
rebit = 0x100;
re = rw;
break;
+
case 53:
rw = 6;
rmsk = 0x7ff;
rebit = 0x800;
re = rw;
break;
+
+ /* For C4x arithmetic */
+ case 32:
+ rw = 5;
+ rmsk = 0xffff;
+ rmbit = 0x8000;
+ rebit = 1;
+ re = rw - 1;
+ break;
+
case 24:
rw = 4;
rmsk = 0xff;
s[rw] &= ~rmsk;
if ((r & rmbit) != 0)
{
+#ifndef C4X
if (r == rmbit)
{
if (lost == 0)
goto mddone;
}
}
+#endif
eaddm (rbit, s);
}
mddone:
-/* Undo the temporary shift for denormal values. */
+/* Undo the temporary shift for denormal values. */
if ((exp <= 0) && (rndprc != NBITS)
&& ((rndprc != 64) || ((rndprc == 64) && ! REAL_WORDS_BIG_ENDIAN)))
{
static int subflg = 0;
-static void
+static void
esub (a, b, c)
unsigned EMUSHORT *a, *b, *c;
{
return;
}
/* Infinity minus infinity is a NaN.
- Test for subtracting infinities of the same sign. */
+ Test for subtracting infinities of the same sign. */
if (eisinf (a) && eisinf (b)
&& ((eisneg (a) ^ eisneg (b)) == 0))
{
eadd1 (a, b, c);
}
-/* Add. C = A + B, all e type. */
+/* Add. C = A + B, all e type. */
-static void
+static void
eadd (a, b, c)
unsigned EMUSHORT *a, *b, *c;
{
#ifdef NANS
-/* NaN plus anything is a NaN. */
+/* NaN plus anything is a NaN. */
if (eisnan (a))
{
emov (a, c);
return;
}
/* Infinity minus infinity is a NaN.
- Test for adding infinities of opposite signs. */
+ Test for adding infinities of opposite signs. */
if (eisinf (a) && eisinf (b)
&& ((eisneg (a) ^ eisneg (b)) != 0))
{
/* Arithmetic common to both addition and subtraction. */
-static void
+static void
eadd1 (a, b, c)
unsigned EMUSHORT *a, *b, *c;
{
{
if (bi[j] != 0)
{
- /* This could overflow, but let emovo take care of that. */
ltb += 1;
+ if (ltb >= 0x7fff)
+ {
+ eclear (c);
+ if (ai[0] != 0)
+ eneg (c);
+ einfin (c);
+ return;
+ }
break;
}
}
/* Divide: C = B/A, all e type. */
-static void
+static void
ediv (a, b, c)
unsigned EMUSHORT *a, *b, *c;
{
sign = eisneg(a) ^ eisneg(b);
#ifdef NANS
-/* Return any NaN input. */
+/* Return any NaN input. */
if (eisnan (a))
{
emov (a, c);
emov (b, c);
return;
}
-/* Zero over zero, or infinity over infinity, is a NaN. */
+/* Zero over zero, or infinity over infinity, is a NaN. */
if (((ecmp (a, ezero) == 0) && (ecmp (b, ezero) == 0))
|| (eisinf (a) && eisinf (b)))
{
return;
}
#endif
-/* Infinity over anything else is infinity. */
+/* Infinity over anything else is infinity. */
#ifdef INFINITY
if (eisinf (b))
{
einfin (c);
goto divsign;
}
-/* Anything else over infinity is zero. */
+/* Anything else over infinity is zero. */
if (eisinf (a))
{
eclear (c);
lta = ai[E];
ltb = bi[E];
if (bi[E] == 0)
- { /* See if numerator is zero. */
+ { /* See if numerator is zero. */
for (i = 1; i < NI - 1; i++)
{
if (bi[i] != 0)
/* Multiply e-types A and B, return e-type product C. */
-static void
+static void
emul (a, b, c)
unsigned EMUSHORT *a, *b, *c;
{
sign = eisneg(a) ^ eisneg(b);
#ifdef NANS
-/* NaN times anything is the same NaN. */
+/* NaN times anything is the same NaN. */
if (eisnan (a))
{
emov (a, c);
emov (b, c);
return;
}
-/* Zero times infinity is a NaN. */
+/* Zero times infinity is a NaN. */
if ((eisinf (a) && (ecmp (b, ezero) == 0))
|| (eisinf (b) && (ecmp (a, ezero) == 0)))
{
return;
}
#endif
-/* Infinity times anything else is infinity. */
+/* Infinity times anything else is infinity. */
#ifdef INFINITY
if (eisinf (a) || eisinf (b))
{
ibmtoe (pe, y, DFmode);
#else
+#ifdef C4X
+
+ c4xtoe (pe, y, HFmode);
+
+#else
register unsigned EMUSHORT r;
register unsigned EMUSHORT *e, *p;
unsigned EMUSHORT yy[NI];
#endif /* INFINITY */
r >>= 4;
/* If zero exponent, then the significand is denormalized.
