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Set up the shift and setcc types.

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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
This commit is contained in:
Chris Lattner 2005-01-17 00:00:33 +00:00
parent 714b69d047
commit 4df0de975a
1 changed files with 32 additions and 1 deletions
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33
lib/Target/X86/X86ISelPattern.cpp
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@ -39,6 +39,12 @@ namespace {
public:
X86TargetLowering(TargetMachine &TM) : TargetLowering(TM) {
// Set up the TargetLowering object.
// X86 is wierd, it always uses i8 for shift amounts and setcc results.
setShiftAmountType(MVT::i8);
setSetCCResultType(MVT::i8);
// Set up the register classes.
addRegisterClass(MVT::i8, X86::R8RegisterClass);
addRegisterClass(MVT::i16, X86::R16RegisterClass);
addRegisterClass(MVT::i32, X86::R32RegisterClass);
@ -2303,10 +2309,35 @@ void ISel::Select(SDOperand N) {
return;
}
case ISD::LOAD:
// If this load could be folded into the only using instruction, and if it
// is safe to emit the instruction here, try to do so now.
if (Node->hasNUsesOfValue(1, 0)) {
SDOperand TheVal = N.getValue(0);
SDNode *User = 0;
for (SDNode::use_iterator UI = Node->use_begin(); ; ++UI) {
assert(UI != Node->use_end() && "Didn't find use!");
SDNode *UN = *UI;
for (unsigned i = 0, e = UN->getNumOperands(); i != e; ++i)
if (UN->getOperand(i) == TheVal) {
User = UN;
goto FoundIt;
}
}
FoundIt:
// Only handle unary operators right now.
if (User->getNumOperands() == 1) {
LoweredTokens.erase(N);
SelectExpr(SDOperand(User, 0));
return;
}
}
SelectExpr(N);
return;
case ISD::EXTLOAD:
case ISD::SEXTLOAD:
case ISD::ZEXTLOAD:
case ISD::LOAD:
case ISD::CALL:
case ISD::DYNAMIC_STACKALLOC:
SelectExpr(N);