[llvm-commits] CVS: llvm/lib/Transforms/Scalar/InstructionCombining.cpp

[Chris Lattner]

Changes in directory llvm/lib/Transforms/Scalar:

InstructionCombining.cpp updated: 1.189 -> 1.190

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Log message:

ADd a trivial instcombine: load null -> null


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Diffs of the changes:  (+5 -2)

Index: llvm/lib/Transforms/Scalar/InstructionCombining.cpp
diff -u llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.189 llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.190
--- llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.189	Sat Apr 10 20:39:19 2004
+++ llvm/lib/Transforms/Scalar/InstructionCombining.cpp	Tue Apr 13 22:28:36 2004
@@ -2853,8 +2853,11 @@
   Value *Op = LI.getOperand(0);
   if (LI.isVolatile()) return 0;
 
-  if (ConstantPointerRef *CPR = dyn_cast<ConstantPointerRef>(Op))
-    Op = CPR->getValue();
+  if (Constant *C = dyn_cast<Constant>(Op))
+    if (C->isNullValue())  // load null -> 0
+      return ReplaceInstUsesWith(LI, Constant::getNullValue(LI.getType()));
+    else if (ConstantPointerRef *CPR = dyn_cast<ConstantPointerRef>(C))
+      Op = CPR->getValue();
 
   // Instcombine load (constant global) into the value loaded...
   if (GlobalVariable *GV = dyn_cast<GlobalVariable>(Op))