- So take back the understood high significand bit. */
+ So take back the understood high significand bit. */
if (r == 0)
{
#endif
eshift (yy, -5);
if (denorm)
- { /* if zero exponent, then normalize the significand */
+ {
+ /* If zero exponent, then normalize the significand. */
if ((k = enormlz (yy)) > NBITS)
ecleazs (yy);
else
yy[E] -= (unsigned EMUSHORT) (k - 1);
}
emovo (yy, y);
+#endif /* not C4X */
#endif /* not IBM */
#endif /* not DEC */
}
/* Convert double extended precision float PE to e type Y. */
-static void
+static void
e64toe (pe, y)
unsigned EMUSHORT *pe, *y;
{
p = yy;
for (i = 0; i < NE - 5; i++)
*p++ = 0;
-/* This precision is not ordinarily supported on DEC or IBM. */
+/* This precision is not ordinarily supported on DEC or IBM. */
#ifdef DEC
for (i = 0; i < 5; i++)
*p++ = *e++;
else
{
p = &yy[0] + (NE - 1);
+#ifdef ARM_EXTENDED_IEEE_FORMAT
+ /* For ARMs, the exponent is in the lowest 15 bits of the word. */
+ *p-- = (e[0] & 0x8000) | (e[1] & 0x7ffff);
+ e += 2;
+#else
*p-- = *e++;
++e;
+#endif
for (i = 0; i < 4; i++)
*p-- = *e++;
}
#ifdef INFINITY
/* Point to the exponent field and check max exponent cases. */
p = &yy[NE - 1];
- if (*p == 0x7fff)
+ if ((*p & 0x7fff) == 0x7fff)
{
#ifdef NANS
if (! REAL_WORDS_BIG_ENDIAN)
}
else
{
- for (i = 1; i <= 4; i++)
+#ifdef ARM_EXTENDED_IEEE_FORMAT
+ for (i = 2; i <= 5; i++)
{
if (pe[i] != 0)
{
return;
}
}
- }
-#endif /* NANS */
+#else /* not ARM */
+ /* In Motorola extended precision format, the most significant
+ bit of an infinity mantissa could be either 1 or 0. It is
+ the lower order bits that tell whether the value is a NaN. */
+ if ((pe[2] & 0x7fff) != 0)
+ goto bigend_nan;
+
+ for (i = 3; i <= 5; i++)
+ {
+ if (pe[i] != 0)
+ {
+bigend_nan:
+ enan (y, (*p & 0x8000) != 0);
+ return;
+ }
+ }
+#endif /* not ARM */
+ }
+#endif /* NANS */
eclear (y);
einfin (y);
if (*p & 0x8000)
*q++ = *p++;
}
+#ifndef INTEL_EXTENDED_IEEE_FORMAT
/* Convert 128-bit long double precision float PE to e type Y. */
-static void
+static void
e113toe (pe, y)
unsigned EMUSHORT *pe, *y;
{
*p++ = *e++;
}
#endif
-/* If denormal, remove the implied bit; else shift down 1. */
+/* If denormal, remove the implied bit; else shift down 1. */
if (r == 0)
{
yy[M] = 0;
}
emovo (yy, y);
}
+#endif
/* Convert single precision float PE to e type Y. */
-static void
+static void
e24toe (pe, y)
unsigned EMUSHORT *pe, *y;
{
ibmtoe (pe, y, SFmode);
#else
+
+#ifdef C4X
+
+ c4xtoe (pe, y, QFmode);
+
+#else
+
register unsigned EMUSHORT r;
register unsigned EMUSHORT *e, *p;
unsigned EMUSHORT yy[NI];
#endif /* INFINITY */
r >>= 7;
/* If zero exponent, then the significand is denormalized.
- So take back the understood high significand bit. */
+ So take back the understood high significand bit. */
if (r == 0)
{
denorm = 1;
yy[E] -= (unsigned EMUSHORT) (k - 1);
}
emovo (yy, y);
+#endif /* not C4X */
#endif /* not IBM */
}
/* Convert e-type X to IEEE 128-bit long double format E. */
-static void
+static void
etoe113 (x, e)
unsigned EMUSHORT *x, *e;
{
rndprc = 113;
emdnorm (xi, 0, 0, exp, 64);
rndprc = rndsav;
+#ifdef INFINITY
nonorm:
+#endif
toe113 (xi, e);
}
/* Convert exploded e-type X, that has already been rounded to
113-bit precision, to IEEE 128-bit long double format Y. */
-static void
+static void
toe113 (a, b)
unsigned EMUSHORT *a, *b;
{
else
q = b + 7; /* point to output exponent */
- /* If not denormal, delete the implied bit. */
+ /* If not denormal, delete the implied bit. */
if (a[E] != 0)
{
eshup1 (a);
/* Convert e-type X to IEEE double extended format E. */
-static void
+static void
etoe64 (x, e)
unsigned EMUSHORT *x, *e;
{
rndprc = 64;
emdnorm (xi, 0, 0, exp, 64);
rndprc = rndsav;
+#ifdef INFINITY
nonorm:
+#endif
toe64 (xi, e);
}
/* Convert exploded e-type X, that has already been rounded to
64-bit precision, to IEEE double extended format Y. */
-static void
+static void
toe64 (a, b)
unsigned EMUSHORT *a, *b;
{
else
{
q = b + 4; /* point to output exponent */
-#if LONG_DOUBLE_TYPE_SIZE == 96
- /* Clear the last two bytes of 12-byte Intel format */
+ /* Clear the last two bytes of 12-byte Intel format. q is pointing
+ into an array of size 6 (e.g. x[NE]), so the last two bytes are
+ always there, and there are never more bytes, even when we are using
+ INTEL_EXTENDED_IEEE_FORMAT. */
*(q+1) = 0;
-#endif
}
#endif
#ifdef IEEE
if (REAL_WORDS_BIG_ENDIAN)
{
+#ifdef ARM_EXTENDED_IEEE_FORMAT
+ /* The exponent is in the lowest 15 bits of the first word. */
+ *q++ = i ? 0x8000 : 0;
+ *q++ = *p++;
+#else
if (i)
*q++ = *p++ | 0x8000;
else
*q++ = *p++;
*q++ = 0;
+#endif
}
else
{
#ifdef DEC
/* Convert e-type X to DEC-format double E. */
-static void
+static void
etoe53 (x, e)
unsigned EMUSHORT *x, *e;
{
/* Convert exploded e-type X, that has already been rounded to
56-bit double precision, to DEC double Y. */
-static void
+static void
toe53 (x, y)
unsigned EMUSHORT *x, *y;
{
#ifdef IBM
/* Convert e-type X to IBM 370-format double E. */
-static void
+static void
etoe53 (x, e)
unsigned EMUSHORT *x, *e;
{
/* Convert exploded e-type X, that has already been rounded to
56-bit precision, to IBM 370 double Y. */
-static void
+static void
toe53 (x, y)
unsigned EMUSHORT *x, *y;
{
toibm (x, y, DFmode);
}
-#else /* it's neither DEC nor IBM */
+#else /* it's neither DEC nor IBM */
+#ifdef C4X
+/* Convert e-type X to C4X-format long double E. */
+
+static void
+etoe53 (x, e)
+ unsigned EMUSHORT *x, *e;
+{
+ etoc4x (x, e, HFmode);
+}
+
+/* Convert exploded e-type X, that has already been rounded to
+ 56-bit precision, to IBM 370 double Y. */
+
+static void
+toe53 (x, y)
+ unsigned EMUSHORT *x, *y;
+{
+ toc4x (x, y, HFmode);
+}
+
+#else /* it's neither DEC nor IBM nor C4X */
/* Convert e-type X to IEEE double E. */
-static void
+static void
etoe53 (x, e)
unsigned EMUSHORT *x, *e;
{
rndprc = 53;
emdnorm (xi, 0, 0, exp, 64);
rndprc = rndsav;
+#ifdef INFINITY
nonorm:
+#endif
toe53 (xi, e);
}
/* Convert exploded e-type X, that has already been rounded to
53-bit precision, to IEEE double Y. */
-static void
+static void
toe53 (x, y)
unsigned EMUSHORT *x, *y;
{
i = *p++;
if (i >= (unsigned int) 2047)
