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Fix the: test/Regression/Other/2002-03-20-LevelRaiseCrash.ll bug. It turned 

out that almost always the result of the add was the same as the GEP that
would be generated.  In this case, however, it wasn't, so bad things happened.

llvm-svn: 1929
This commit is contained in:
Chris Lattner 2002-03-21 06:22:23 +00:00
parent 261df367e0
commit 0d984ef719
1 changed files with 24 additions and 5 deletions
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29
llvm/lib/Transforms/LevelRaise.cpp
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@ -62,6 +62,7 @@ static inline bool isReinterpretingCast(const CastInst *CI) {
static bool HandleCastToPointer(BasicBlock::iterator BI,
const PointerType *DestPTy) {
CastInst *CI = cast<CastInst>(*BI);
if (CI->use_empty()) return false;
// Scan all of the uses, looking for any uses that are not add
// instructions. If we have non-adds, do not make this transformation.
@ -86,18 +87,36 @@ static bool HandleCastToPointer(BasicBlock::iterator BI,
// If we have a getelementptr capability... transform all of the
// add instruction uses into getelementptr's.
while (!CI->use_empty()) {
Instruction *I = cast<Instruction>(*CI->use_begin());
BinaryOperator *I = cast<BinaryOperator>(*CI->use_begin());
assert(I->getOpcode() == Instruction::Add && I->getNumOperands() == 2 &&
"Use is not a valid add instruction!");
// Get the value added to the cast result pointer...
Value *OtherPtr = I->getOperand((I->getOperand(0) == CI) ? 1 : 0);
GetElementPtrInst *GEP = new GetElementPtrInst(OtherPtr, Indices);
Instruction *GEP = new GetElementPtrInst(OtherPtr, Indices, I->getName());
PRINT_PEEPHOLE1("cast-add-to-gep:i", I);
// Replace the old add instruction with the shiny new GEP inst
ReplaceInstWithInst(I, GEP);
if (GEP->getType() == I->getType()) {
// Replace the old add instruction with the shiny new GEP inst
ReplaceInstWithInst(I, GEP);
} else {
// If the type produced by the gep instruction differs from the original
// add instruction type, insert a cast now.
//
// Insert the GEP instruction before the old add instruction... and get an
// iterator to point at the add instruction...
BasicBlock::iterator GEPI = InsertInstBeforeInst(GEP, I)+1;
PRINT_PEEPHOLE1("cast-add-to-gep:o", GEP);
CastInst *CI = new CastInst(GEP, I->getType());
GEP = CI;
// Replace the old add instruction with the shiny new GEP inst
ReplaceInstWithInst(I->getParent()->getInstList(), GEPI, GEP);
}
PRINT_PEEPHOLE1("cast-add-to-gep:o", GEP);
}
return true;