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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [AVX512] Failure to flip vector comparison to remove not mask instruction"
href="https://llvm.org/bugs/show_bug.cgi?id=30945">30945</a>
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<tr>
<th>Summary</th>
<td>[AVX512] Failure to flip vector comparison to remove not mask instruction
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Backend: X86
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>llvm-dev@redking.me.uk
</td>
</tr>
<tr>
<th>CC</th>
<td>craig.topper@gmail.com, elena.demikhovsky@intel.com, igor.breger@intel.com, llvm-bugs@lists.llvm.org
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</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Unearthed by <a href="https://reviews.llvm.org/rL286238">https://reviews.llvm.org/rL286238</a>
define <16 x i32> @test14(<16 x i32>%a, <16 x i32>%b) {
; CHECK-LABEL: test14:
; CHECK: ## BB#0:
; CHECK-NEXT: vpsubd %zmm1, %zmm0, %zmm1
; CHECK-NEXT: vpcmpled %zmm0, %zmm1, %k0
; CHECK-NEXT: knotw %k0, %k1 <-- REMOVED IF WE USED vpcmpgtd INSTEAD
; CHECK-NEXT: vmovdqa32 %zmm1, %zmm0 {%k1} {z}
; CHECK-NEXT: retq
%sub_r = sub <16 x i32> %a, %b
%cmp.i2.i = icmp sgt <16 x i32> %sub_r, %a
%sext.i3.i = sext <16 x i1> %cmp.i2.i to <16 x i32>
%mask = icmp eq <16 x i32> %sext.i3.i, zeroinitializer
%res = select <16 x i1> %mask, <16 x i32> zeroinitializer, <16 x i32> %sub_r
ret <16 x i32>%res
}
define <8 x i64> @test15(<8 x i64>%a, <8 x i64>%b) {
; CHECK-LABEL: test15:
; CHECK: ## BB#0:
; CHECK-NEXT: vpsubq %zmm1, %zmm0, %zmm1
; CHECK-NEXT: vpcmpleq %zmm0, %zmm1, %k0
; CHECK-NEXT: knotw %k0, %k1m <-- REMOVED IF WE USED vpcmpgtq INSTEAD
; CHECK-NEXT: vmovdqa64 %zmm1, %zmm0 {%k1} {z}
; CHECK-NEXT: retq
%sub_r = sub <8 x i64> %a, %b
%cmp.i2.i = icmp sgt <8 x i64> %sub_r, %a
%sext.i3.i = sext <8 x i1> %cmp.i2.i to <8 x i64>
%mask = icmp eq <8 x i64> %sext.i3.i, zeroinitializer
%res = select <8 x i1> %mask, <8 x i64> zeroinitializer, <8 x i64> %sub_r
ret <8 x i64>%res
}</pre>
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