Elide pointer to int casts on phi nodes.

Handles the eliding of pointer to integer casts operands of the phi node.

Also caches unelided casts generated in the reader (removing
duplicates within the same block). This reduces the size of
thawed pnacl-llc.pexe by about 2%.

BUG=  https://code.google.com/p/nativeclient/issues/detailid=3544
R=mseaborn@chromium.org

Review URL: https://codereview.chromium.org/22909016

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/Bitcode/NaCl/Writer/NaClValueEnumerator.cpp b/lib/Bitcode/NaCl/Writer/NaClValueEnumerator.cpp
index bee36e2631..060a6d63f4 100644
--- a/lib/Bitcode/NaCl/Writer/NaClValueEnumerator.cpp
+++ b/lib/Bitcode/NaCl/Writer/NaClValueEnumerator.cpp
@@ -479,6 +479,7 @@ static bool ExpectsScalarValue(const Value *V, const Instruction *Arg) {
     switch (I->getOpcode()) {
     default:
       return false;
+    case Instruction::PHI:
     case Instruction::Trunc:
     case Instruction::ZExt:
     case Instruction::SExt:
@@ -497,7 +498,6 @@ static bool ExpectsScalarValue(const Value *V, const Instruction *Arg) {
     // instructions:
     // case Instruction::IntToPtr:
     // case Instruction::BitCast:
-    // case Instruction::PHI:
     // case Instruction::Call:
   }
 }