[Bug target/96861] New: Integer min/max optimization failed under -march=skylake-avx512

[crazylht at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96861

            Bug ID: 96861
           Summary: Integer min/max optimization failed under
                    -march=skylake-avx512
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: crazylht at gmail dot com
                CC: hjl.tools at gmail dot com
  Target Milestone: ---
            Target: i386, x86-64

cat minmax-10.c

---
#define max(a,b) (((a) > (b))) ? (a) : (b)
#define min(a,b) (((a) < (b))) ? (a) : (b)

int smax1(int x)
{
    return max(x,1);
}
---

gcc -O2 -march=skylake-avx512 -S

---
smax1(int):
        vmovdqa xmm1, XMMWORD PTR .LC0[rip]
        vmovd   xmm0, edi
        vpmaxsd xmm0, xmm0, xmm1
        vmovd   eax, xmm0
        ret
---

gcc -O2 -march=x86-64 -S
---
smax1(int):
        test    edi, edi
        mov     eax, 1
        cmovg   eax, edi
        ret
---

It seems cost model need to be adjusted for skylake_cost.