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a0b59f6bd2
This pass addresses the missed optimizations from PR2581 and PR4420. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112325 91177308-0d34-0410-b5e6-96231b3b80d8
25 lines
711 B
LLVM
25 lines
711 B
LLVM
; RUN: opt < %s -value-propagation -S | FileCheck %s
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; PR4420
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declare i1 @ext()
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; CHECK: @foo
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define i1 @foo() {
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entry:
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%cond = tail call i1 @ext() ; <i1> [#uses=2]
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br i1 %cond, label %bb1, label %bb2
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bb1: ; preds = %entry
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%cond2 = tail call i1 @ext() ; <i1> [#uses=1]
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br i1 %cond2, label %bb3, label %bb2
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bb2: ; preds = %bb1, %entry
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; CHECK-NOT: phi i1
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%cond_merge = phi i1 [ %cond, %entry ], [ false, %bb1 ] ; <i1> [#uses=1]
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; CHECK: ret i1 false
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ret i1 %cond_merge
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bb3: ; preds = %bb1
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%res = tail call i1 @ext() ; <i1> [#uses=1]
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; CHECK: ret i1 %res
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ret i1 %res
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} |