https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115891
Richard Sandiford <rsandifo at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Ever confirmed|0 |1
Last reconfirmed| |2024-07-12
Assignee|unassigned at gcc dot gnu.org |rsandifo at gcc dot
gnu.org
Status|UNCONFIRMED |ASSIGNED
--- Comment #3 from Richard Sandiford <rsandifo at gcc dot gnu.org> ---
Comes from:
trying to combine definition of r5 in:
1058: di:SI=ax:SI
into:
299: {[di:SI]=asm_operands;clobber ax:SI;clobber flags:CC;}
successfully matched this instruction:
(parallel [
(set (mem:SI (reg:SI 0 ax [520]) [2 *_3+0 S4 A32])
(asm_operands/v:SI ("movd %%xmm0, %%eax
bswapl %%eax
movl %%eax, %0
") ("=m") 0 []
[]
[] ../cipher/crc-intel-pclmul.c:781))
(clobber (reg:SI 0 ax))
(clobber (reg:CC 17 flags))
])
original cost = 4 + 4 (weighted: 0.090837), replacement cost = 4 (weighted:
0.045419); keeping replacement
which ought to be prevented by the clobber, but for some reason isn't.