- { /* Saturate at largest number less than infinity. */
+ {
+ /* Saturate at largest number less than infinity. */
#ifdef INFINITY
*y |= 0x7ff0;
if (! REAL_WORDS_BIG_ENDIAN)
}
}
+#endif /* not C4X */
#endif /* not IBM */
#endif /* not DEC */
#ifdef IBM
/* Convert e-type X to IBM 370 float E. */
-static void
+static void
etoe24 (x, e)
unsigned EMUSHORT *x, *e;
{
/* Convert exploded e-type X, that has already been rounded to
float precision, to IBM 370 float Y. */
-static void
+static void
toe24 (x, y)
unsigned EMUSHORT *x, *y;
{
}
#else
+
+#ifdef C4X
+/* Convert e-type X to C4X float E. */
+
+static void
+etoe24 (x, e)
+ unsigned EMUSHORT *x, *e;
+{
+ etoc4x (x, e, QFmode);
+}
+
+/* Convert exploded e-type X, that has already been rounded to
+ float precision, to IBM 370 float Y. */
+
+static void
+toe24 (x, y)
+ unsigned EMUSHORT *x, *y;
+{
+ toc4x (x, y, QFmode);
+}
+
+#else
+
/* Convert e-type X to IEEE float E. DEC float is the same as IEEE float. */
-static void
+static void
etoe24 (x, e)
unsigned EMUSHORT *x, *e;
{
rndprc = 24;
emdnorm (xi, 0, 0, exp, 64);
rndprc = rndsav;
+#ifdef INFINITY
nonorm:
+#endif
toe24 (xi, e);
}
/* Convert exploded e-type X, that has already been rounded to
float precision, to IEEE float Y. */
-static void
+static void
toe24 (x, y)
unsigned EMUSHORT *x, *y;
{
*y = 0x8000; /* output sign bit */
i = *p++;
-/* Handle overflow cases. */
+/* Handle overflow cases. */
if (i >= 255)
{
#ifdef INFINITY
}
#endif
}
+#endif /* not C4X */
#endif /* not IBM */
-/* Compare two e type numbers.
+/* Compare two e type numbers.
Return +1 if a > b
0 if a == b
-1 if a < b
-2 if either a or b is a NaN. */
-static int
+static int
ecmp (a, b)
unsigned EMUSHORT *a, *b;
{
return (-msign); /* p is littler */
}
+#if 0
/* Find e-type nearest integer to X, as floor (X + 0.5). */
-static void
+static void
eround (x, y)
unsigned EMUSHORT *x, *y;
{
eadd (ehalf, x, y);
efloor (y, y);
}
+#endif /* 0 */
/* Convert HOST_WIDE_INT LP to e type Y. */
-static void
+static void
ltoe (lp, y)
HOST_WIDE_INT *lp;
unsigned EMUSHORT *y;
/* Convert unsigned HOST_WIDE_INT LP to e type Y. */
-static void
+static void
ultoe (lp, y)
unsigned HOST_WIDE_INT *lp;
unsigned EMUSHORT *y;
The output e-type fraction FRAC is the positive fractional
part of abs (X). */
-static void
+static void
eifrac (x, i, frac)
unsigned EMUSHORT *x;
HOST_WIDE_INT *i;
FRAC of e-type X. A negative input yields integer output = 0 but
correct fraction. */
-static void
+static void
euifrac (x, i, frac)
unsigned EMUSHORT *x;
unsigned HOST_WIDE_INT *i;
*i = (HOST_WIDE_INT) xi[M] & 0xffff;
}
- if (xi[0]) /* A negative value yields unsigned integer 0. */
+ if (xi[0]) /* A negative value yields unsigned integer 0. */
*i = 0L;
xi[0] = 0;
/* Shift the significand of exploded e-type X up or down by SC bits. */
-static int
+static int
eshift (x, sc)
unsigned EMUSHORT *x;
int sc;
/* Shift normalize the significand area of exploded e-type X.
Return the shift count (up = positive). */
-static int
+static int
enormlz (x)
unsigned EMUSHORT x[];
{
#define NTEN 12
#define MAXP 4096
-#if LONG_DOUBLE_TYPE_SIZE == 128
+#if MAX_LONG_DOUBLE_TYPE_SIZE == 128 && !defined(INTEL_EXTENDED_IEEE_FORMAT)
static unsigned EMUSHORT etens[NTEN + 1][NE] =
{
{0x6576, 0x4a92, 0x804a, 0x153f,
};
#endif
+#if 0
/* Convert float value X to ASCII string STRING with NDIG digits after
the decimal point. */
-static void
+static void
e24toasc (x, string, ndigs)
unsigned EMUSHORT x[];
char *string;
/* Convert double value X to ASCII string STRING with NDIG digits after
the decimal point. */
-static void
+static void
e53toasc (x, string, ndigs)
unsigned EMUSHORT x[];
char *string;
/* Convert double extended value X to ASCII string STRING with NDIG digits
after the decimal point. */
-static void
+static void
e64toasc (x, string, ndigs)
unsigned EMUSHORT x[];
char *string;
/* Convert 128-bit long double value X to ASCII string STRING with NDIG digits
after the decimal point. */
-static void
+static void
e113toasc (x, string, ndigs)
unsigned EMUSHORT x[];
char *string;
e113toe (x, w);
etoasc (w, string, ndigs);
}
+#endif /* 0 */
/* Convert e-type X to ASCII string STRING with NDIGS digits after
the decimal point. */
static char wstring[80]; /* working storage for ASCII output */
-static void
+static void
etoasc (x, string, ndigs)
unsigned EMUSHORT x[];
char *string;
}
tnzro:
- /* Test for infinity. */
+ /* Test for infinity. */
if (y[NE - 1] == 0x7fff)
{
if (sign)
if (i < 0)
{ /* Number is greater than 1 */
- /* Convert significand to an integer and strip trailing decimal zeros. */
+ /* Convert significand to an integer and strip trailing decimal zeros. */
emov (y, u);
u[NE - 1] = EXONE + NBITS - 1;
emov (eone, t);
m = MAXP;
p = &etens[0][0];
- /* An unordered compare result shouldn't happen here. */
+ /* An unordered compare result shouldn't happen here. */
while (ecmp (ten, u) <= 0)
{
if (ecmp (p, u) <= 0)
}
else
{ /* Number is less than 1.0 */
- /* Pad significand with trailing decimal zeros. */
+ /* Pad significand with trailing decimal zeros. */
if (y[NE - 1] == 0)
{
while ((y[NE - 2] & 0x8000) == 0)
ediv (t, eone, t);
}
isone:
- /* Find the first (leading) digit. */
+ /* Find the first (leading) digit. */
emovi (t, w);
emovz (w, t);
emovi (y, w);
*s++ = '-';
else
*s++ = ' ';
- /* Examine number of digits requested by caller. */
+ /* Examine number of digits requested by caller. */
if (ndigs < 0)
ndigs = 0;
if (ndigs > NDEC)
*s++ = (char)digit + '0';
*s++ = '.';
}
- /* Generate digits after the decimal point. */
+ /* Generate digits after the decimal point. */
for (k = 0; k <= ndigs; k++)
{
/* multiply current number by 10, without normalizing */
/* round off the ASCII string */
if (digit > 4)
{
- /* Test for critical rounding case in ASCII output. */
+ /* Test for critical rounding case in ASCII output. */
if (digit == 5)
{
emovo (y, t);
if (ecmp (t, ezero) != 0)
goto roun; /* round to nearest */
+#ifndef C4X
if ((*(s - 1) & 1) == 0)
goto doexp; /* round to even */
+#endif
}
/* Round up and propagate carry-outs */
roun:
--s;
- k = *s & 0x7f;
+ k = *s & CHARMASK;
/* Carry out to most significant digit? */
if (k == '.')
