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gcc/
[pf3gnuchains/gcc-fork.git] / libgcc / config / i386 / 64 / sfp-machine.h
1 #define _FP_W_TYPE_SIZE         64
2 #define _FP_W_TYPE              unsigned long
3 #define _FP_WS_TYPE             signed long
4 #define _FP_I_TYPE              long
5
6 typedef int TItype __attribute__ ((mode (TI)));
7 typedef unsigned int UTItype __attribute__ ((mode (TI)));
8
9 #define TI_BITS (__CHAR_BIT__ * (int)sizeof(TItype))
10
11 /* The type of the result of a floating point comparison.  This must
12    match `__libgcc_cmp_return__' in GCC for the target.  */
13 typedef int __gcc_CMPtype __attribute__ ((mode (__libgcc_cmp_return__)));
14 #define CMPtype __gcc_CMPtype
15
16 #define _FP_MUL_MEAT_Q(R,X,Y)                           \
17   _FP_MUL_MEAT_2_wide(_FP_WFRACBITS_Q,R,X,Y,umul_ppmm)
18
19 #define _FP_DIV_MEAT_Q(R,X,Y)   _FP_DIV_MEAT_2_udiv(Q,R,X,Y)
20
21 #define _FP_NANFRAC_S           _FP_QNANBIT_S
22 #define _FP_NANFRAC_D           _FP_QNANBIT_D
23 #define _FP_NANFRAC_E           _FP_QNANBIT_E, 0
24 #define _FP_NANFRAC_Q           _FP_QNANBIT_Q, 0
25 #define _FP_NANSIGN_S           1
26 #define _FP_NANSIGN_D           1
27 #define _FP_NANSIGN_E           1
28 #define _FP_NANSIGN_Q           1
29
30 #define _FP_KEEPNANFRACP 1
31
32 /* Here is something Intel misdesigned: the specs don't define
33    the case where we have two NaNs with same mantissas, but
34    different sign. Different operations pick up different NaNs.  */
35 #define _FP_CHOOSENAN(fs, wc, R, X, Y, OP)                      \
36   do {                                                          \
37     if (_FP_FRAC_GT_##wc(X, Y)                                  \
38         || (_FP_FRAC_EQ_##wc(X,Y) && (OP == '+' || OP == '*'))) \
39       {                                                         \
40         R##_s = X##_s;                                          \
41         _FP_FRAC_COPY_##wc(R,X);                                \
42       }                                                         \
43     else                                                        \
44       {                                                         \
45         R##_s = Y##_s;                                          \
46         _FP_FRAC_COPY_##wc(R,Y);                                \
47       }                                                         \
48     R##_c = FP_CLS_NAN;                                         \
49   } while (0)
50
51 #define FP_EX_INVALID           0x01
52 #define FP_EX_DENORM            0x02
53 #define FP_EX_DIVZERO           0x04
54 #define FP_EX_OVERFLOW          0x08
55 #define FP_EX_UNDERFLOW         0x10
56 #define FP_EX_INEXACT           0x20
57
58 struct fenv
59 {
60   unsigned short int __control_word;
61   unsigned short int __unused1;
62   unsigned short int __status_word;
63   unsigned short int __unused2;
64   unsigned short int __tags;
65   unsigned short int __unused3;
66   unsigned int __eip;
67   unsigned short int __cs_selector;
68   unsigned int __opcode:11;
69   unsigned int __unused4:5;
70   unsigned int __data_offset;
71   unsigned short int __data_selector;
72   unsigned short int __unused5;
73 };
74
75 #define FP_HANDLE_EXCEPTIONS                                            \
76   do {                                                                  \
77     if (_fex & FP_EX_INVALID)                                           \
78       {                                                                 \
79         float f = 0.0;                                                  \
80         __asm__ __volatile__ ("divss %0, %0 " : : "x" (f));             \
81       }                                                                 \
82     if (_fex & FP_EX_DIVZERO)                                           \
83       {                                                                 \
84         float f = 1.0, g = 0.0;                                         \
85         __asm__ __volatile__ ("divss %1, %0" : : "x" (f), "x" (g));     \
86       }                                                                 \
87     if (_fex & FP_EX_OVERFLOW)                                          \
88       {                                                                 \
89         struct fenv temp;                                               \
90         __asm__ __volatile__ ("fnstenv %0" : "=m" (temp));              \
91         temp.__status_word |= FP_EX_OVERFLOW;                           \
92         __asm__ __volatile__ ("fldenv %0" : : "m" (temp));              \
93         __asm__ __volatile__ ("fwait");                                 \
94       }                                                                 \
95     if (_fex & FP_EX_UNDERFLOW)                                         \
96       {                                                                 \
97         struct fenv temp;                                               \
98         __asm__ __volatile__ ("fnstenv %0" : "=m" (temp));              \
99         temp.__status_word |= FP_EX_UNDERFLOW;                          \
100         __asm__ __volatile__ ("fldenv %0" : : "m" (temp));              \
101         __asm__ __volatile__ ("fwait");                                 \
102       }                                                                 \
103     if (_fex & FP_EX_INEXACT)                                           \
104       {                                                                 \
105         struct fenv temp;                                               \
106         __asm__ __volatile__ ("fnstenv %0" : "=m" (temp));              \
107         temp.__status_word |= FP_EX_INEXACT;                            \
108         __asm__ __volatile__ ("fldenv %0" : : "m" (temp));              \
109         __asm__ __volatile__ ("fwait");                                 \
110       }                                                                 \
111   } while (0)
112
113 #define FP_RND_NEAREST          0
114 #define FP_RND_ZERO             0xc00
115 #define FP_RND_PINF             0x800
116 #define FP_RND_MINF             0x400
117
118 #define _FP_DECL_EX \
119   unsigned short _fcw __attribute__ ((unused)) = FP_RND_NEAREST
120
121 #define FP_INIT_ROUNDMODE                       \
122   do {                                          \
123     __asm__ ("fnstcw %0" : "=m" (_fcw));        \
124   } while (0)
125
126 #define FP_ROUNDMODE            (_fcw & 0xc00)
127
128 #define __LITTLE_ENDIAN 1234
129 #define __BIG_ENDIAN    4321
130
131 #define __BYTE_ORDER __LITTLE_ENDIAN
132
133 /* Define ALIASNAME as a strong alias for NAME.  */
134 #if defined __MACH__
135 /* Mach-O doesn't support aliasing.  If these functions ever return
136    anything but CMPtype we need to revisit this... */
137 #define strong_alias(name, aliasname) \
138   CMPtype aliasname (TFtype a, TFtype b) { return name(a, b); }
139 #else
140 # define strong_alias(name, aliasname) _strong_alias(name, aliasname)
141 # define _strong_alias(name, aliasname) \
142   extern __typeof (name) aliasname __attribute__ ((alias (#name)));
143 #endif