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X86FastISel support for double->float and float->double casts. 

llvm-svn: 56070
This commit is contained in:
Dan Gohman 2008-09-10 21:02:08 +00:00
parent 1dc9b0514f
commit bf646f2986
1 changed files with 43 additions and 0 deletions
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43
llvm/lib/Target/X86/X86FastISel.cpp
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@ -92,6 +92,9 @@ private:
bool X86SelectTrunc(Instruction *I);
bool X86SelectFPExt(Instruction *I);
bool X86SelectFPTrunc(Instruction *I);
bool X86SelectCall(Instruction *I);
CCAssignFn *CCAssignFnForCall(unsigned CC, bool isTailCall = false);
@ -656,6 +659,42 @@ bool X86FastISel::X86SelectSelect(Instruction *I) {
return true;
}
bool X86FastISel::X86SelectFPExt(Instruction *I) {
if (Subtarget->hasSSE2()) {
if (I->getType() == Type::DoubleTy) {
Value *V = I->getOperand(0);
if (V->getType() == Type::FloatTy) {
unsigned OpReg = getRegForValue(V);
if (OpReg == 0) return false;
unsigned ResultReg = createResultReg(X86::FR64RegisterClass);
BuildMI(MBB, TII.get(X86::CVTSS2SDrr), ResultReg).addReg(OpReg);
UpdateValueMap(I, ResultReg);
return true;
}
}
}
return false;
}
bool X86FastISel::X86SelectFPTrunc(Instruction *I) {
if (Subtarget->hasSSE2()) {
if (I->getType() == Type::FloatTy) {
Value *V = I->getOperand(0);
if (V->getType() == Type::DoubleTy) {
unsigned OpReg = getRegForValue(V);
if (OpReg == 0) return false;
unsigned ResultReg = createResultReg(X86::FR32RegisterClass);
BuildMI(MBB, TII.get(X86::CVTSD2SSrr), ResultReg).addReg(OpReg);
UpdateValueMap(I, ResultReg);
return true;
}
}
}
return false;
}
bool X86FastISel::X86SelectTrunc(Instruction *I) {
if (Subtarget->is64Bit())
// All other cases should be handled by the tblgen generated code.
@ -937,6 +976,10 @@ X86FastISel::TargetSelectInstruction(Instruction *I) {
return X86SelectSelect(I);
case Instruction::Trunc:
return X86SelectTrunc(I);
case Instruction::FPExt:
return X86SelectFPExt(I);
case Instruction::FPTrunc:
return X86SelectFPTrunc(I);
}
return false;