From e2754dc887e285ffe1c2871f3da421b9aadf1d6d Mon Sep 17 00:00:00 2001
From: Michael Ilseman <milseman@apple.com>
Date: Fri, 14 Dec 2012 22:08:26 +0000
Subject: Add back FoldOpIntoPhi optimizations with fix. Included test cases to
 help catch these errors and to test the presence of the optimization itself

llvm-svn: 170248
---
 llvm/test/Transforms/InstCombine/fold-phi.ll | 39 ++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 llvm/test/Transforms/InstCombine/fold-phi.ll

(limited to 'llvm/test')

diff --git a/llvm/test/Transforms/InstCombine/fold-phi.ll b/llvm/test/Transforms/InstCombine/fold-phi.ll
new file mode 100644
index 00000000000..bd01d58aa58
--- /dev/null
+++ b/llvm/test/Transforms/InstCombine/fold-phi.ll
@@ -0,0 +1,39 @@
+; RUN: opt < %s -instcombine -S | FileCheck %s
+
+; CHECK: no_crash
+define float @no_crash(float %a) nounwind {
+entry:
+  br label %for.body
+
+for.body:
+  %sum.057 = phi float [ 0.000000e+00, %entry ], [ %add5, %bb0 ]
+  %add5 = fadd float %sum.057, %a    ; PR14592
+  br i1 undef, label %bb0, label %end
+
+bb0:
+  br label %for.body
+
+end:
+  ret float %add5
+}
+
+; CHECK: fold_phi
+define float @fold_phi(float %a) nounwind {
+entry:
+  br label %for.body
+
+for.body:
+; CHECK: phi float
+; CHECK-NEXT: br i1 undef
+  %sum.057 = phi float [ 0.000000e+00, %entry ], [ %add5, %bb0 ]
+  %add5 = fadd float %sum.057, 1.0 ;; Should be moved to the latch!
+  br i1 undef, label %bb0, label %end
+
+; CHECK: bb0:
+bb0:
+; CHECK: fadd float
+  br label %for.body
+
+end:
+  ret float %add5
+}
-- 
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