From 1121c786fc24a4a8ce6c778cb9b5acdfa9006ffb Mon Sep 17 00:00:00 2001
From: Pete Cooper <peter_cooper@apple.com>
Date: Thu, 26 Jul 2012 22:37:04 +0000
Subject: Teach SimplifyDemandedBits how to look through fpext and fptrunc to
 simplify their operand

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160823 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'lib/Transforms')

diff --git a/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp b/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp
index 125c74a..46ba83b 100644
--- a/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp
+++ b/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp
@@ -1074,6 +1074,12 @@ Value *InstCombiner::SimplifyDemandedVectorElts(Value *V, APInt DemandedElts,
     // like undef&0.  The result is known zero, not undef.
     UndefElts &= UndefElts2;
     break;
+  case Instruction::FPTrunc:
+  case Instruction::FPExt:
+    TmpV = SimplifyDemandedVectorElts(I->getOperand(0), DemandedElts,
+                                      UndefElts, Depth+1);
+    if (TmpV) { I->setOperand(0, TmpV); MadeChange = true; }
+    break;
     
   case Instruction::Call: {
     IntrinsicInst *II = dyn_cast<IntrinsicInst>(I);
-- 
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