{
/* Convert ASCII string S to single precision float value Y. */
-static void
+static void
asctoe24 (s, y)
- char *s;
+ const char *s;
unsigned EMUSHORT *y;
{
asctoeg (s, y, 24);
/* Convert ASCII string S to double precision value Y. */
-static void
+static void
asctoe53 (s, y)
- char *s;
+ const char *s;
unsigned EMUSHORT *y;
{
#if defined(DEC) || defined(IBM)
asctoeg (s, y, 56);
#else
+#if defined(C4X)
+ asctoeg (s, y, 32);
+#else
asctoeg (s, y, 53);
#endif
+#endif
}
/* Convert ASCII string S to double extended value Y. */
-static void
+static void
asctoe64 (s, y)
- char *s;
+ const char *s;
unsigned EMUSHORT *y;
{
asctoeg (s, y, 64);
}
+#ifndef INTEL_EXTENDED_IEEE_FORMAT
/* Convert ASCII string S to 128-bit long double Y. */
-static void
+static void
asctoe113 (s, y)
- char *s;
+ const char *s;
unsigned EMUSHORT *y;
{
asctoeg (s, y, 113);
}
+#endif
/* Convert ASCII string S to e type Y. */
-static void
+static void
asctoe (s, y)
- char *s;
+ const char *s;
unsigned EMUSHORT *y;
{
asctoeg (s, y, NBITS);
}
/* Convert ASCII string SS to e type Y, with a specified rounding precision
- of OPREC bits. */
+ of OPREC bits. BASE is 16 for C99 hexadecimal floating constants. */
-static void
+static void
asctoeg (ss, y, oprec)
- char *ss;
+ const char *ss;
unsigned EMUSHORT *y;
int oprec;
{
unsigned EMUSHORT yy[NI], xt[NI], tt[NI];
int esign, decflg, sgnflg, nexp, exp, prec, lost;
- int k, trail, c, rndsav;
+ int i, k, trail, c, rndsav;
EMULONG lexp;
- unsigned EMUSHORT nsign, *p;
+ unsigned EMUSHORT nsign;
char *sp, *s, *lstr;
+ int base = 10;
- /* Copy the input string. */
+ /* Copy the input string. */
lstr = (char *) alloca (strlen (ss) + 1);
- s = ss;
- while (*s == ' ') /* skip leading spaces */
- ++s;
+
+ while (*ss == ' ') /* skip leading spaces */
+ ++ss;
+
sp = lstr;
- while ((*sp++ = *s++) != '\0')
+ while ((*sp++ = *ss++) != '\0')
;
s = lstr;
+ if (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'))
+ {
+ base = 16;
+ s += 2;
+ }
+
rndsav = rndprc;
rndprc = NBITS; /* Set to full precision */
lost = 0;
trail = 0;
nxtcom:
- k = *s - '0';
- if ((k >= 0) && (k <= 9))
+ if (*s >= '0' && *s <= '9')
+ k = *s - '0';
+ else if (*s >= 'a' && *s <= 'f')
+ k = 10 + *s - 'a';
+ else
+ k = 10 + *s - 'A';
+ if ((k >= 0) && (k < base))
{
/* Ignore leading zeros */
if ((prec == 0) && (decflg == 0) && (k == 0))
goto donchr;
- /* Identify and strip trailing zeros after the decimal point. */
+ /* Identify and strip trailing zeros after the decimal point. */
if ((trail == 0) && (decflg != 0))
{
sp = s;
- while ((*sp >= '0') && (*sp <= '9'))
+ while ((*sp >= '0' && *sp <= '9')
+ || (base == 16 && ((*sp >= 'a' && *sp <= 'f')
+ || (*sp >= 'A' && *sp <= 'F'))))
++sp;
/* Check for syntax error */
- c = *sp & 0x7f;
- if ((c != 'e') && (c != 'E') && (c != '\0')
+ c = *sp & CHARMASK;
+ if ((base != 10 || ((c != 'e') && (c != 'E')))
+ && (base != 16 || ((c != 'p') && (c != 'P')))
+ && (c != '\0')
&& (c != '\n') && (c != '\r') && (c != ' ')
&& (c != ','))
- goto error;
+ goto unexpected_char_error;
--sp;
while (*sp == '0')
*sp-- = 'z';
if (yy[2] == 0)
{
- if (decflg)
- nexp += 1; /* count digits after decimal point */
- eshup1 (yy); /* multiply current number by 10 */
- emovz (yy, xt);
- eshup1 (xt);
- eshup1 (xt);
- eaddm (xt, yy);
+ if (base == 16)
+ {
+ if (decflg)
+ nexp += 4; /* count digits after decimal point */
+
+ eshup1 (yy); /* multiply current number by 16 */
+ eshup1 (yy);
+ eshup1 (yy);
+ eshup1 (yy);
+ }
+ else
+ {
+ if (decflg)
+ nexp += 1; /* count digits after decimal point */
+
+ eshup1 (yy); /* multiply current number by 10 */
+ emovz (yy, xt);
+ eshup1 (xt);
+ eshup1 (xt);
+ eaddm (xt, yy);
+ }
+ /* Insert the current digit. */
ecleaz (xt);
xt[NI - 2] = (unsigned EMUSHORT) k;
eaddm (xt, yy);
lost |= k;
/* Count lost digits before the decimal point. */
if (decflg == 0)
- nexp -= 1;
+ {
+ if (base == 10)
+ nexp -= 1;
+ else
+ nexp -= 4;
+ }
}
prec += 1;
goto donchr;
break;
case 'E':
case 'e':
+ case 'P':
+ case 'p':
goto expnt;
case '.': /* decimal point */
if (decflg)
- goto error;
+ goto unexpected_char_error;
++decflg;
break;
case '-':
nsign = 0xffff;
if (sgnflg)
- goto error;
+ goto unexpected_char_error;
++sgnflg;
break;
case '+':
if (sgnflg)
- goto error;
+ goto unexpected_char_error;
++sgnflg;
break;
case ',':
case 'I':
