On Fri, May 8, 2020 at 7:22 PM Uros Bizjak <ubiz...@gmail.com> wrote:
>
> Attached WIP patch enables auto-vectorization of basic V2SF operations
> (plus, minus, mult, min/max). The compiler takes care that everything
> is loaded from memory via movq insn, so top two registers always
> remain zero.
This example:
--cut here--
float r[2], a[2], b[2], c[2];
void foo (void)
{
for (int i = 0; i < 2; i++)
r[i] = 0.0f + a[i] - b[i] * c[i] + -1.0f;
}
--cut here--
compiles (-O3) to:
foo:
movq a(%rip), %xmm0
xorps %xmm1, %xmm1
movq c(%rip), %xmm2
addps %xmm1, %xmm0
movq b(%rip), %xmm1
mulps %xmm2, %xmm1
subps %xmm1, %xmm0
movq .LC0(%rip), %xmm1
addps %xmm1, %xmm0
movlps %xmm0, r(%rip)
ret
Uros.
