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7c619d4ea7
Summary: The current instruction sink pass uses findNearestCommonDominator of all users to find block to sink the instruction to. However, a user may be in a dead block, which will result in unexpected behavior. This patch handles such cases by skipping dead blocks. This patch fixes: https://bugs.llvm.org/show_bug.cgi?id=47415 Reviewers: MaskRay, arsenm Differential Revision: https://reviews.llvm.org/D89166
43 lines
1.4 KiB
LLVM
43 lines
1.4 KiB
LLVM
; Compiler should not be broken with a dead user.
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; RUN: opt -sink -S < %s | FileCheck %s
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; CHECK-LABEL: @test(
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; CHECK: bb.0:
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; CHECK-NEXT: %conv = sext i16 %p1 to i32
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; CHECK-NEXT: br i1 undef, label %bb.1, label %bb.3
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; CHECK: bb.1: ; preds = %bb.0
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; CHECK-NEXT: br label %bb.2
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; CHECK: bb.2: ; preds = %bb.2, %bb.1
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; CHECK-NEXT: %and.2 = and i32 undef, %conv
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; CHECK-NEXT: br label %bb.2
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; CHECK: bb.3: ; preds = %bb.3, %bb.0
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; CHECK-NEXT: %and.3 = and i32 undef, %conv
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; CHECK-NEXT: br label %bb.3
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; CHECK: dead: ; preds = %dead
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; CHECK-NEXT: %and.dead = and i32 undef, %conv
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; CHECK-NEXT: br label %dead
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define void @test(i16 %p1) {
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bb.0:
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%conv = sext i16 %p1 to i32
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br i1 undef, label %bb.1, label %bb.3
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bb.1: ; preds = %bb.0
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br label %bb.2
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bb.2: ; preds = %bb.2, %bb.1
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%and.2 = and i32 undef, %conv
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br label %bb.2
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bb.3: ; preds = %bb.3, %bb.0
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%and.3 = and i32 undef, %conv
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br label %bb.3
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dead: ; preds = %dead
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%and.dead = and i32 undef, %conv
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br label %dead
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}
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