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Do not fold loads into instructions if it is used more than once. In particular

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we do not want to fold the load in cases like this:

  X = load
    = add A, X
    = add B, X


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14204 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-06-17 22:15:25 +00:00
parent 5253f05709
commit ccd9796a46
2 changed files with 4 additions and 2 deletions
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3
lib/Target/X86/InstSelectSimple.cpp
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@ -1964,11 +1964,12 @@ void ISel::visitSimpleBinary(BinaryOperator &B, unsigned OperatorClass) {
// Special case: op Reg, load [mem] // Special case: op Reg, load [mem]
if (isa<LoadInst>(Op0) && !isa<LoadInst>(Op1) && Class != cLong && if (isa<LoadInst>(Op0) && !isa<LoadInst>(Op1) && Class != cLong &&
Op0->hasOneUse() &&
isSafeToFoldLoadIntoInstruction(*cast<LoadInst>(Op0), B)) isSafeToFoldLoadIntoInstruction(*cast<LoadInst>(Op0), B))
if (!B.swapOperands()) if (!B.swapOperands())
std::swap(Op0, Op1); // Make sure any loads are in the RHS. std::swap(Op0, Op1); // Make sure any loads are in the RHS.
if (isa<LoadInst>(Op1) && Class != cLong && if (isa<LoadInst>(Op1) && Class != cLong && Op1->hasOneUse() &&
isSafeToFoldLoadIntoInstruction(*cast<LoadInst>(Op1), B)) { isSafeToFoldLoadIntoInstruction(*cast<LoadInst>(Op1), B)) {
unsigned Opcode; unsigned Opcode;

3
lib/Target/X86/X86ISelSimple.cpp
View File

@ -1964,11 +1964,12 @@ void ISel::visitSimpleBinary(BinaryOperator &B, unsigned OperatorClass) {
// Special case: op Reg, load [mem] // Special case: op Reg, load [mem]
if (isa<LoadInst>(Op0) && !isa<LoadInst>(Op1) && Class != cLong && if (isa<LoadInst>(Op0) && !isa<LoadInst>(Op1) && Class != cLong &&
Op0->hasOneUse() &&
isSafeToFoldLoadIntoInstruction(*cast<LoadInst>(Op0), B)) isSafeToFoldLoadIntoInstruction(*cast<LoadInst>(Op0), B))
if (!B.swapOperands()) if (!B.swapOperands())
std::swap(Op0, Op1); // Make sure any loads are in the RHS. std::swap(Op0, Op1); // Make sure any loads are in the RHS.
if (isa<LoadInst>(Op1) && Class != cLong && if (isa<LoadInst>(Op1) && Class != cLong && Op1->hasOneUse() &&
isSafeToFoldLoadIntoInstruction(*cast<LoadInst>(Op1), B)) { isSafeToFoldLoadIntoInstruction(*cast<LoadInst>(Op1), B)) {
unsigned Opcode; unsigned Opcode;