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Provide size information when checking to see if we can LICM a load, this

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allows us to hoist more loads in some cases.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18265 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-11-26 21:20:09 +00:00
parent 1ed80b66b1
commit f3e1d6977e
1 changed files with 6 additions and 3 deletions
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9
lib/Transforms/Scalar/LICM.cpp
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@ -170,9 +170,9 @@ namespace {
/// pointerInvalidatedByLoop - Return true if the body of this loop may
/// store into the memory location pointed to by V.
///
bool pointerInvalidatedByLoop(Value *V) {
bool pointerInvalidatedByLoop(Value *V, unsigned Size) {
// Check to see if any of the basic blocks in CurLoop invalidate *V.
return CurAST->getAliasSetForPointer(V, 0).isMod();
return CurAST->getAliasSetForPointer(V, Size).isMod();
}
bool canSinkOrHoistInst(Instruction &I);
@ -351,7 +351,10 @@ bool LICM::canSinkOrHoistInst(Instruction &I) {
return false; // Don't hoist volatile loads!
// Don't hoist loads which have may-aliased stores in loop.
return !pointerInvalidatedByLoop(LI->getOperand(0));
unsigned Size = 0;
if (LI->getType()->isSized())
Size = AA->getTargetData().getTypeSize(LI->getType());
return !pointerInvalidatedByLoop(LI->getOperand(0), Size);
} else if (CallInst *CI = dyn_cast<CallInst>(&I)) {
// Handle obvious cases efficiently.
if (Function *Callee = CI->getCalledFunction()) {