From 80c1ea6f9baedf7e957e1c26f960792f016b5329 Mon Sep 17 00:00:00 2001
From: Nadav Rotem <nadav.rotem@intel.com>
Date: Tue, 24 Apr 2012 20:18:49 +0000
Subject: ConstantFoldSelectInstruction swapped the operands of the select.

Fix 12592. Patch by Matt Pharr.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@155480 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/VMCore/ConstantFold.cpp                       |  2 +-
 test/Transforms/InstCombine/2012-04-24-vselect.ll | 13 +++++++++++++
 2 files changed, 14 insertions(+), 1 deletion(-)
 create mode 100644 test/Transforms/InstCombine/2012-04-24-vselect.ll

diff --git a/lib/VMCore/ConstantFold.cpp b/lib/VMCore/ConstantFold.cpp
index b743287adf3..9b1c756b7de 100644
--- a/lib/VMCore/ConstantFold.cpp
+++ b/lib/VMCore/ConstantFold.cpp
@@ -700,7 +700,7 @@ Constant *llvm::ConstantFoldSelectInstruction(Constant *Cond,
       ConstantInt *Cond = dyn_cast<ConstantInt>(CondV->getOperand(i));
       if (Cond == 0) break;
       
-      Constant *Res = (Cond->getZExtValue() ? V2 : V1)->getAggregateElement(i);
+      Constant *Res = (Cond->getZExtValue() ? V1 : V2)->getAggregateElement(i);
       if (Res == 0) break;
       Result.push_back(Res);
     }
diff --git a/test/Transforms/InstCombine/2012-04-24-vselect.ll b/test/Transforms/InstCombine/2012-04-24-vselect.ll
new file mode 100644
index 00000000000..8d2de2b2431
--- /dev/null
+++ b/test/Transforms/InstCombine/2012-04-24-vselect.ll
@@ -0,0 +1,13 @@
+; RUN: opt -instcombine -S < %s | FileCheck %s
+
+; CHECK: @foo
+; CHECK: <i32 1, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0>
+
+define <8 x i32> @foo() nounwind {
+entry:
+  %v1.i = select <8 x i1> <i1 true, i1 false, i1 false, i1 false, i1 false, i1 false, i1 false, i1 false>,
+    <8 x i32> <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>,
+    <8 x i32> <i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0>
+  ret <8 x i32> %v1.i
+}
+
-- 
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