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Provide size information when checking to see if we can LICM a load, this
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
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@ -170,9 +170,9 @@ namespace {
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/// pointerInvalidatedByLoop - Return true if the body of this loop may
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/// store into the memory location pointed to by V.
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///
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bool pointerInvalidatedByLoop(Value *V) {
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bool pointerInvalidatedByLoop(Value *V, unsigned Size) {
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// Check to see if any of the basic blocks in CurLoop invalidate *V.
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return CurAST->getAliasSetForPointer(V, 0).isMod();
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return CurAST->getAliasSetForPointer(V, Size).isMod();
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}
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bool canSinkOrHoistInst(Instruction &I);
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@ -351,7 +351,10 @@ bool LICM::canSinkOrHoistInst(Instruction &I) {
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return false; // Don't hoist volatile loads!
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// Don't hoist loads which have may-aliased stores in loop.
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return !pointerInvalidatedByLoop(LI->getOperand(0));
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unsigned Size = 0;
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if (LI->getType()->isSized())
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Size = AA->getTargetData().getTypeSize(LI->getType());
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return !pointerInvalidatedByLoop(LI->getOperand(0), Size);
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} else if (CallInst *CI = dyn_cast<CallInst>(&I)) {
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// Handle obvious cases efficiently.
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if (Function *Callee = CI->getCalledFunction()) {
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