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Implement x86 pause intrinsic.

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gcc/

2011-05-25  H.J. Lu  <hongjiu.lu@intel.com>

	* config/i386/i386.c (ix86_builtins): Add IX86_BUILTIN_PAUSE.
	(bdesc_special_args): Add pause intrinsic.

	* config/i386/i386.md (UNSPEC_PAUSE): New.
	(pause): Likewise.
	(*pause): Likewise.
	* config/i386/ia32intrin.h (__pause): Likewise.

	* doc/extend.texi (X86 Built-in Functions): Add documentation for
	pause intrinsic.

gcc/testsuite/

2011-05-25  H.J. Lu  <hongjiu.lu@intel.com>

	 * gcc.target/i386/pause-1.c: New.

From-SVN: r174197
This commit is contained in:
H.J. Lu 2011-05-25 13:42:58 +00:00 committed by H.J. Lu
parent d24ad7d6e9
commit 74838de312
7 changed files with 65 additions and 0 deletions
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13
gcc/ChangeLog
View File

@ -1,3 +1,16 @@
2011-05-25 H.J. Lu <hongjiu.lu@intel.com>
* config/i386/i386.c (ix86_builtins): Add IX86_BUILTIN_PAUSE.
(bdesc_special_args): Add pause intrinsic.
* config/i386/i386.md (UNSPEC_PAUSE): New.
(pause): Likewise.
(*pause): Likewise.
* config/i386/ia32intrin.h (__pause): Likewise.
* doc/extend.texi (X86 Built-in Functions): Add documentation for
pause intrinsic.
2011-05-25 Bill Schmidt <wschmidt@linux.vnet.ibm.com>
PR tree-optimization/46728

2
gcc/config/i386/i386.c
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@ -23912,6 +23912,7 @@ enum ix86_builtins
IX86_BUILTIN_CLFLUSH,
IX86_BUILTIN_MFENCE,
IX86_BUILTIN_LFENCE,
IX86_BUILTIN_PAUSE,
IX86_BUILTIN_BSRSI,
IX86_BUILTIN_BSRDI,
@ -24664,6 +24665,7 @@ static const struct builtin_description bdesc_special_args[] =
{
{ ~OPTION_MASK_ISA_64BIT, CODE_FOR_rdtsc, "__builtin_ia32_rdtsc", IX86_BUILTIN_RDTSC, UNKNOWN, (int) UINT64_FTYPE_VOID },
{ ~OPTION_MASK_ISA_64BIT, CODE_FOR_rdtscp, "__builtin_ia32_rdtscp", IX86_BUILTIN_RDTSCP, UNKNOWN, (int) UINT64_FTYPE_PUNSIGNED },
{ ~OPTION_MASK_ISA_64BIT, CODE_FOR_pause, "__builtin_ia32_pause", IX86_BUILTIN_PAUSE, UNKNOWN, (int) VOID_FTYPE_VOID },
/* MMX */
{ OPTION_MASK_ISA_MMX, CODE_FOR_mmx_emms, "__builtin_ia32_emms", IX86_BUILTIN_EMMS, UNKNOWN, (int) VOID_FTYPE_VOID },

20
gcc/config/i386/i386.md
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@ -108,6 +108,7 @@
UNSPEC_TRUNC_NOOP
UNSPEC_DIV_ALREADY_SPLIT
UNSPEC_CALL_NEEDS_VZEROUPPER
UNSPEC_PAUSE
;; For SSE/MMX support:
UNSPEC_FIX_NOTRUNC
@ -17716,6 +17717,25 @@
[(set_attr "type" "other")
(set_attr "prefix_extra" "1")])
(define_expand "pause"
[(set (match_dup 0)
(unspec:BLK [(match_dup 0)] UNSPEC_PAUSE))]
""
{
operands[0] = gen_rtx_MEM (BLKmode, gen_rtx_SCRATCH (Pmode));
MEM_VOLATILE_P (operands[0]) = 1;
})
;; Use "rep; nop", instead of "pause", to support older assemblers.
;; They have the same encoding.
(define_insn "*pause"
[(set (match_operand:BLK 0 "" "")
(unspec:BLK [(match_dup 0)] UNSPEC_PAUSE))]
""
"rep; nop"
[(set_attr "length" "2")
(set_attr "memory" "unknown")])
(include "mmx.md")
(include "sse.md")
(include "sync.md")

8
gcc/config/i386/ia32intrin.h
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@ -153,6 +153,14 @@ __rord (unsigned int __X, int __C)
return (__X >> __C) | (__X << (32 - __C));
}
/* Pause */
extern __inline void
__attribute__((__gnu_inline__, __always_inline__, __artificial__))
__pause (void)
{
__builtin_ia32_pause ();
}
#ifdef __x86_64__
/* 64bit bsf */
extern __inline int

7
gcc/doc/extend.texi
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@ -8695,6 +8695,13 @@ __float128 __builtin_fabsq (__float128)
__float128 __builtin_copysignq (__float128, __float128)
@end smallexample
The following built-in function is always available.
@table @code
@item void __builtin_ia32_pause (void)
Generates the @code{pause} machine instruction with full memory barrier.
@end table
The following floating point built-in functions are made available in the
64-bit mode.

4
gcc/testsuite/ChangeLog
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@ -1,3 +1,7 @@
2011-05-25 H.J. Lu <hongjiu.lu@intel.com>
* gcc.target/i386/pause-1.c: New.
2011-05-25 Eric Botcazou <ebotcazou@adacore.com>
* gcc.dg/stack-usage-1.c: Adjust comment.

11
gcc/testsuite/gcc.target/i386/pause-1.c Normal file
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@ -0,0 +1,11 @@
/* Test that we generate pause instruction. */
/* { dg-do compile } */
/* { dg-options "-O2 -dp" } */
/* { dg-final { scan-assembler-times "\\*pause" 1 } } */
#include <x86intrin.h>
void foo(void)
{
__pause();
}