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x86: Use RTM intrinsics in pthread mutex lock elision

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Since RTM intrinsics are supported in GCC 4.9, we can use them in
pthread mutex lock elision.

	* sysdeps/unix/sysv/linux/x86/Makefile (CFLAGS-elision-lock.c):
	Add -mrtm.
	(CFLAGS-elision-unlock.c): Likewise.
	(CFLAGS-elision-timed.c): Likewise.
	(CFLAGS-elision-trylock.c): Likewise.
	* sysdeps/unix/sysv/linux/x86/hle.h: Rewritten.
This commit is contained in:
H.J. Lu 2018-10-02 07:51:48 -07:00
parent 0b727ed4d6
commit a1ccc0654b
3 changed files with 16 additions and 67 deletions
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9
ChangeLog
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@ -1,3 +1,12 @@
2018-10-02 H.J. Lu <hongjiu.lu@intel.com>
* sysdeps/unix/sysv/linux/x86/Makefile (CFLAGS-elision-lock.c):
Add -mrtm.
(CFLAGS-elision-unlock.c): Likewise.
(CFLAGS-elision-timed.c): Likewise.
(CFLAGS-elision-trylock.c): Likewise.
* sysdeps/unix/sysv/linux/x86/hle.h: Rewritten.
2018-10-02 Adhemerval Zanella <adhemerval.zanella@linaro.org>
[BZ #21037]

4
sysdeps/unix/sysv/linux/x86/Makefile
View File

@ -14,6 +14,10 @@ endif
ifeq ($(subdir),nptl)
libpthread-sysdep_routines += elision-lock elision-unlock elision-timed \
elision-trylock
CFLAGS-elision-lock.c += -mrtm
CFLAGS-elision-unlock.c += -mrtm
CFLAGS-elision-timed.c += -mrtm
CFLAGS-elision-trylock.c += -mrtm
endif
ifeq ($(subdir),elf)

68
sysdeps/unix/sysv/linux/x86/hle.h
View File

@ -1,75 +1,11 @@
/* Shared RTM header. Emulate TSX intrinsics for compilers and assemblers
that do not support the intrinsics and instructions yet. */
/* Shared RTM header. */
#ifndef _HLE_H
#define _HLE_H 1
#ifdef __ASSEMBLER__
.macro XBEGIN target
.byte 0xc7,0xf8
.long \target-1f
1:
.endm
.macro XEND
.byte 0x0f,0x01,0xd5
.endm
.macro XABORT code
.byte 0xc6,0xf8,\code
.endm
.macro XTEST
.byte 0x0f,0x01,0xd6
.endm
#endif
/* Official RTM intrinsics interface matching gcc/icc, but works
on older gcc compatible compilers and binutils.
We should somehow detect if the compiler supports it, because
it may be able to generate slightly better code. */
#define _XBEGIN_STARTED (~0u)
#define _XABORT_EXPLICIT (1 << 0)
#define _XABORT_RETRY (1 << 1)
#define _XABORT_CONFLICT (1 << 2)
#define _XABORT_CAPACITY (1 << 3)
#define _XABORT_DEBUG (1 << 4)
#define _XABORT_NESTED (1 << 5)
#define _XABORT_CODE(x) (((x) >> 24) & 0xff)
#include <x86intrin.h>
#define _ABORT_LOCK_BUSY 0xff
#define _ABORT_LOCK_IS_LOCKED 0xfe
#define _ABORT_NESTED_TRYLOCK 0xfd
#ifndef __ASSEMBLER__
#define __force_inline __attribute__((__always_inline__)) inline
static __force_inline int _xbegin(void)
{
int ret = _XBEGIN_STARTED;
asm volatile (".byte 0xc7,0xf8 ; .long 0" : "+a" (ret) :: "memory");
return ret;
}
static __force_inline void _xend(void)
{
asm volatile (".byte 0x0f,0x01,0xd5" ::: "memory");
}
static __force_inline void _xabort(const unsigned int status)
{
asm volatile (".byte 0xc6,0xf8,%P0" :: "i" (status) : "memory");
}
static __force_inline int _xtest(void)
{
unsigned char out;
asm volatile (".byte 0x0f,0x01,0xd6 ; setnz %0" : "=r" (out) :: "memory");
return out;
}
#endif
#endif