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Another attempt to improve atomic inc/dec

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git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@33119 72102866-910b-0410-8b05-ffd578937521
This commit is contained in:
rfm 2011-05-25 22:18:39 +00:00
parent e4e38170f9
commit 957ee2b8ef
2 changed files with 15 additions and 35 deletions
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44
Source/NSObject.m
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@ -214,8 +214,8 @@ typedef int32_t volatile *gsatomic_t;
typedef int32_t volatile *gsatomic_t;
#define GSATOMICREAD(X) (*(X))
#define GSAtomicIncrement(X) __sync_fetch_and_add(X, 1)
#define GSAtomicDecrement(X) __sync_fetch_and_sub(X, 1)
#define GSAtomicIncrement(X) __sync_add_and_fetch(X, 1)
#define GSAtomicDecrement(X) __sync_sub_and_fetch(X, 1)
#elif defined(__linux__) && (defined(__i386__) || defined(__x86_64__))
@ -228,18 +228,17 @@ typedef int32_t volatile *gsatomic_t;
#define ATOMIC_TESTING 1
#if defined(ATOMIC_TESTING)
static __inline__ int
GSAtomicIncrement(gsatomic_t X)
{
register int tmp;
__asm__ __volatile__ (
"movl $1, %0\n\t"
"movl $1, %0\n"
"lock xaddl %0, %1"
:"=r" (tmp), "=m" (*X)
:"r" (tmp), "m" (*X)
:"memory" );
return tmp;
return tmp + 1;
}
static __inline__ int
@ -247,35 +246,14 @@ GSAtomicDecrement(gsatomic_t X)
{
register int tmp;
__asm__ __volatile__ (
"movl $1, %0\n\t"
"negl %0\n\t"
"movl $1, %0\n"
"negl %0\n"
"lock xaddl %0, %1"
:"=r" (tmp), "=m" (*X)
:"r" (tmp), "m" (*X)
:"memory" );
return tmp;
return tmp - 1;
}
#else
static __inline__ int
GSAtomicIncrement(gsatomic_t X)
{
__asm__ __volatile__ (
"lock addl $1, %0"
:"=m" (*X));
return *X;
}
static __inline__ int
GSAtomicDecrement(gsatomic_t X)
{
__asm__ __volatile__ (
"lock subl $1, %0"
:"=m" (*X));
return *X;
}
#endif
#elif defined(__PPC__) || defined(__POWERPC__)
@ -296,7 +274,7 @@ GSAtomicIncrement(gsatomic_t X)
:"=&r" (tmp)
:"r" (X)
:"cc", "memory");
return *X;
return tmp;
}
static __inline__ int
@ -312,7 +290,7 @@ GSAtomicDecrement(gsatomic_t X)
:"=&r" (tmp)
:"r" (X)
:"cc", "memory");
return *X;
return tmp;
}
#elif defined(__m68k__)
@ -359,7 +337,7 @@ GSAtomicIncrement(gsatomic_t X)
" sc %0, %1 \n"
" beqz %0, 0b \n"
:"=&r" (tmp), "=m" (*X));
return *X;
return tmp;
}
static __inline__ int
@ -376,7 +354,7 @@ GSAtomicDecrement(gsatomic_t X)
" sc %0, %1 \n"
" beqz %0, 0b \n"
:"=&r" (tmp), "=m" (*X));
return *X;
return tmp;
}
#endif