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

[Chris Lattner]

Changes in directory llvm/lib/Transforms/Scalar:

InstructionCombining.cpp updated: 1.332 -> 1.333
---
Log message:

Implement getelementptr.ll:test11


---
Diffs of the changes:  (+16 -0)

 InstructionCombining.cpp |   16 ++++++++++++++++
 1 files changed, 16 insertions(+)


Index: llvm/lib/Transforms/Scalar/InstructionCombining.cpp
diff -u llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.332 llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.333
--- llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.332	Sat Apr 30 23:24:53 2005
+++ llvm/lib/Transforms/Scalar/InstructionCombining.cpp	Sat Apr 30 23:42:15 2005
@@ -2879,6 +2879,22 @@
   if (Constant *RHSC = dyn_cast<Constant>(Op1)) {
     if (Instruction *LHSI = dyn_cast<Instruction>(Op0))
       switch (LHSI->getOpcode()) {
+      case Instruction::GetElementPtr:
+        if (RHSC->isNullValue()) {
+          // Transform setcc GEP P, int 0, int 0, int 0, null -> setcc P, null
+          bool isAllZeros = true;
+          for (unsigned i = 1, e = LHSI->getNumOperands(); i != e; ++i)
+            if (!isa<Constant>(LHSI->getOperand(i)) ||
+                !cast<Constant>(LHSI->getOperand(i))->isNullValue()) {
+              isAllZeros = false;
+              break;
+            }
+          if (isAllZeros)
+            return new SetCondInst(I.getOpcode(), LHSI->getOperand(0),
+                    Constant::getNullValue(LHSI->getOperand(0)->getType()));
+        }
+        break;
+
       case Instruction::PHI:
         if (Instruction *NV = FoldOpIntoPhi(I))
           return NV;