derek.holloway
7502bf64a4
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41 lines
1.1 KiB
LLVM
41 lines
1.1 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; Test merging of blocks that only have PHI nodes in them. This tests the case
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; where the mergedinto block doesn't have any PHI nodes, and is in fact
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; dominated by the block-to-be-eliminated
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;
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; RUN: opt < %s -passes=simplifycfg -simplifycfg-require-and-preserve-domtree=1 -S | FileCheck %s
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;
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declare i1 @foo()
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define i32 @test(i1 %a, i1 %b) {
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; CHECK-LABEL: @test(
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; CHECK-NEXT: [[C:%.*]] = call i1 @foo()
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; CHECK-NEXT: br i1 [[C]], label [[M:%.*]], label [[P:%.*]]
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; CHECK: P:
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; CHECK-NEXT: [[D:%.*]] = call i1 @foo()
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; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[D]], i32 2, i32 1
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; CHECK-NEXT: br label [[M]]
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; CHECK: M:
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; CHECK-NEXT: [[W:%.*]] = phi i32 [ 0, [[TMP0:%.*]] ], [ [[SPEC_SELECT]], [[P]] ]
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; CHECK-NEXT: [[R:%.*]] = add i32 [[W]], 1
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; CHECK-NEXT: ret i32 [[R]]
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;
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%c = call i1 @foo()
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br i1 %c, label %N, label %P
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P:
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%d = call i1 @foo()
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br i1 %d, label %N, label %Q
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Q:
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br label %N
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N:
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%W = phi i32 [0, %0], [1, %Q], [2, %P]
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; This block should be foldable into M
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br label %M
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M:
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%R = add i32 %W, 1
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ret i32 %R
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}
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