https://bugs.llvm.org/show_bug.cgi?id=40332
Bug ID: 40332
Summary: [x86, AVX512] failed to merge mask select across
extract_subvector
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: X86
Assignee: unassignedb...@nondot.org
Reporter: spatel+l...@rotateright.com
CC: craig.top...@gmail.com, llvm-bugs@lists.llvm.org,
llvm-...@redking.me.uk, spatel+l...@rotateright.com
As noted in https://reviews.llvm.org/D56756 - we have this and similar
regression tests in test/CodeGen/X86/avx512-shuffles/partial_permute.ll:
define <4 x i32> @test_masked_z_8xi32_to_4xi32_perm_mask3(<8 x i32> %vec, <4 x
i32> %mask) {
; CHECK-LABEL: test_masked_z_8xi32_to_4xi32_perm_mask3:
; CHECK: # %bb.0:
; CHECK-NEXT: vmovdqa {{.*#+}} ymm2 = <5,3,2,5,u,u,u,u>
; CHECK-NEXT: vpermd %ymm0, %ymm2, %ymm0
; CHECK-NEXT: vptestnmd %xmm1, %xmm1, %k1
; CHECK-NEXT: vmovdqa32 %xmm0, %xmm0 {%k1} {z}
; CHECK-NEXT: vzeroupper
; CHECK-NEXT: retq
%shuf = shufflevector <8 x i32> %vec, <8 x i32> undef, <4 x i32> <i32 5, i32
3, i32 2, i32 5>
%cmp = icmp eq <4 x i32> %mask, zeroinitializer
%res = select <4 x i1> %cmp, <4 x i32> %shuf, <4 x i32> zeroinitializer
ret <4 x i32> %res
}
Ideally, the masking would be included in the shuffle:
vmovdqa {{.*#+}} ymm2 = <5,3,2,5,u,u,u,u>
vptestnmd %xmm1, %xmm1, %k1
vpermd %ymm0, %ymm2, %ymm0 {%k1} {z}
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