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872392e1a9
Summary: replaceCongruentIVs can break LCSSA when trying to replace IV increments since it tries to replace all uses of a phi node with another phi node while both of the phi nodes are not necessarily in the processed loop. This will cause an assert in IndVars. To fix this, we add a check to make sure that the replacement maintains LCSSA. Reviewers: sanjoy Subscribers: mzolotukhin, llvm-commits Differential Revision: http://reviews.llvm.org/D18266 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@263941 91177308-0d34-0410-b5e6-96231b3b80d8
61 lines
2.2 KiB
LLVM
61 lines
2.2 KiB
LLVM
; RUN: opt -indvars -S < %s | FileCheck %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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; indvars will try to replace %b.0.lcssa with %t.1. If it does this,
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; it will break LCSSA.
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@c = external global i32, align 4
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; CHECK-LABEL: @fn1
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define void @fn1() {
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entry:
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br label %for.body
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for.cond1.preheader: ; preds = %for.body
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%0 = load i32, i32* @c, align 4
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br i1 undef, label %for.cond1.us.preheader, label %for.cond1
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for.cond1.us.preheader: ; preds = %for.cond1.preheader
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br label %for.cond1.us
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for.cond1.us: ; preds = %for.cond1.us, %for.cond1.us.preheader
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br label %for.cond1.us
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for.body: ; preds = %for.body, %entry
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br i1 undef, label %for.body, label %for.cond1.preheader
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for.cond1: ; preds = %for.cond1.preheader
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br i1 true, label %for.body9.lr.ph, label %for.cond13.preheader
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for.body9.lr.ph: ; preds = %for.cond1
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br i1 undef, label %for.body9.us.preheader, label %for.body9
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for.body9.us.preheader: ; preds = %for.body9.lr.ph
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br label %for.body9.us
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for.body9.us: ; preds = %for.body9.us, %for.body9.us.preheader
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br label %for.body9.us
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for.cond13.preheader: ; preds = %for.body9, %for.cond1
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%b.0.lcssa = phi i32 [ %0, %for.body9 ], [ 0, %for.cond1 ]
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br label %for.cond13
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for.body9: ; preds = %for.body9.lr.ph
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br label %for.cond13.preheader
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for.cond13: ; preds = %for.cond13, %for.cond13.preheader
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%d.1 = phi i32 [ %t.1, %for.cond13 ], [ %0, %for.cond13.preheader ]
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%t.1 = phi i32 [ %b.0.lcssa, %for.cond13 ], [ %0, %for.cond13.preheader ]
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br i1 undef, label %for.cond18.preheader, label %for.cond13
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for.cond18.preheader: ; preds = %for.cond13
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br label %for.cond18
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for.cond18: ; preds = %for.cond18, %for.cond18.preheader
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%b.1 = phi i32 [ %xor, %for.cond18 ], [ %b.0.lcssa, %for.cond18.preheader ]
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%add = add nsw i32 %b.1, %d.1
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%xor = xor i32 %add, %b.1
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br label %for.cond18
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}
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