From: Chris Lattner <sabre@nondot.org>
Date: Sun, 2 Apr 2006 05:37:12 +0000 (+0000)
Subject: Allow transforming this:
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=a1c3538537b853482479222b50810a16be7b04c9;p=oota-llvm.git

Allow transforming this:

        %tmp = cast <4 x uint>* %testData to <4 x int>*         ; <<4 x int>*> [#uses=1]
        %tmp = load <4 x int>* %tmp             ; <<4 x int>> [#uses=1]

to this:

        %tmp = load <4 x uint>* %testData               ; <<4 x uint>> [#uses=1]
        %tmp = cast <4 x uint> %tmp to <4 x int>                ; <<4 x int>> [#uses=1]


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27353 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp
index 3697b2a5148..82e70073e83 100644
--- a/lib/Transforms/Scalar/InstructionCombining.cpp
+++ b/lib/Transforms/Scalar/InstructionCombining.cpp
@@ -6234,7 +6234,8 @@ static Instruction *InstCombineLoadCast(InstCombiner &IC, LoadInst &LI) {
   if (const PointerType *SrcTy = dyn_cast<PointerType>(CastOp->getType())) {
     const Type *SrcPTy = SrcTy->getElementType();
 
-    if (DestPTy->isInteger() || isa<PointerType>(DestPTy)) {
+    if (DestPTy->isInteger() || isa<PointerType>(DestPTy) || 
+        isa<PackedType>(DestPTy)) {
       // If the source is an array, the code below will not succeed.  Check to
       // see if a trivial 'gep P, 0, 0' will help matters.  Only do this for
       // constants.
@@ -6247,7 +6248,8 @@ static Instruction *InstCombineLoadCast(InstCombiner &IC, LoadInst &LI) {
             SrcPTy = SrcTy->getElementType();
           }
 
-      if ((SrcPTy->isInteger() || isa<PointerType>(SrcPTy)) &&
+      if ((SrcPTy->isInteger() || isa<PointerType>(SrcPTy) || 
+           isa<PackedType>(SrcPTy)) &&
           // Do not allow turning this into a load of an integer, which is then
           // casted to a pointer, this pessimizes pointer analysis a lot.
           (isa<PointerType>(SrcPTy) == isa<PointerType>(LI.getType())) &&