https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97147
--- Comment #2 from Hongtao.liu <crazylht at gmail dot com> ---
Disable (define_insn "*sse3_haddv2df3_low" and (define_insn
"*sse3_hsubv2df3_low" seems to be ok.
But for foo1.
v2df foo1 (v2df x, v2df y)
{
v2df a;
a[0] = x[0] + x[1];
a[1] = y[0] + y[1];
return a;
}
it's
vhaddpd %xmm1, %xmm0, %xmm0
ret
vs
movapd xmm2, xmm0
unpckhpd xmm2, xmm2
addsd xmm0, xmm2
movapd xmm2, xmm1
unpckhpd xmm1, xmm1
addsd xmm1, xmm2
unpcklpd xmm0, xmm1
ret
and note w/o vhaddpd, codegen can be optimized to
movapd xmm2, xmm0
unpcklpd xmm2, xmm1
unpckhpd xmm0, xmm1
addpd xmm0, xmm2
ret
Guess maybe it's better done in gimple level?
