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Set up the shift and setcc types.
If we emit a load because we followed a token chain to get to it, try to fold it into its single user if possible. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19620 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -39,6 +39,12 @@ namespace {
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public:
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X86TargetLowering(TargetMachine &TM) : TargetLowering(TM) {
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// Set up the TargetLowering object.
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// X86 is wierd, it always uses i8 for shift amounts and setcc results.
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setShiftAmountType(MVT::i8);
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setSetCCResultType(MVT::i8);
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// Set up the register classes.
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addRegisterClass(MVT::i8, X86::R8RegisterClass);
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addRegisterClass(MVT::i16, X86::R16RegisterClass);
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addRegisterClass(MVT::i32, X86::R32RegisterClass);
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@ -2303,10 +2309,35 @@ void ISel::Select(SDOperand N) {
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return;
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}
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case ISD::LOAD:
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// If this load could be folded into the only using instruction, and if it
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// is safe to emit the instruction here, try to do so now.
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if (Node->hasNUsesOfValue(1, 0)) {
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SDOperand TheVal = N.getValue(0);
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SDNode *User = 0;
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for (SDNode::use_iterator UI = Node->use_begin(); ; ++UI) {
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assert(UI != Node->use_end() && "Didn't find use!");
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SDNode *UN = *UI;
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for (unsigned i = 0, e = UN->getNumOperands(); i != e; ++i)
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if (UN->getOperand(i) == TheVal) {
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User = UN;
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goto FoundIt;
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}
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}
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FoundIt:
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// Only handle unary operators right now.
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if (User->getNumOperands() == 1) {
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LoweredTokens.erase(N);
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SelectExpr(SDOperand(User, 0));
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return;
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}
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}
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SelectExpr(N);
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return;
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case ISD::EXTLOAD:
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case ISD::SEXTLOAD:
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case ISD::ZEXTLOAD:
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case ISD::LOAD:
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case ISD::CALL:
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case ISD::DYNAMIC_STACKALLOC:
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SelectExpr(N);
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