From cbfe9df0966e333d78b2eb972171cd00856f45f0 Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Wed, 22 Apr 2009 22:45:37 +0000
Subject: Avoid deferencing use_begin() if value does not have a use.

llvm-svn: 69836
---
 .../Transforms/IndVarSimplify/2009-04-22-IndvarCrash.ll | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100644 llvm/test/Transforms/IndVarSimplify/2009-04-22-IndvarCrash.ll

(limited to 'llvm/test/Transforms/IndVarSimplify')

diff --git a/llvm/test/Transforms/IndVarSimplify/2009-04-22-IndvarCrash.ll b/llvm/test/Transforms/IndVarSimplify/2009-04-22-IndvarCrash.ll
new file mode 100644
index 00000000000..e42f3b33354
--- /dev/null
+++ b/llvm/test/Transforms/IndVarSimplify/2009-04-22-IndvarCrash.ll
@@ -0,0 +1,17 @@
+; RUN: llvm-as < %s | opt -indvars
+
+define i32 @t() nounwind ssp {
+entry:
+	br label %bb32
+
+bb32:		; preds = %bb32, %entry
+	%mbPartIdx.0.reg2mem.0 = phi i8 [ %2, %bb32 ], [ 0, %entry ]		; <i8> [#uses=3]
+	%0 = and i8 %mbPartIdx.0.reg2mem.0, 1		; <i8> [#uses=0]
+	%1 = zext i8 %mbPartIdx.0.reg2mem.0 to i64		; <i64> [#uses=0]
+	%2 = add i8 %mbPartIdx.0.reg2mem.0, 1		; <i8> [#uses=2]
+	%3 = icmp ugt i8 %2, 3		; <i1> [#uses=1]
+	br i1 %3, label %bb41, label %bb32
+
+bb41:		; preds = %bb32
+	ret i32 0
+}
-- 
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