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Remove implicit information from instruction selector 

llvm-svn: 4811
This commit is contained in:
Chris Lattner 2002-11-21 18:54:29 +00:00
parent e8885d949a
commit cf7c225e06
1 changed files with 2 additions and 6 deletions
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8
llvm/lib/Target/X86/InstSelectSimple.cpp
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@ -398,12 +398,10 @@ void ISel::visitMul(BinaryOperator &I) {
visitInstruction(I);
static const unsigned Regs[] ={ X86::AL , X86::AX , X86::EAX };
static const unsigned Clobbers[] ={ X86::AH , X86::DX , X86::EDX };
static const unsigned MulOpcode[]={ X86::MULrr8, X86::MULrr16, X86::MULrr32 };
static const unsigned MovOpcode[]={ X86::MOVrr8, X86::MOVrr16, X86::MOVrr32 };
unsigned Reg = Regs[Class];
unsigned Clobber = Clobbers[Class];
unsigned Op0Reg = getReg(I.getOperand(0));
unsigned Op1Reg = getReg(I.getOperand(1));
@ -411,8 +409,7 @@ void ISel::visitMul(BinaryOperator &I) {
BuildMI(BB, MovOpcode[Class], 1, Reg).addReg(Op0Reg);
// Emit the appropriate multiply instruction...
BuildMI(BB, MulOpcode[Class], 3)
.addReg(Reg, UseAndDef).addReg(Op1Reg).addClobber(Clobber);
BuildMI(BB, MulOpcode[Class], 1).addReg(Op1Reg);
// Put the result into the destination register...
BuildMI(BB, MovOpcode[Class], 1, getReg(I)).addReg(Reg);
@ -458,8 +455,7 @@ void ISel::visitDivRem(BinaryOperator &I) {
}
// Emit the appropriate divide or remainder instruction...
BuildMI(BB, DivOpcode[isSigned][Class], 2)
.addReg(Reg, UseAndDef).addReg(ExtReg, UseAndDef).addReg(Op1Reg);
BuildMI(BB, DivOpcode[isSigned][Class], 1).addReg(Op1Reg);
// Figure out which register we want to pick the result out of...
unsigned DestReg = (I.getOpcode() == Instruction::Div) ? Reg : ExtReg;