On Wed, Jun 26, 2019 at 10:17 AM Uros Bizjak <ubiz...@gmail.com> wrote:
>
> Now that TARGET_MMX_WITH_SSE is implemented, the compiler should be
> able to auto-vectorize:
On a related note, following slightly changed testcase:
void
foo (char *restrict r, char *restrict a)
{
for (int i = 0; i < 24; i++)
r[i] += a[i];
}
compiles to:
foo:
vmovdqu (%rdi), %xmm1
vpaddb (%rsi), %xmm1, %xmm0
movzbl 16(%rsi), %eax
addb %al, 16(%rdi)
vmovups %xmm0, (%rdi)
movzbl 17(%rsi), %eax
addb %al, 17(%rdi)
movzbl 18(%rsi), %eax
addb %al, 18(%rdi)
movzbl 19(%rsi), %eax
addb %al, 19(%rdi)
movzbl 20(%rsi), %eax
addb %al, 20(%rdi)
movzbl 21(%rsi), %eax
addb %al, 21(%rdi)
movzbl 22(%rsi), %eax
addb %al, 22(%rdi)
movzbl 23(%rsi), %eax
addb %al, 23(%rdi)
ret
One would expect that the remaining 8-byte array would also get
vectorized, resulting in one 16-byte operation and one 8-byte
operation.
Uros.
