> The conversion of the __sync post-reload splitters was half
> complete. Since there are nearly no restrictions on what may
> appear between LL and SC, expand all the patterns immediatly.
> This allows significantly easier code generation for subword
> atomic operations.
On PowerPC/Linux, for:
typedef __UINT64_TYPE__ uint64_t;
uint64_t load (uint64_t *loc)
{
return __atomic_load_8 (loc, __ATOMIC_SEQ_CST);
}
the 4.7 compiler generates at -O:
load:
sync
lwz 10,0(3)
lwz 11,4(3)
cmpw 7,10,10
bne- 7,$+4
isync
mr 3,10
mr 4,11
blr
Is that really an atomic load?
--
Eric Botcazou
