The _cas code in `atomic.nim` for `tcc` of windows is disabled.
elif defined(tcc) and not defined(windows):
when defined(amd64):
{.emit:"""
static int __tcc_cas(int *ptr, int oldVal, int newVal)
{
unsigned char ret;
__asm__ __volatile__ (
" lock\n"
" cmpxchgq %2,%1\n"
" sete %0\n"
: "=q" (ret), "=m" (*ptr)
: "r" (newVal), "m" (*ptr), "a" (oldVal)
: "memory");
if (ret)
return 0;
else
return 1;
}
""".}
else:
assert sizeof(int) == 4
{.emit:"""
static int __tcc_cas(int *ptr, int oldVal, int newVal)
{
unsigned char ret;
__asm__ __volatile__ (
" lock\n"
" cmpxchgl %2,%1\n"
" sete %0\n"
: "=q" (ret), "=m" (*ptr)
: "r" (newVal), "m" (*ptr), "a" (oldVal)
: "memory");
if (ret)
return 0;
else
return 1;
}
""".}
proc tcc_cas(p: ptr int; oldValue, newValue: int): bool
{.importc: "__tcc_cas", nodecl.}
The code seems fine, is there any potential problem with the code in windows?