goto infinite;
default:
- error:
+ unexpected_char_error:
#ifdef NANS
einan (yy);
#else
/* Exponent interpretation */
expnt:
+ /* 0.0eXXX is zero, regardless of XXX. Check for the 0.0. */
+ for (k = 0; k < NI; k++)
+ {
+ if (yy[k] != 0)
+ goto read_expnt;
+ }
+ goto aexit;
+read_expnt:
esign = 1;
exp = 0;
++s;
{
exp *= 10;
exp += *s++ - '0';
- if (exp > -(MINDECEXP))
- {
- if (esign < 0)
- goto zero;
- else
- goto infinite;
- }
+ if (exp > 999999)
+ break;
}
if (esign < 0)
exp = -exp;
- if (exp > MAXDECEXP)
+ if ((exp > MAXDECEXP) && (base == 10))
{
infinite:
ecleaz (yy);
yy[E] = 0x7fff; /* infinity */
goto aexit;
}
- if (exp < MINDECEXP)
+ if ((exp < MINDECEXP) && (base == 10))
{
zero:
ecleaz (yy);
}
daldone:
+ if (base == 16)
+ {
+ /* Base 16 hexadecimal floating constant. */
+ if ((k = enormlz (yy)) > NBITS)
+ {
+ ecleaz (yy);
+ goto aexit;
+ }
+ /* Adjust the exponent. NEXP is the number of hex digits,
+ EXP is a power of 2. */
+ lexp = (EXONE - 1 + NBITS) - k + yy[E] + exp - nexp;
+ if (lexp > 0x7fff)
+ goto infinite;
+ if (lexp < 0)
+ goto zero;
+ yy[E] = lexp;
+ goto expdon;
+ }
+
nexp = exp - nexp;
- /* Pad trailing zeros to minimize power of 10, per IEEE spec. */
+ /* Pad trailing zeros to minimize power of 10, per IEEE spec. */
while ((nexp > 0) && (yy[2] == 0))
{
emovz (yy, xt);
}
lexp = (EXONE - 1 + NBITS) - k;
emdnorm (yy, lost, 0, lexp, 64);
+ lost = 0;
/* Convert to external format:
esign = -1;
if (nexp > 4096)
{
- /* Punt. Can't handle this without 2 divides. */
+ /* Punt. Can't handle this without 2 divides. */
emovi (etens[0], tt);
lexp -= tt[E];
k = edivm (tt, yy);
nexp -= 4096;
}
}
- p = &etens[NTEN][0];
emov (eone, xt);
exp = 1;
+ i = NTEN;
do
{
if (exp & nexp)
- emul (p, xt, xt);
- p -= NE;
+ emul (etens[i], xt, xt);
+ i--;
exp = exp + exp;
}
while (exp <= MAXP);
k = emulm (tt, yy);
lexp -= EXONE - 1;
}
+ lost = k;
expdon:
/* Round and convert directly to the destination type */
if (oprec == 53)
lexp -= EXONE - 0x3ff;
+#ifdef C4X
+ else if (oprec == 24 || oprec == 32)
+ lexp -= (EXONE - 0x7f);
+#else
#ifdef IBM
else if (oprec == 24 || oprec == 56)
lexp -= EXONE - (0x41 << 2);
#else
else if (oprec == 24)
lexp -= EXONE - 0177;
-#endif
+#endif /* IBM */
+#endif /* C4X */
#ifdef DEC
else if (oprec == 56)
lexp -= EXONE - 0201;
#endif
rndprc = oprec;
- emdnorm (yy, k, 0, lexp, 64);
+ emdnorm (yy, lost, 0, lexp, 64);
aexit:
toibm (yy, y, DFmode);
break;
#endif
+#ifdef C4X
+ case 32:
+ toc4x (yy, y, HFmode);
+ break;
+#endif
+
case 53:
toe53 (yy, y);
break;
0x0000,
};
-static void
+static void
efloor (x, y)
unsigned EMUSHORT x[], y[];
{
}
+#if 0
/* Return S and EXP such that S * 2^EXP = X and .5 <= S < 1.
For example, 1.1 = 0.55 * 2^1. */
-static void
+static void
efrexp (x, exp, s)
unsigned EMUSHORT x[];
int *exp;
emovo (xi, s);
*exp = (int) (li - 0x3ffe);
}
+#endif
/* Return e type Y = X * 2^PWR2. */
-static void
+static void
eldexp (x, pwr2, y)
unsigned EMUSHORT x[];
int pwr2;
}
+#if 0
/* C = remainder after dividing B by A, all e type values.
Least significant integer quotient bits left in EQUOT. */
-static void
+static void
eremain (a, b, c)
unsigned EMUSHORT a[], b[], c[];
{
num[0] = 0xffff;
emovo (num, c);
}
+#endif
/* Return quotient of exploded e-types NUM / DEN in EQUOT,
remainder in NUM. */
-static void
+static void
eiremain (den, num)
unsigned EMUSHORT den[], num[];
{
}
/* Report an error condition CODE encountered in function NAME.
- CODE is one of the following:
Mnemonic Value Significance
-
+
DOMAIN 1 argument domain error
SING 2 function singularity
OVERFLOW 3 overflow range error
INVALID 7 NaN - producing operation
EDOM 33 Unix domain error code
ERANGE 34 Unix range error code
-
+
The order of appearance of the following messages is bound to the
error codes defined above. */
-#define NMSGS 8
-static char *ermsg[NMSGS] =
-{
- "unknown", /* error code 0 */
- "domain", /* error code 1 */
- "singularity", /* et seq. */
- "overflow",
- "underflow",
- "total loss of precision",
- "partial loss of precision",
- "invalid operation"
-};
-
int merror = 0;
extern int merror;
-static void
+static void
mtherr (name, code)
- char *name;
+ const char *name;
int code;
{
- char errstr[80];
-
/* The string passed by the calling program is supposed to be the
name of the function in which the error occurred.
