[Bug target/89229] Unnecessary ZMM in movoi_internal_avx/movti_internal

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89229

--- Comment #17 from H.J. Lu <hjl.tools at gmail dot com> ---
[hjl@gnu-4 gcc]$ cat /tmp/z.c
/* { dg-do compile { target { ! ia32 } } } */
/* { dg-options "-O2 -march=skylake-avx512" } */

extern long long i;

long long
foo1 (void)
{
  register long long xmm16 __asm ("xmm16") = i;
  asm volatile ("" : "+v" (xmm16));
  register long long xmm17 __asm ("xmm17") = xmm16;
  asm volatile ("" : "+v" (xmm17));
  return xmm17;
}

/* { dg-final { scan-assembler-times
"vmovdqa32\[^\n\r]*xmm1\[67]\[^\n\r]*xmm1\[67]" 1 } } */
/* { dg-final { scan-assembler-not "%zmm\[0-9\]+" } } */
[hjl@gnu-4 gcc]$ gcc -S -O2 -march=skylake-avx512 /tmp/z.c   -mno-avx512vl
[hjl@gnu-4 gcc]$ cat z.s
        .file   "z.c"
        .text
        .p2align 4,,15
        .globl  foo1
        .type   foo1, @function
foo1:
.LFB0:
        .cfi_startproc
        vmovq   i(%rip), %xmm16
        vmovdqa64       %xmm16, %xmm17  <<< This is an AVX512VL instruction.
        vmovq   %xmm17, %rax
        ret
        .cfi_endproc
.LFE0:
        .size   foo1, .-foo1
        .ident  "GCC: (GNU) 8.2.1 20190209 (Red Hat 8.2.1-8)"
        .section        .note.GNU-stack,"",@progbits
[hjl@gnu-4 gcc]$