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re PR libstdc++/12496 (wrong result for __atomic_add(&value, -1) when using -O0 -m64) 

2003-12-08  David S. Miller  <davem@redhat.com>

	PR libstdc++/12496
	* config/cpu/sparc/atomicity.h (__exchange_and_add, __atomic_add):
	Extend increment to _Atomic_word before giving to assembler.

From-SVN: r74409
This commit is contained in:
David S. Miller 2003-12-08 02:01:01 -08:00 committed by David S. Miller
parent 0875a894be
commit 09755a8512
2 changed files with 10 additions and 2 deletions
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6
libstdc++-v3/ChangeLog
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@ -1,3 +1,9 @@
2003-12-08 David S. Miller <davem@redhat.com>
PR libstdc++/12496
* config/cpu/sparc/atomicity.h (__exchange_and_add, __atomic_add):
Extend increment to _Atomic_word before giving to assembler.
2003-12-06 Benjamin Kosnik <bkoz@redhat.com> 2003-12-06 Benjamin Kosnik <bkoz@redhat.com>
* testsuite/ext/enc_filebuf/char/13189.cc: Guard for __enc_traits. * testsuite/ext/enc_filebuf/char/13189.cc: Guard for __enc_traits.

6
libstdc++-v3/config/cpu/sparc/atomicity.h
View File

@ -39,6 +39,7 @@ __attribute__ ((__unused__))
__exchange_and_add (volatile _Atomic_word *__mem, int __val) __exchange_and_add (volatile _Atomic_word *__mem, int __val)
{ {
_Atomic_word __tmp1, __tmp2; _Atomic_word __tmp1, __tmp2;
_Atomic_word __val_extended = __val;
__asm__ __volatile__("1: ldx [%2], %0\n\t" __asm__ __volatile__("1: ldx [%2], %0\n\t"
" add %0, %3, %1\n\t" " add %0, %3, %1\n\t"
@ -47,7 +48,7 @@ __exchange_and_add (volatile _Atomic_word *__mem, int __val)
" brnz,pn %0, 1b\n\t" " brnz,pn %0, 1b\n\t"
" nop" " nop"
: "=&r" (__tmp1), "=&r" (__tmp2) : "=&r" (__tmp1), "=&r" (__tmp2)
: "r" (__mem), "r" (__val) : "r" (__mem), "r" (__val_extended)
: "memory"); : "memory");
return __tmp2; return __tmp2;
} }
@ -57,6 +58,7 @@ __attribute__ ((__unused__))
__atomic_add (volatile _Atomic_word* __mem, int __val) __atomic_add (volatile _Atomic_word* __mem, int __val)
{ {
_Atomic_word __tmp1, __tmp2; _Atomic_word __tmp1, __tmp2;
_Atomic_word __val_extended = __val;
__asm__ __volatile__("1: ldx [%2], %0\n\t" __asm__ __volatile__("1: ldx [%2], %0\n\t"
" add %0, %3, %1\n\t" " add %0, %3, %1\n\t"
@ -65,7 +67,7 @@ __atomic_add (volatile _Atomic_word* __mem, int __val)
" brnz,pn %0, 1b\n\t" " brnz,pn %0, 1b\n\t"
" nop" " nop"
: "=&r" (__tmp1), "=&r" (__tmp2) : "=&r" (__tmp1), "=&r" (__tmp2)
: "r" (__mem), "r" (__val) : "r" (__mem), "r" (__val_extended)
: "memory"); : "memory");
} }