derek.holloway
7502bf64a4
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35 lines
1.2 KiB
LLVM
35 lines
1.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; Test a bunch of cases where the cfg simplification code should
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; be able to fold PHI nodes into computation in common cases. Folding the PHI
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; nodes away allows the branches to be eliminated, performing a simple form of
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; 'if conversion'.
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; RUN: opt < %s -passes=simplifycfg -simplifycfg-require-and-preserve-domtree=1 -S | FileCheck %s
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declare void @use(i1)
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declare void @use.upgrd.1(i32)
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define void @test(i1 %c, i32 %V, i32 %V2) {
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; <label>:0
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; CHECK-LABEL: @test(
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; CHECK-NEXT: F:
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; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[C:%.*]], i1 false, i1 true
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; CHECK-NEXT: [[SPEC_SELECT1:%.*]] = select i1 [[C]], i32 0, i32 [[V:%.*]]
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; CHECK-NEXT: call void @use(i1 [[SPEC_SELECT]])
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; CHECK-NEXT: call void @use.upgrd.1(i32 [[SPEC_SELECT1]])
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; CHECK-NEXT: ret void
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;
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br i1 %c, label %T, label %F
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T: ; preds = %0
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br label %F
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F: ; preds = %T, %0
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%B1 = phi i1 [ true, %0 ], [ false, %T ] ; <i1> [#uses=1]
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%I6 = phi i32 [ %V, %0 ], [ 0, %T ] ; <i32> [#uses=1]
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call void @use( i1 %B1 )
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call void @use.upgrd.1( i32 %I6 )
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ret void
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}
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