The code argument selects which error message string will be printed. */
- if ((code <= 0) || (code >= NMSGS))
- code = 0;
- sprintf (errstr, " %s %s error", name, ermsg[code]);
+ if (strcmp (name, "esub") == 0)
+ name = "subtraction";
+ else if (strcmp (name, "ediv") == 0)
+ name = "division";
+ else if (strcmp (name, "emul") == 0)
+ name = "multiplication";
+ else if (strcmp (name, "enormlz") == 0)
+ name = "normalization";
+ else if (strcmp (name, "etoasc") == 0)
+ name = "conversion to text";
+ else if (strcmp (name, "asctoe") == 0)
+ name = "parsing";
+ else if (strcmp (name, "eremain") == 0)
+ name = "modulus";
+ else if (strcmp (name, "esqrt") == 0)
+ name = "square root";
if (extra_warnings)
- warning (errstr);
+ {
+ switch (code)
+ {
+ case DOMAIN: warning ("%s: argument domain error" , name); break;
+ case SING: warning ("%s: function singularity" , name); break;
+ case OVERFLOW: warning ("%s: overflow range error" , name); break;
+ case UNDERFLOW: warning ("%s: underflow range error" , name); break;
+ case TLOSS: warning ("%s: total loss of precision" , name); break;
+ case PLOSS: warning ("%s: partial loss of precision", name); break;
+ case INVALID: warning ("%s: NaN - producing operation", name); break;
+ default: abort ();
+ }
+ }
+
/* Set global error message word */
merror = code + 1;
}
#ifdef DEC
/* Convert DEC double precision D to e type E. */
-static void
+static void
dectoe (d, e)
unsigned EMUSHORT *d;
unsigned EMUSHORT *e;
/* Convert e type X to DEC double precision D. */
-static void
+static void
etodec (x, d)
unsigned EMUSHORT *x, *d;
{
/* Convert exploded e-type X, that has already been rounded to
56-bit precision, to DEC format double Y. */
-static void
+static void
todec (x, y)
unsigned EMUSHORT *x, *y;
{
#ifdef IBM
/* Convert IBM single/double precision to e type. */
-static void
+static void
ibmtoe (d, e, mode)
unsigned EMUSHORT *d;
unsigned EMUSHORT *e;
{
unsigned EMUSHORT y[NI];
register unsigned EMUSHORT r, *p;
- int rndsav;
ecleaz (y); /* start with a zero */
p = y; /* point to our number */
/* Convert e type to IBM single/double precision. */
-static void
+static void
etoibm (x, d, mode)
unsigned EMUSHORT *x, *d;
enum machine_mode mode;
toibm (xi, d, mode);
}
-static void
+static void
toibm (x, y, mode)
unsigned EMUSHORT *x, *y;
enum machine_mode mode;
}
#endif /* IBM */
+
+#ifdef C4X
+/* Convert C4X single/double precision to e type. */
+
+static void
+c4xtoe (d, e, mode)
+ unsigned EMUSHORT *d;
+ unsigned EMUSHORT *e;
+ enum machine_mode mode;
+{
+ unsigned EMUSHORT y[NI];
+ int r;
+ int isnegative;
+ int size;
+ int i;
+ int carry;
+
+ /* Short-circuit the zero case. */
+ if ((d[0] == 0x8000)
+ && (d[1] == 0x0000)
+ && ((mode == QFmode) || ((d[2] == 0x0000) && (d[3] == 0x0000))))
+ {
+ e[0] = 0;
+ e[1] = 0;
+ e[2] = 0;
+ e[3] = 0;
+ e[4] = 0;
+ e[5] = 0;
+ return;
+ }
+
+ ecleaz (y); /* start with a zero */
+ r = d[0]; /* get sign/exponent part */
+ if (r & (unsigned int) 0x0080)
+ {
+ y[0] = 0xffff; /* fill in our sign */
+ isnegative = TRUE;
+ }
+ else
+ {
+ isnegative = FALSE;
+ }
+
+ r >>= 8; /* Shift exponent word down 8 bits. */
+ if (r & 0x80) /* Make the exponent negative if it is. */
+ {
+ r = r | (~0 & ~0xff);
+ }
+
+ if (isnegative)
+ {
+ /* Now do the high order mantissa. We don't "or" on the high bit
+ because it is 2 (not 1) and is handled a little differently
+ below. */
+ y[M] = d[0] & 0x7f;
+
+ y[M+1] = d[1];
+ if (mode != QFmode) /* There are only 2 words in QFmode. */
+ {
+ y[M+2] = d[2]; /* Fill in the rest of our mantissa. */
+ y[M+3] = d[3];
+ size = 4;
+ }
+ else
+ {
+ size = 2;
+ }
+ eshift(y, -8);
+
+ /* Now do the two's complement on the data. */
+
+ carry = 1; /* Initially add 1 for the two's complement. */
+ for (i=size + M; i > M; i--)
+ {
+ if (carry && (y[i] == 0x0000))
+ {
+ /* We overflowed into the next word, carry is the same. */
+ y[i] = carry ? 0x0000 : 0xffff;
+ }
+ else
+ {
+ /* No overflow, just invert and add carry. */
+ y[i] = ((~y[i]) + carry) & 0xffff;
+ carry = 0;
+ }
+ }
+
+ if (carry)
+ {
+ eshift(y, -1);
+ y[M+1] |= 0x8000;
+ r++;
+ }
+ y[1] = r + EXONE;
+ }
+ else
+ {
+ /* Add our e type exponent offset to form our exponent. */
+ r += EXONE;
+ y[1] = r;
+
+ /* Now do the high order mantissa strip off the exponent and sign
+ bits and add the high 1 bit. */
+ y[M] = (d[0] & 0x7f) | 0x80;
+
+ y[M+1] = d[1];
+ if (mode != QFmode) /* There are only 2 words in QFmode. */
+ {
+ y[M+2] = d[2]; /* Fill in the rest of our mantissa. */
+ y[M+3] = d[3];
+ }
+ eshift(y, -8);
+ }
+
+ emovo (y, e);
+}
+
+
+/* Convert e type to C4X single/double precision. */
+
+static void
+etoc4x (x, d, mode)
+ unsigned EMUSHORT *x, *d;
+ enum machine_mode mode;
+{
+ unsigned EMUSHORT xi[NI];
+ EMULONG exp;
+ int rndsav;
+
