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Fold TRUNCATE (LOAD P) into a smaller load from P.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19494 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-01-12 02:19:06 +00:00
parent ef6806c979
commit afce4306ec
1 changed files with 15 additions and 0 deletions
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15
lib/Target/X86/X86ISelPattern.cpp
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@ -410,6 +410,7 @@ unsigned ISel::ComputeRegPressure(SDOperand O) {
Result = MaxRegUse+NumExtraMaxRegUsers;
}
//std::cerr << " WEIGHT: " << Result << " "; N->dump(); std::cerr << "\n";
return Result;
}
@ -1106,6 +1107,20 @@ unsigned ISel::SelectExpr(SDOperand N) {
return Result;
}
case ISD::TRUNCATE:
// Fold TRUNCATE (LOAD P) into a smaller load from P.
if (isFoldableLoad(N.getOperand(0))) {
switch (N.getValueType()) {
default: assert(0 && "Unknown truncate!");
case MVT::i1:
case MVT::i8: Opc = X86::MOV8rm; break;
case MVT::i16: Opc = X86::MOV16rm; break;
}
X86AddressMode AM;
EmitFoldedLoad(N.getOperand(0), AM);
addFullAddress(BuildMI(BB, Opc, 4, Result), AM);
return Result;
}
// Handle cast of LARGER int to SMALLER int using a move to EAX followed by
// a move out of AX or AL.
switch (N.getOperand(0).getValueType()) {