https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96654
Bug ID: 96654
Summary: Failure to optimize vectorized conversion to `int`
with AVX
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: gabravier at gmail dot com
Target Milestone: ---
void f(double *src, int *dst)
{
for (int i = 0; i < 4; i ++)
dst[i] = (int)src[i];
}
With -O3 -mavx, LLVM outputs this :
f(double*, int*):
vcvttpd2dq xmm0, ymmword ptr [rdi]
vmovupd xmmword ptr [rsi], xmm0
ret
GCC outputs this :
f(double*, int*):
push rbp
vmovupd xmm1, XMMWORD PTR [rdi]
vinsertf128 ymm0, ymm1, XMMWORD PTR [rdi+16], 0x1
mov rbp, rsp
vcvttpd2dq xmm0, ymm0
vmovdqu XMMWORD PTR [rsi], xmm0
vzeroupper
pop rbp
ret