+ emovi (x, xi);
+
+ /* Adjust exponent for offsets. */
+ exp = (EMULONG) xi[E] - (EXONE - 0x7f);
+
+ /* Round off to nearest or even. */
+ rndsav = rndprc;
+ rndprc = mode == QFmode ? 24 : 32;
+ emdnorm (xi, 0, 0, exp, 64);
+ rndprc = rndsav;
+ toc4x (xi, d, mode);
+}
+
+static void
+toc4x (x, y, mode)
+ unsigned EMUSHORT *x, *y;
+ enum machine_mode mode;
+{
+ int i;
+ int v;
+ int carry;
+
+ /* Short-circuit the zero case */
+ if ((x[0] == 0) /* Zero exponent and sign */
+ && (x[1] == 0)
+ && (x[M] == 0) /* The rest is for zero mantissa */
+ && (x[M+1] == 0)
+ /* Only check for double if necessary */
+ && ((mode == QFmode) || ((x[M+2] == 0) && (x[M+3] == 0))))
+ {
+ /* We have a zero. Put it into the output and return. */
+ *y++ = 0x8000;
+ *y++ = 0x0000;
+ if (mode != QFmode)
+ {
+ *y++ = 0x0000;
+ *y++ = 0x0000;
+ }
+ return;
+ }
+
+ *y = 0;
+
+ /* Negative number require a two's complement conversion of the
+ mantissa. */
+ if (x[0])
+ {
+ *y = 0x0080;
+
+ i = ((int) x[1]) - 0x7f;
+
+ /* Now add 1 to the inverted data to do the two's complement. */
+ if (mode != QFmode)
+ v = 4 + M;
+ else
+ v = 2 + M;
+ carry = 1;
+ while (v > M)
+ {
+ if (x[v] == 0x0000)
+ {
+ x[v] = carry ? 0x0000 : 0xffff;
+ }
+ else
+ {
+ x[v] = ((~x[v]) + carry) & 0xffff;
+ carry = 0;
+ }
+ v--;
+ }
+
+ /* The following is a special case. The C4X negative float requires
+ a zero in the high bit (because the format is (2 - x) x 2^m), so
+ if a one is in that bit, we have to shift left one to get rid
+ of it. This only occurs if the number is -1 x 2^m. */
+ if (x[M+1] & 0x8000)
+ {
+ /* This is the case of -1 x 2^m, we have to rid ourselves of the
+ high sign bit and shift the exponent. */
+ eshift(x, 1);
+ i--;
+ }
+ }
+ else
+ {
+ i = ((int) x[1]) - 0x7f;
+ }
+
+ if ((i < -128) || (i > 127))
+ {
+ y[0] |= 0xff7f;
+ y[1] = 0xffff;
+ if (mode != QFmode)
+ {
+ y[2] = 0xffff;
+ y[3] = 0xffff;
+ }
+#ifdef ERANGE
+ errno = ERANGE;
+#endif
+ return;
+ }
+
+ y[0] |= ((i & 0xff) << 8);
+
+ eshift (x, 8);
+
+ y[0] |= x[M] & 0x7f;
+ y[1] = x[M + 1];
+ if (mode != QFmode)
+ {
+ y[2] = x[M + 2];
+ y[3] = x[M + 3];
+ }
+}
+#endif /* C4X */
+
/* Output a binary NaN bit pattern in the target machine's format. */
/* If special NaN bit patterns are required, define them in tm.h
as arrays of unsigned 16-bit shorts. Otherwise, use the default
- patterns here. */
+ patterns here. */
#ifdef TFMODE_NAN
TFMODE_NAN;
#else
#endif
+#ifdef NANS
static void
make_nan (nan, sign, mode)
unsigned EMUSHORT *nan;
switch (mode)
{
/* Possibly the `reserved operand' patterns on a VAX can be
- used like NaN's, but probably not in the same way as IEEE. */
-#if !defined(DEC) && !defined(IBM)
+ used like NaN's, but probably not in the same way as IEEE. */
+#if !defined(DEC) && !defined(IBM) && !defined(C4X)
case TFmode:
+#ifndef INTEL_EXTENDED_IEEE_FORMAT
n = 8;
if (REAL_WORDS_BIG_ENDIAN)
p = TFbignan;
else
p = TFlittlenan;
break;
+#endif
+ /* FALLTHRU */
+
case XFmode:
n = 6;
if (REAL_WORDS_BIG_ENDIAN)
else
p = XFlittlenan;
break;
+
case DFmode:
n = 4;
if (REAL_WORDS_BIG_ENDIAN)
else
p = DFlittlenan;
break;
- case HFmode:
+
case SFmode:
+ case HFmode:
n = 2;
if (REAL_WORDS_BIG_ENDIAN)
p = SFbignan;
p = SFlittlenan;
break;
#endif
+
default:
abort ();
}
if (REAL_WORDS_BIG_ENDIAN)
- *nan++ = (sign << 15) | *p++;
+ *nan++ = (sign << 15) | (*p++ & 0x7fff);
while (--n != 0)
*nan++ = *p++;
if (! REAL_WORDS_BIG_ENDIAN)
- *nan = (sign << 15) | *p;
+ *nan = (sign << 15) | (*p & 0x7fff);
}
+#endif /* NANS */
-/* Convert an SFmode target `float' value to a REAL_VALUE_TYPE.
- This is the inverse of the function `etarsingle' invoked by
+/* This is the inverse of the function `etarsingle' invoked by
REAL_VALUE_TO_TARGET_SINGLE. */
REAL_VALUE_TYPE
-ereal_from_float (f)
- HOST_WIDE_INT f;
+ereal_unto_float (f)
+ long f;
{
REAL_VALUE_TYPE r;
unsigned EMUSHORT s[2];
}
+/* This is the inverse of the function `etardouble' invoked by
+ REAL_VALUE_TO_TARGET_DOUBLE. */
+
+REAL_VALUE_TYPE
+ereal_unto_double (d)
+ long d[];
+{
+ REAL_VALUE_TYPE r;
+ unsigned EMUSHORT s[4];
+ unsigned EMUSHORT e[NE];
+
+ /* Convert array of HOST_WIDE_INT to equivalent array of 16-bit pieces. */
+ if (REAL_WORDS_BIG_ENDIAN)
+ {
+ s[0] = (unsigned EMUSHORT) (d[0] >> 16);
+ s[1] = (unsigned EMUSHORT) d[0];
+ s[2] = (unsigned EMUSHORT) (d[1] >> 16);
+ s[3] = (unsigned EMUSHORT) d[1];
+ }
+ else
+ {
+ /* Target float words are little-endian. */
+ s[0] = (unsigned EMUSHORT) d[0];
+ s[1] = (unsigned EMUSHORT) (d[0] >> 16);
+ s[2] = (unsigned EMUSHORT) d[1];
+ s[3] = (unsigned EMUSHORT) (d[1] >> 16);
+ }
+ /* Convert target double to E-type. */
+ e53toe (s, e);
+ /* Output E-type to REAL_VALUE_TYPE. */
+ PUT_REAL (e, &r);
+ return r;
+}
+
+
+/* Convert an SFmode target `float' value to a REAL_VALUE_TYPE.
