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Add knowledge about the struct form of the GetElementPtr instruction

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llvm-svn: 183
This commit is contained in:
Chris Lattner 2001-07-14 06:11:51 +00:00
parent 10ff90d678
commit a969eb234b
1 changed files with 7 additions and 1 deletions
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8
lib/Transforms/Scalar/SCCP.cpp
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@ -23,6 +23,7 @@
#include "llvm/ConstantPool.h"
#include "llvm/InstrTypes.h"
#include "llvm/iOther.h"
#include "llvm/iMemory.h"
#include "llvm/iTerminators.h"
#include "llvm/Tools/STLExtras.h"
#include "llvm/Assembly/Writer.h"
@ -429,8 +430,13 @@ void SCCP::UpdateInstruction(Instruction *I) {
//===-------------------------------------------------------------------===//
// Handle Unary instructions...
// Also treated as unary here, are cast instructions and getelementptr
// instructions on struct* operands.
//
if (I->isUnaryOp() || I->getOpcode() == Instruction::Cast) {
if (I->isUnaryOp() || I->getOpcode() == Instruction::Cast ||
(I->getOpcode() == Instruction::GetElementPtr &&
((GetElementPtrInst*)I)->isStructSelector())) {
Value *V = I->getOperand(0);
InstVal &VState = getValueState(V);
if (VState.isOverdefined()) { // Inherit overdefinedness of operand