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; RUN: opt -indvars -S < %s | FileCheck %s
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
; indvars will try to replace %b.0.lcssa with %t.1. If it does this,
; it will break LCSSA.
@c = external global i32, align 4
; CHECK-LABEL: @fn1
define void @fn1() {
entry:
br label %for.body
for.cond1.preheader: ; preds = %for.body
%0 = load i32, i32* @c, align 4
br i1 undef, label %for.cond1.us.preheader, label %for.cond1
for.cond1.us.preheader: ; preds = %for.cond1.preheader
br label %for.cond1.us
for.cond1.us: ; preds = %for.cond1.us, %for.cond1.us.preheader
br label %for.cond1.us
for.body: ; preds = %for.body, %entry
br i1 undef, label %for.body, label %for.cond1.preheader
for.cond1: ; preds = %for.cond1.preheader
br i1 true, label %for.body9.lr.ph, label %for.cond13.preheader
for.body9.lr.ph: ; preds = %for.cond1
br i1 undef, label %for.body9.us.preheader, label %for.body9
for.body9.us.preheader: ; preds = %for.body9.lr.ph
br label %for.body9.us
for.body9.us: ; preds = %for.body9.us, %for.body9.us.preheader
br label %for.body9.us
for.cond13.preheader: ; preds = %for.body9, %for.cond1
%b.0.lcssa = phi i32 [ %0, %for.body9 ], [ 0, %for.cond1 ]
br label %for.cond13
for.body9: ; preds = %for.body9.lr.ph
br label %for.cond13.preheader
for.cond13: ; preds = %for.cond13, %for.cond13.preheader
%d.1 = phi i32 [ %t.1, %for.cond13 ], [ %0, %for.cond13.preheader ]
%t.1 = phi i32 [ %b.0.lcssa, %for.cond13 ], [ %0, %for.cond13.preheader ]
br i1 undef, label %for.cond18.preheader, label %for.cond13
for.cond18.preheader: ; preds = %for.cond13
br label %for.cond18
for.cond18: ; preds = %for.cond18, %for.cond18.preheader
%b.1 = phi i32 [ %xor, %for.cond18 ], [ %b.0.lcssa, %for.cond18.preheader ]
%add = add nsw i32 %b.1, %d.1
%xor = xor i32 %add, %b.1
br label %for.cond18
}
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