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Update atomic increment/decrement

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git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@26369 72102866-910b-0410-8b05-ffd578937521
This commit is contained in:
Richard Frith-MacDonald 2008-03-20 14:47:08 +00:00
parent aeabafcf12
commit 0dca6da5fb
2 changed files with 53 additions and 14 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2008-03-20 David Chisnall <csdavec@swansea.ac.uk
* Source/NSObject.m: Changed atomic increment/decrement for intel
to simpler (perhaps marginally faster) code, also added atomic
increment/decrement for PPC.
2008-03-20 Richard Frith-Macdonald <rfm@gnu.org>
* Source/win32/GSRunLoopCtxt.m: Fix bad function call (bug #22676)

61
Source/NSObject.m
View file

@ -230,7 +230,7 @@ typedef int32_t volatile *gsatomic_t;
#endif
#if defined(__linux__) && (defined(__i386__) || defined(__x86_64__))
#elif defined(__linux__) && (defined(__i386__) || defined(__x86_64__))
/* Set up atomic read, increment and decrement for intel style linux
*/
@ -241,26 +241,59 @@ typedef int32_t volatile *gsatomic_t;
static __inline__ int
GSAtomicIncrement(gsatomic_t X)
{
int i = 1;
__asm__ __volatile__(
"lock ; xaddl %0, %1;"
:"=r"(i)
:"m"(*X), "0"(i));
return i + 1;
__asm__ __volatile__ (
"lock addl $1, %0"
:"=m" (*X));
return *X;
}
static __inline__ int
GSAtomicDecrement(gsatomic_t X)
{
int i = -1;
__asm__ __volatile__(
"lock ; xaddl %0, %1;"
:"=r"(i)
:"m"(*X), "0"(i));
return i - 1;
__asm__ __volatile__ (
"lock subl $1, %0"
:"=m" (*X));
return *X;
}
#elif defined(__PPC__)
typedef int32_t volatile *gsatomic_t;
#define GSATOMICREAD(X) (*(X))
static __inline__ int
GSAtomicIncrement(gsatomic_t X)
{
int tmp;
__asm__ __volatile__ (
"modified:"
"lwarx %0,0,%1 \n"
"addic %0,%0,1 \n"
"stwcx. %0,0,%1 \n"
"bne- modified \n"
:"=&r" (tmp)
:"r" (X)
:"cc", "memory");
return *X;
}
static __inline__ int
GSAtomicDecrement(gsatomic_t X)
{
int tmp;
__asm__ __volatile__ (
"modified:"
"lwarx %0,0,%1 \n"
"addic %0,%0,-1 \n"
"stwcx. %0,0,%1 \n"
"bne- modified \n"
:"=&r" (tmp)
:"r" (X)
:"cc", "memory");
return *X;
}
#endif
#endif
#if defined(REFCNT_LOCAL) && !defined(GSATOMICREAD)