+ This is somewhat like ereal_unto_float, but the input types
+ for these are different. */
+
+REAL_VALUE_TYPE
+ereal_from_float (f)
+ HOST_WIDE_INT f;
+{
+ REAL_VALUE_TYPE r;
+ unsigned EMUSHORT s[2];
+ unsigned EMUSHORT e[NE];
+
+ /* Convert 32 bit integer to array of 16 bit pieces in target machine order.
+ This is the inverse operation to what the function `endian' does. */
+ if (REAL_WORDS_BIG_ENDIAN)
+ {
+ s[0] = (unsigned EMUSHORT) (f >> 16);
+ s[1] = (unsigned EMUSHORT) f;
+ }
+ else
+ {
+ s[0] = (unsigned EMUSHORT) f;
+ s[1] = (unsigned EMUSHORT) (f >> 16);
+ }
+ /* Convert and promote the target float to E-type. */
+ e24toe (s, e);
+ /* Output E-type to REAL_VALUE_TYPE. */
+ PUT_REAL (e, &r);
+ return r;
+}
+
+
/* Convert a DFmode target `double' value to a REAL_VALUE_TYPE.
- This is the inverse of the function `etardouble' invoked by
- REAL_VALUE_TO_TARGET_DOUBLE.
+ This is somewhat like ereal_unto_double, but the input types
+ for these are different.
The DFmode is stored as an array of HOST_WIDE_INT in the target's
data format, with no holes in the bit packing. The first element
/* Convert array of HOST_WIDE_INT to equivalent array of 16-bit pieces. */
if (REAL_WORDS_BIG_ENDIAN)
{
+#if HOST_BITS_PER_WIDE_INT == 32
s[0] = (unsigned EMUSHORT) (d[0] >> 16);
s[1] = (unsigned EMUSHORT) d[0];
-#if HOST_BITS_PER_WIDE_INT == 32
s[2] = (unsigned EMUSHORT) (d[1] >> 16);
s[3] = (unsigned EMUSHORT) d[1];
#else
/* In this case the entire target double is contained in the
first array element. The second element of the input is
ignored. */
- s[2] = (unsigned EMUSHORT) (d[0] >> 48);
- s[3] = (unsigned EMUSHORT) (d[0] >> 32);
+ s[0] = (unsigned EMUSHORT) (d[0] >> 48);
+ s[1] = (unsigned EMUSHORT) (d[0] >> 32);
+ s[2] = (unsigned EMUSHORT) (d[0] >> 16);
+ s[3] = (unsigned EMUSHORT) d[0];
#endif
}
else
s[3] = (unsigned EMUSHORT) (d[0] >> 48);
#endif
}
- /* Convert target double to E-type. */
+ /* Convert target double to E-type. */
e53toe (s, e);
- /* Output E-type to REAL_VALUE_TYPE. */
+ /* Output E-type to REAL_VALUE_TYPE. */
PUT_REAL (e, &r);
return r;
}
+#if 0
/* Convert target computer unsigned 64-bit integer to e-type.
The endian-ness of DImode follows the convention for integers,
so we use WORDS_BIG_ENDIAN here, not REAL_WORDS_BIG_ENDIAN. */
static void
uditoe (di, e)
- unsigned EMUSHORT *di; /* Address of the 64-bit int. */
+ unsigned EMUSHORT *di; /* Address of the 64-bit int. */
unsigned EMUSHORT *e;
{
unsigned EMUSHORT yi[NI];
emovo (yi, e);
}
-/* Convert target computer signed 64-bit integer to e-type. */
+/* Convert target computer signed 64-bit integer to e-type. */
static void
ditoe (di, e)
- unsigned EMUSHORT *di; /* Address of the 64-bit int. */
+ unsigned EMUSHORT *di; /* Address of the 64-bit int. */
unsigned EMUSHORT *e;
{
unsigned EMULONG acc;
}
-/* Convert e-type to unsigned 64-bit int. */
+/* Convert e-type to unsigned 64-bit int. */
-static void
+static void
etoudi (x, i)
unsigned EMUSHORT *x;
unsigned EMUSHORT *i;
}
-/* Convert e-type to signed 64-bit int. */
+/* Convert e-type to signed 64-bit int. */
-static void
+static void
etodi (x, i)
unsigned EMUSHORT *x;
unsigned EMUSHORT *i;
}
-/* Longhand square root routine. */
+/* Longhand square root routine. */
static int esqinited = 0;
static unsigned short sqrndbit[NI];
-static void
+static void
esqrt (x, y)
unsigned EMUSHORT *x, *y;
{
return;
}
#endif
- /* Bring in the arg and renormalize if it is denormal. */
+ /* Bring in the arg and renormalize if it is denormal. */
emovi (x, xx);
m = (EMULONG) xx[1]; /* local long word exponent */
if (m == 0)
/* bring in next word of arg */
if (j < NE)
num[NI - 1] = xx[j + 3];
- /* Do additional bit on last outer loop, for roundoff. */
+ /* Do additional bit on last outer loop, for roundoff. */
if (nlups <= 8)
n = nlups + 1;
for (i = 0; i < n; i++)
j += 1;
}
- /* Adjust for extra, roundoff loop done. */
+ /* Adjust for extra, roundoff loop done. */
exp += (NBITS - 1) - rndprc;
- /* Sticky bit = 1 if the remainder is nonzero. */
+ /* Sticky bit = 1 if the remainder is nonzero. */
k = 0;
for (i = 3; i < NI; i++)
k |= (int) num[i];
- /* Renormalize and round off. */
+ /* Renormalize and round off. */
emdnorm (sq, k, 0, exp, 64);
emovo (sq, y);
}
+#endif
#endif /* EMU_NON_COMPILE not defined */
\f
/* Return the binary precision of the significand for a given
floating point mode. The mode can hold an integer value
that many bits wide, without losing any bits. */
-int
+unsigned int
significand_size (mode)
enum machine_mode mode;
{
switch (GET_MODE_BITSIZE (mode))
{
case 32:
+
+#if TARGET_FLOAT_FORMAT == C4X_FLOAT_FORMAT
+ return 56;
+#endif
+
return 24;
case 64:
#if TARGET_FLOAT_FORMAT == VAX_FLOAT_FORMAT
return 56;
#else
+#if TARGET_FLOAT_FORMAT == C4X_FLOAT_FORMAT
+ return 56;
+#else
abort ();
#endif
#endif
#endif
+#endif
case 96:
return 64;
+
case 128:
+#ifndef INTEL_EXTENDED_IEEE_FORMAT
return 113;
+#else
+ return 64;
+#endif
default:
abort ();
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