Test case for r139453, WidenIV::GetExtendedOperandRecurrence.

llvm-svn: 139504

1 files changed, 30 insertions, 0 deletions

diff --git a/llvm/test/Transforms/IndVarSimplify/2011-09-10-widen-nsw.ll b/llvm/test/Transforms/IndVarSimplify/2011-09-10-widen-nsw.ll
new file mode 100644
index 00000000000..4dc3c1ea48c
--- /dev/null
+++ b/llvm/test/Transforms/IndVarSimplify/2011-09-10-widen-nsw.ll
@@ -0,0 +1,30 @@
+; RUN: opt < %s -indvars -disable-iv-rewrite -S | FileCheck %s
+; Test WidenIV::GetExtendedOperandRecurrence.
+; add219 should be extended to i64 because it is nsw, even though its
+; sext cannot be hoisted outside the loop.
+
+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-n8:16:32:64"
+
+define void @test() nounwind {
+entry:
+  br i1 undef, label %for.body11, label %for.end285
+
+for.body11:                                       ; preds = %entry
+  %shl = shl i32 1, 1
+  %shl132 = shl i32 %shl, 1
+  br label %for.body153
+
+for.body153:                                      ; preds = %for.body153, %for.body11
+  br i1 undef, label %for.body170, label %for.body153
+
+; CHECK: add nsw i64 %indvars.iv, 1
+for.body170:                                      ; preds = %for.body170, %for.body153
+  %i2.19 = phi i32 [ %add249, %for.body170 ], [ undef, %for.body153 ]
+  %add219 = add nsw i32 %i2.19, 1
+  %idxprom220 = sext i32 %add219 to i64
+  %add249 = add nsw i32 %i2.19, %shl132
+  br label %for.body170
+
+for.end285:                                       ; preds = %entry
+  ret void
+}