AuroraMiddleware/glibc
1
0
Fork 0
mirror of https://sourceware.org/git/glibc.git synced 2024-11-10 07:10:06 +00:00
Code Issues Packages Projects Releases Wiki Activity

Disable GCC 5 optimization when PROF is defined

Browse Source 
Since asm ("ebp") can't be used to put the 6th argument in %ebp for
syscall when compiling for profiling, we disable GCC 5 optimization
when PROF is defined.

	* sysdeps/unix/sysv/linux/i386/sysdep.h (OPTIMIZE_FOR_GCC_5):
	New.  Defined for GCC 5 and above when not compiling for
	profiling.
	Replace __GNUC_PREREQ (5,0) with OPTIMIZE_FOR_GCC_5.
This commit is contained in:
H.J. Lu 2015-10-21 09:07:46 -07:00
parent d8f7fcacd7
commit 23c4baa214
2 changed files with 18 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
ChangeLog
View File

@ -1,5 +1,10 @@
2015-10-21 H.J. Lu <hongjiu.lu@intel.com>
* sysdeps/unix/sysv/linux/i386/sysdep.h (OPTIMIZE_FOR_GCC_5):
New. Defined for GCC 5 and above when not compiling for
profiling.
Replace __GNUC_PREREQ (5,0) with OPTIMIZE_FOR_GCC_5.
* sysdeps/unix/sysv/linux/i386/Makefile (CFLAGS-epoll_pwait.c):
Renamed to ...
(CFLAGS-epoll_pwait.o): This.

20
sysdeps/unix/sysv/linux/i386/sysdep.h
View File

@ -229,9 +229,15 @@ extern int __syscall_error (int)
/* Since GCC 5 and above can properly spill %ebx with PIC when needed,
we can inline syscalls with 6 arguments if GCC 5 or above is used
to compile glibc. */
to compile glibc. Disable GCC 5 optimization when compiling for
profiling since asm ("ebp") can't be used to put the 6th argument
in %ebp for syscall. */
#if !__GNUC_PREREQ (5,0)
#if __GNUC_PREREQ (5,0) && !defined PROF
# define OPTIMIZE_FOR_GCC_5
#endif
#ifndef OPTIMIZE_FOR_GCC_5
/* We need some help from the assembler to generate optimal code. We
define some macros here which later will be used. */
asm (".L__X'%ebx = 1\n\t"
@ -328,7 +334,7 @@ struct libc_do_syscall_args
INTERNAL_SYSCALL_MAIN_INLINE(name, err, 5, args)
/* Each object using 6-argument inline syscalls must include a
definition of __libc_do_syscall. */
#if __GNUC_PREREQ (5,0)
#ifdef OPTIMIZE_FOR_GCC_5
# define INTERNAL_SYSCALL_MAIN_6(name, err, args...) \
INTERNAL_SYSCALL_MAIN_INLINE(name, err, 6, args)
#else /* GCC 5 */
@ -353,7 +359,7 @@ struct libc_do_syscall_args
INTERNAL_SYSCALL_MAIN_##nr (name, err, args); \
(int) resultvar; })
#ifdef I386_USE_SYSENTER
# if __GNUC_PREREQ (5,0)
# ifdef OPTIMIZE_FOR_GCC_5
# ifdef SHARED
# define INTERNAL_SYSCALL_MAIN_INLINE(name, err, nr, args...) \
LOADREGS_##nr(args) \
@ -437,7 +443,7 @@ struct libc_do_syscall_args
# endif
# endif /* GCC 5 */
#else
# if __GNUC_PREREQ (5,0)
# ifdef OPTIMIZE_FOR_GCC_5
# define INTERNAL_SYSCALL_MAIN_INLINE(name, err, nr, args...) \
LOADREGS_##nr(args) \
asm volatile ( \
@ -539,7 +545,7 @@ struct libc_do_syscall_args
# define RESTOREARGS_5
#endif
#if __GNUC_PREREQ (5,0)
#ifdef OPTIMIZE_FOR_GCC_5
# define LOADREGS_0()
# define ASMARGS_0()
# define LOADREGS_1(arg1) \
@ -606,7 +612,7 @@ struct libc_do_syscall_args
#endif
/* Consistency check for position-independent code. */
#if defined __PIC__ && !__GNUC_PREREQ (5,0)
#if defined __PIC__ && !defined OPTIMIZE_FOR_GCC_5
# define check_consistency() \
({ int __res; \
__asm__ __volatile__ \