[llvm-bugs] [Bug 31534] New: AVX-512 No optimal lowering for mask_blend intrinsics.

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https://llvm.org/bugs/show_bug.cgi?id=31534

            Bug ID: 31534
           Summary: AVX-512  No optimal lowering for mask_blend
                    intrinsics.
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: igor.breger at intel.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

In case mask is constant mask_blend intrinsic generate not optimal sequence.
It should generate vpblendm instruction.

__m512i test_mm512_mask_blend_epi32(__m512i __A, __m512i __W) {
  return _mm512_mask_blend_epi32(0xaaaa,__A,__W); 
}

define <8 x i64> @test_mm512_mask_blend_epi32(<8 x i64> %__A, <8 x i64> %__W)
local_unnamed_addr #0 {
entry:
  %0 = bitcast <8 x i64> %__W to <16 x i32>
  %1 = bitcast <8 x i64> %__A to <16 x i32>
  %2 = shufflevector <16 x i32> %0, <16 x i32> %1, <16 x i32> <i32 16, i32 1,
i32 18, i32 3, i32 20, i32 5, i32 22, i32 7, i32 24, i32 9, i32 26, i32 11, i32
28, i32 13, i32 30, i32 15>
  %3 = bitcast <16 x i32> %2 to <8 x i64>
  ret <8 x i64> %3
}

# BB#0:                                 # %entry
    vmovdqa32    .LCPI2_0(%rip), %zmm2 # zmm2 =
[0,17,2,19,4,21,6,23,8,25,10,27,12,29,14,31]
    vpermt2d    %zmm1, %zmm2, %zmm0
    retq
.Lfunc_end2:

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