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libgcc: Fix __gthr_i486_lock_cmp_xchg clobber for Windows 

2022-01-14  David  <gccbugzilla@limegreensocks.com>

libgcc/
	* config/i386/gthr-win32.c (__gthr_i486_lock_cmp_xchg):
	Remove inlined version, Windows 95 is no longer relevant.
	* config/i386/gthr-win32.h
	(__GTHREAD_I486_INLINE_LOCK_PRIMITIVES): unset.
This commit is contained in:
Jonathan Yong 2022-01-15 13:24:33 +00:00
parent 617db51d7e
commit dcf8fe1eea
2 changed files with 2 additions and 23 deletions
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2
libgcc/config/i386/gthr-win32.c
View File

@ -31,8 +31,6 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
#ifndef __GTHREAD_HIDE_WIN32API
# define __GTHREAD_HIDE_WIN32API 1
#endif
#undef __GTHREAD_I486_INLINE_LOCK_PRIMITIVES
#define __GTHREAD_I486_INLINE_LOCK_PRIMITIVES
#include "gthr-win32.h"
/* Windows32 threads specific definitions. The windows32 threading model

23
libgcc/config/i386/gthr-win32.h
View File

@ -374,28 +374,9 @@ extern int _CRT_MT;
extern int __mingwthr_key_dtor (unsigned long, void (*) (void *));
#endif /* _WIN32 && !__CYGWIN__ */
/* The Windows95 kernel does not export InterlockedCompareExchange.
This provides a substitute. When building apps that reference
gthread_mutex_try_lock, the __GTHREAD_I486_INLINE_LOCK_PRIMITIVES
macro must be defined if Windows95 is a target. Currently
gthread_mutex_try_lock is not referenced by libgcc or libstdc++. */
#ifdef __GTHREAD_I486_INLINE_LOCK_PRIMITIVES
static inline long
__gthr_i486_lock_cmp_xchg(long *__dest, long __xchg, long __comperand)
{
long result;
__asm__ __volatile__ ("\n\
lock\n\
cmpxchg{l} {%4, %1|%1, %4}\n"
: "=a" (result), "=m" (*__dest)
: "0" (__comperand), "m" (*__dest), "r" (__xchg)
: "cc");
return result;
}
#define __GTHR_W32_InterlockedCompareExchange __gthr_i486_lock_cmp_xchg
#else /* __GTHREAD_I486_INLINE_LOCK_PRIMITIVES */
/* __GTHR_W32_InterlockedCompareExchange is left over from win95,
which did not support InterlockedCompareExchange. */
#define __GTHR_W32_InterlockedCompareExchange InterlockedCompareExchange
#endif /* __GTHREAD_I486_INLINE_LOCK_PRIMITIVES */
static inline int
__gthread_active_p (void)