cmpxchgl on x86?
cmpxchgl on x86?
- Subject: cmpxchgl on x86?
- From: Andrew Gallatin <email@hidden>
- Date: Thu, 23 Jun 2005 13:11:30 -0400 (EDT)
I'm trying to compile a unix command-line program on Darwin 8.0 x86,
and I'm hitting this problem:
/var/tmp/cczbJSUe.s:1993:Can't relocate expression. Absolute 0 assumed.
/var/tmp/cczbJSUe.s:1993:operands given don't match any known 386 instruction
The code in it is complaining about is an inline cmpxchgl asm routine:
static inline uint32_t my__cmpswap_u32(uint32_t *ptr, uint32_t old, uint32_t new)
{
asm volatile("lock cmpxchgl %1,%2" : "=a" (old) : "q" (new), "m" (*ptr),"0" (old) : "memory");
return old;
}
This seems to happen with both gcc-4.0 and gcc-3.3
Can somebody tell me what I'm doing wrong, please?
I realize that cmpxchgl is not in the 386abi, but I'm using a P4.
I've passed -march=pentium to gcc, but to no avail. I've even tried
saving the assembler to a temporary file and running:
/usr/libexec/gcc/darwin/i386/as -arch pentium foo.s
but it still complains.
Thanks,
Drew
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