derek.holloway
7502bf64a4
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26 lines
1.3 KiB
LLVM
26 lines
1.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
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; RUN: opt -S -mtriple=amdgcn-amd-amdhsa -passes=instcombine %s | FileCheck %s
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; Check that `select B, true, C` isn't optimized to `or B, C`,
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; because the invalid addrspacecast %asc.shared introduces poison.
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define i1 @not_fold_select(ptr addrspace(1) noundef %x) {
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; CHECK-LABEL: define i1 @not_fold_select(
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; CHECK-SAME: ptr addrspace(1) noundef [[X:%.*]]) {
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; CHECK-NEXT: [[ENTRY:.*:]]
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; CHECK-NEXT: [[TMP0:%.*]] = addrspacecast ptr addrspace(1) [[X]] to ptr
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; CHECK-NEXT: [[TMP1:%.*]] = tail call i1 @llvm.amdgcn.is.shared(ptr [[TMP0]])
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; CHECK-NEXT: [[TMP2:%.*]] = addrspacecast ptr addrspace(1) [[X]] to ptr addrspace(3)
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; CHECK-NEXT: [[TMP3:%.*]] = icmp eq ptr addrspace(3) [[TMP2]], null
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; CHECK-NEXT: [[NOT_IS_SHARED:%.*]] = xor i1 [[TMP1]], true
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; CHECK-NEXT: [[TMP4:%.*]] = select i1 [[NOT_IS_SHARED]], i1 true, i1 [[TMP3]]
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; CHECK-NEXT: ret i1 [[TMP4]]
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;
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entry:
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%asc.flat = addrspacecast ptr addrspace(1) %x to ptr
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%is.shared = tail call i1 @llvm.amdgcn.is.shared(ptr %asc.flat)
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%asc.shared = addrspacecast ptr %asc.flat to ptr addrspace(3)
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%shared.addr = select i1 %is.shared, ptr addrspace(3) %asc.shared, ptr addrspace(3) zeroinitializer
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%result = icmp eq ptr addrspace(3) %shared.addr, null
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ret i1 %result
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}
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