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Add (untested) support for MULHS and MULHU.

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llvm-svn: 21107
This commit is contained in:
Chris Lattner 2005-04-06 04:21:07 +00:00
parent ba7cdbebb1
commit c87ff88efb
1 changed files with 51 additions and 0 deletions
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51
lib/Target/X86/X86ISelPattern.cpp
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@ -1818,6 +1818,57 @@ unsigned ISel::SelectExpr(SDOperand N) {
BuildMI(BB, X86::FCHS, 1, Result).addReg(Tmp1);
return Result;
case ISD::MULHU:
switch (N.getValueType()) {
default: assert(0 && "Unsupported VT!");
case MVT::i8: Tmp2 = X86::MUL8r; break;
case MVT::i16: Tmp2 = X86::MUL16r; break;
case MVT::i32: Tmp2 = X86::MUL32r; break;
}
// FALL THROUGH
case ISD::MULHS: {
unsigned MovOpc, LowReg, HiReg;
switch (N.getValueType()) {
default: assert(0 && "Unsupported VT!");
case MVT::i8:
MovOpc = X86::MOV8rr;
LowReg = X86::AL;
HiReg = X86::AH;
Opc = X86::IMUL8r;
break;
case MVT::i16:
MovOpc = X86::MOV16rr;
LowReg = X86::AX;
HiReg = X86::DX;
Opc = X86::IMUL16r;
break;
case MVT::i32:
MovOpc = X86::MOV32rr;
LowReg = X86::EAX;
HiReg = X86::EDX;
Opc = X86::IMUL32r;
break;
}
if (Node->getOpcode() != ISD::MULHS)
Opc = Tmp2; // Get the MULHU opcode.
Op0 = Node->getOperand(0);
Op1 = Node->getOperand(1);
if (getRegPressure(Op0) > getRegPressure(Op1)) {
Tmp1 = SelectExpr(Op0);
Tmp2 = SelectExpr(Op1);
} else {
Tmp2 = SelectExpr(Op1);
Tmp1 = SelectExpr(Op0);
}
// FIXME: Implement folding of loads into the memory operands here!
BuildMI(BB, MovOpc, 1, LowReg).addReg(Tmp1);
BuildMI(BB, Opc, 1).addReg(Tmp2);
BuildMI(BB, MovOpc, 1, Result).addReg(HiReg);
return Result;
}
case ISD::SUB:
case ISD::MUL:
case ISD::AND: