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llvm-svn: 186268
82 lines
1.8 KiB
LLVM
82 lines
1.8 KiB
LLVM
; RUN: opt -loop-reduce -S < %s | FileCheck %s
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;
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; Test LSR's use of SplitCriticalEdge during phi rewriting.
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target triple = "x86-apple-darwin"
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; Verify that identical edges are merged. rdar://problem/6453893
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; CHECK-LABEL: @test1(
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; CHECK: bb89:
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; CHECK: phi i8* [ %lsr.iv.next1, %bbA.bb89_crit_edge ], [ %lsr.iv.next1, %bbB.bb89_crit_edge ]{{$}}
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define i8* @test1() {
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entry:
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br label %loop
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loop:
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%rec = phi i32 [ %next, %loop ], [ 0, %entry ]
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%next = add i32 %rec, 1
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%tmp75 = getelementptr i8* null, i32 %next
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br i1 false, label %loop, label %loopexit
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loopexit:
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br i1 false, label %bbA, label %bbB
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bbA:
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switch i32 0, label %bb89 [
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i32 47, label %bb89
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i32 58, label %bb89
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]
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bbB:
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switch i8 0, label %bb89 [
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i8 47, label %bb89
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i8 58, label %bb89
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]
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bb89:
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%tmp75phi = phi i8* [ %tmp75, %bbA ], [ %tmp75, %bbA ], [ %tmp75, %bbA ], [ %tmp75, %bbB ], [ %tmp75, %bbB ], [ %tmp75, %bbB ]
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br label %exit
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exit:
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ret i8* %tmp75phi
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}
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; Handle single-predecessor phis: PR13756
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; CHECK-LABEL: @test2(
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; CHECK: bb89:
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; CHECK: phi i8* [ %lsr.iv.next1, %bbA ], [ %lsr.iv.next1, %bbA ], [ %lsr.iv.next1, %bbA ]{{$}}
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define i8* @test2() {
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entry:
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br label %loop
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loop:
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%rec = phi i32 [ %next, %loop ], [ 0, %entry ]
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%next = add i32 %rec, 1
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%tmp75 = getelementptr i8* null, i32 %next
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br i1 false, label %loop, label %loopexit
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loopexit:
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br i1 false, label %bbA, label %bbB
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bbA:
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switch i32 0, label %bb89 [
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i32 47, label %bb89
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i32 58, label %bb89
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]
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bbB:
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switch i8 0, label %exit [
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i8 47, label %exit
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i8 58, label %exit
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]
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bb89:
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%tmp75phi = phi i8* [ %tmp75, %bbA ], [ %tmp75, %bbA ], [ %tmp75, %bbA ]
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br label %exit
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exit:
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%result = phi i8* [ %tmp75phi, %bb89 ], [ %tmp75, %bbB ], [ %tmp75, %bbB ], [ %tmp75, %bbB ]
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ret i8* %result
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}
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