/* This file contains the definitions and documentation for the
Register Transfer Expressions (rtx's) that make up the
Register Transfer Language (rtl) used in the Back End of the GNU compiler.
- Copyright (C) 1987, 1988, 1992, 1994, 1995, 1997, 1998, 1999, 2000, 2004
+ Copyright (C) 1987, 1988, 1992, 1994, 1995, 1997, 1998, 1999, 2000, 2004,
+ 2005
Free Software Foundation, Inc.
This file is part of GCC.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING. If not, write to the Free
-Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-02111-1307, USA. */
+Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301, USA. */
/* Expression definitions and descriptions for all targets are in this file.
DEF_RTL_EXPR(CONST_DOUBLE, "const_double", CONST_DOUBLE_FORMAT, RTX_CONST_OBJ)
/* Describes a vector constant. */
-DEF_RTL_EXPR(CONST_VECTOR, "const_vector", "E", RTX_EXTRA)
+DEF_RTL_EXPR(CONST_VECTOR, "const_vector", "E", RTX_CONST_OBJ)
/* String constant. Used for attributes in machine descriptions and
for special cases in DWARF2 debug output. NOT used for source-
by a SET whose first operand is (PC). */
DEF_RTL_EXPR(PC, "pc", "", RTX_OBJ)
-/* Used in the cselib routines to describe a value. */
+/* Used in the cselib routines to describe a value. Objects of this
+ kind are only allocated in cselib.c, in an alloc pool instead of
+ in GC memory. The only operand of a VALUE is a cselib_val_struct. */
DEF_RTL_EXPR(VALUE, "value", "0", RTX_OBJ)
/* A register. The "operand" is the register number, accessed with
the REGNO macro. If this number is less than FIRST_PSEUDO_REGISTER
than a hardware register is being referred to. The second operand
holds the original register number - this will be different for a
- pseudo register that got turned into a hard register.
+ pseudo register that got turned into a hard register. The third
+ operand points to a reg_attrs structure.
This rtx needs to have as many (or more) fields as a MEM, since we
can change REG rtx's into MEMs during reload. */
DEF_RTL_EXPR(REG, "reg", "i00", RTX_OBJ)
/* Reference to an assembler label in the code for this function.
The operand is a CODE_LABEL found in the insn chain.
- The unprinted fields 1 and 2 are used in flow.c for the
- LABEL_NEXTREF and CONTAINING_INSN. */
-DEF_RTL_EXPR(LABEL_REF, "label_ref", "u00", RTX_CONST_OBJ)
+ The unprinted field 1 is used in flow.c for the LABEL_NEXTREF. */
+DEF_RTL_EXPR(LABEL_REF, "label_ref", "u0", RTX_CONST_OBJ)
/* Reference to a named label:
Operand 0: label name
/* Bitwise operations. */
DEF_RTL_EXPR(AND, "and", "ee", RTX_COMM_ARITH)
-
DEF_RTL_EXPR(IOR, "ior", "ee", RTX_COMM_ARITH)
-
DEF_RTL_EXPR(XOR, "xor", "ee", RTX_COMM_ARITH)
-
DEF_RTL_EXPR(NOT, "not", "e", RTX_UNARY)
/* Operand:
/* Minimum and maximum values of two operands. We need both signed and
unsigned forms. (We cannot use MIN for SMIN because it conflicts
- with a macro of the same name.) */
+ with a macro of the same name.) The signed variants should be used
+ with floating point. Further, if both operands are zeros, or if either
+ operand is NaN, then it is unspecified which of the two operands is
+ returned as the result. */
DEF_RTL_EXPR(SMIN, "smin", "ee", RTX_COMM_ARITH)
DEF_RTL_EXPR(SMAX, "smax", "ee", RTX_COMM_ARITH)
If BITS_BIG_ENDIAN is defined, the first bit is the msb and
operand 2 counts from the msb of the memory unit.
Otherwise, the first bit is the lsb and operand 2 counts from
- the lsb of the memory unit. */
+ the lsb of the memory unit.
+ This kind of expression can not appear as an lvalue in RTL. */
DEF_RTL_EXPR(SIGN_EXTRACT, "sign_extract", "eee", RTX_BITFIELD_OPS)
-/* Similar for unsigned bit-field. */
+/* Similar for unsigned bit-field.
+ But note! This kind of expression _can_ appear as an lvalue. */
DEF_RTL_EXPR(ZERO_EXTRACT, "zero_extract", "eee", RTX_BITFIELD_OPS)
/* For RISC machines. These save memory when splitting insns. */
of a constant expression. */
DEF_RTL_EXPR(LO_SUM, "lo_sum", "ee", RTX_OBJ)
-/* Header for range information. Operand 0 is the NOTE_INSN_RANGE_BEG insn.
- Operand 1 is the NOTE_INSN_RANGE_END insn. Operand 2 is a vector of all of
- the registers that can be substituted within this range. Operand 3 is the
- number of calls in the range. Operand 4 is the number of insns in the
- range. Operand 5 is the unique range number for this range. Operand 6 is
- the basic block # of the start of the live range. Operand 7 is the basic
- block # of the end of the live range. Operand 8 is the loop depth. Operand
- 9 is a bitmap of the registers live at the start of the range. Operand 10
- is a bitmap of the registers live at the end of the range. Operand 11 is
- marker number for the start of the range. Operand 12 is the marker number
- for the end of the range. */
-DEF_RTL_EXPR(RANGE_INFO, "range_info", "uuEiiiiiibbii", RTX_EXTRA)
-
-/* Registers that can be substituted within the range. Operand 0 is the
- original pseudo register number. Operand 1 will be filled in with the
- pseudo register the value is copied for the duration of the range. Operand
- 2 is the number of references within the range to the register. Operand 3
- is the number of sets or clobbers of the register in the range. Operand 4
- is the number of deaths the register has. Operand 5 is the copy flags that
- give the status of whether a copy is needed from the original register to
- the new register at the beginning of the range, or whether a copy from the
- new register back to the original at the end of the range. Operand 6 is the
- live length. Operand 7 is the number of calls that this register is live
- across. Operand 8 is the symbol node of the variable if the register is a
- user variable. Operand 9 is the block node that the variable is declared
- in if the register is a user variable. */
-DEF_RTL_EXPR(RANGE_REG, "range_reg", "iiiiiiiitt", RTX_EXTRA)
-
-/* Information about a local variable's ranges. Operand 0 is an EXPR_LIST of
- the different ranges a variable is in where it is copied to a different
- pseudo register. Operand 1 is the block that the variable is declared in.
- Operand 2 is the number of distinct ranges. */
-DEF_RTL_EXPR(RANGE_VAR, "range_var", "eti", RTX_EXTRA)
-
-/* Information about the registers that are live at the current point. Operand
- 0 is the live bitmap. Operand 1 is the original block number. */
-DEF_RTL_EXPR(RANGE_LIVE, "range_live", "bi", RTX_EXTRA)
-
/* Describes a merge operation between two vector values.
Operands 0 and 1 are the vectors to be merged, operand 2 is a bitmask
that specifies where the parts of the result are taken from. Set bits
OSDN Git Service
