Updating branches/google/stable to r178511stable

git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/google/stable@178655 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 38 insertions, 0 deletions

diff --git a/test/Transforms/IndVarSimplify/phi-uses-value-multiple-times.ll b/test/Transforms/IndVarSimplify/phi-uses-value-multiple-times.ll
new file mode 100644
index 0000000000..dc36b99482
--- /dev/null
+++ b/test/Transforms/IndVarSimplify/phi-uses-value-multiple-times.ll
@@ -0,0 +1,38 @@
+; REQUIRES: asserts
+; RUN: opt < %s -indvars -disable-output -stats -info-output-file - | FileCheck %s
+; Check that IndVarSimplify is not creating unnecessary canonical IVs
+; that will never be used.
+; CHECK-NOT: indvars
+
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128"
+
+@ue = external global i64
+
+define i32 @foo() nounwind {
+entry:
+	br label %bb38.i
+
+bb14.i27:
+	%t0 = load i64* @ue, align 8
+	%t1 = sub i64 %t0, %i.0.i35
+	%t2 = add i64 %t1, 1
+	br i1 undef, label %bb15.i28, label %bb19.i31
+
+bb15.i28:
+	br label %bb19.i31
+
+bb19.i31:
+	%y.0.i = phi i64 [ %t2, %bb15.i28 ], [ %t2, %bb14.i27 ]
+	br label %bb35.i
+
+bb35.i:
+	br i1 undef, label %bb37.i, label %bb14.i27
+
+bb37.i:
+	%t3 = add i64 %i.0.i35, 1
+	br label %bb38.i
+
+bb38.i:
+	%i.0.i35 = phi i64 [ 1, %entry ], [ %t3, %bb37.i ]
+	br label %bb35.i
+}