derek.holloway
7502bf64a4
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30 lines
1.0 KiB
LLVM
30 lines
1.0 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6
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; RUN: opt -passes=gvn -S < %s | FileCheck %s
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; Check that an unreachable predecessor to a PHI node doesn't cause a crash.
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; PR21625. The first load should be removed, since it's ignored.
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define i32 @f(ptr %f) {
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; CHECK-LABEL: define i32 @f(
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; CHECK-SAME: ptr [[F:%.*]]) {
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; CHECK-NEXT: [[BB0:.*]]:
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; CHECK-NEXT: br label %[[BB2:.*]]
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; CHECK: [[BB1:.*]]:
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; CHECK-NEXT: [[ZED:%.*]] = load ptr, ptr [[F]], align 8
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; CHECK-NEXT: br i1 false, label %[[BB1]], label %[[BB2]]
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; CHECK: [[BB2]]:
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; CHECK-NEXT: [[FOO:%.*]] = phi ptr [ null, %[[BB0]] ], [ [[ZED]], %[[BB1]] ]
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; CHECK-NEXT: [[STOREMERGE:%.*]] = load i32, ptr [[FOO]], align 4
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; CHECK-NEXT: ret i32 [[STOREMERGE]]
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;
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bb0:
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%bar = load ptr, ptr %f
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br label %bb2
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bb1:
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%zed = load ptr, ptr %f
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br i1 false, label %bb1, label %bb2
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bb2:
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%foo = phi ptr [ null, %bb0 ], [ %zed, %bb1 ]
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%storemerge = load i32, ptr %foo
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ret i32 %storemerge
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}
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