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fp to int and back conversion sequences

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19944 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Lenharth 2005-01-31 01:44:26 +00:00
parent 613233230b
commit 7efadce56e
2 changed files with 34 additions and 14 deletions
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46
lib/Target/Alpha/AlphaISelPattern.cpp
View File

@ -412,6 +412,7 @@ unsigned ISel::SelectExprFP(SDOperand N, unsigned Result)
{
assert (N.getOperand(0).getValueType() == MVT::i64 && "only quads can be loaded from");
Tmp1 = SelectExpr(N.getOperand(0)); // Get the operand register
Tmp2 = MakeReg(MVT::f64);
//The hard way:
// Spill the integer to memory and reload it from there.
@ -419,12 +420,10 @@ unsigned ISel::SelectExprFP(SDOperand N, unsigned Result)
MachineFunction *F = BB->getParent();
int FrameIdx = F->getFrameInfo()->CreateStackObject(Size, Size);
//STL LDS
//STQ LDT
Opc = DestType == MVT::f64 ? Alpha::STQ : Alpha::STL;
BuildMI(BB, Opc, 2).addReg(Tmp1).addFrameIndex(FrameIdx).addReg(Alpha::F31);
Opc = DestType == MVT::f64 ? Alpha::LDT : Alpha::LDS;
BuildMI(BB, Opc, 1, Result).addFrameIndex(FrameIdx).addReg(Alpha::F31);
BuildMI(BB, Alpha::STQ, 3).addReg(Tmp1).addFrameIndex(FrameIdx).addReg(Alpha::F31);
BuildMI(BB, Alpha::LDT, 2, Tmp2).addFrameIndex(FrameIdx).addReg(Alpha::F31);
Opc = DestType == MVT::f64 ? Alpha::CVTQT : Alpha::CVTQS;
BuildMI(BB, Opc, 1, Result).addReg(Tmp2);
//The easy way: doesn't work
// //so these instructions are not supported on ev56
@ -965,13 +964,34 @@ unsigned ISel::SelectExpr(SDOperand N) {
return Result;
// // case ISD::UINT_TO_FP:
// case ISD::FP_TO_SINT:
// assert (N.getValueType() == MVT::f64 && "Only can convert for doubles");
// Tmp1 = SelectExpr(N.getOperand(0)); // Get the operand register
// Tmp2 = MakeReg(SrcTy);
// BuildMI(BB, CVTTQ, 1, Tmp2).addReg(Tmp1);
// BuildMI(BB, FTOIT, 1, Result).addReg(Tmp2);
// return result;
case ISD::FP_TO_SINT:
{
assert (DestType == MVT::i64 && "only quads can be loaded to");
MVT::ValueType SrcType = N.getOperand(0).getValueType();
Tmp1 = SelectExpr(N.getOperand(0)); // Get the operand register
//The hard way:
// Spill the integer to memory and reload it from there.
unsigned Size = MVT::getSizeInBits(MVT::f64)/8;
MachineFunction *F = BB->getParent();
int FrameIdx = F->getFrameInfo()->CreateStackObject(Size, 8);
//CVTTQ STT LDQ
//CVTST CVTTQ STT LDQ
if (SrcType == MVT::f32)
{
Tmp2 = MakeReg(MVT::f64);
BuildMI(BB, Alpha::CVTST, 1, Tmp2).addReg(Tmp1);
Tmp1 = Tmp2;
}
Tmp2 = MakeReg(MVT::f64);
BuildMI(BB, Alpha::CVTTQ, 1, Tmp2).addReg(Tmp1);
BuildMI(BB, Alpha::STT, 3).addReg(Tmp2).addFrameIndex(FrameIdx).addReg(Alpha::F31);
BuildMI(BB, Alpha::LDQ, 2, Result).addFrameIndex(FrameIdx).addReg(Alpha::F31);
return Result;
}
// // case ISD::FP_TO_UINT:

2
lib/Target/Alpha/AlphaInstrInfo.td
View File

@ -331,7 +331,7 @@ def ITOFT : FPForm<0x14, 0x024, (ops FPRC:$RC, GPRC:$RA), "itoft $RA,$RC">; //In
def CVTQS : FPForm<0x16, 0x0BC, (ops FPRC:$RC, FPRC:$RA), "cvtqs $RA,$RC">; //Convert quadword to S_floating
def CVTQT : FPForm<0x16, 0x0BE, (ops FPRC:$RC, FPRC:$RA), "cvtqt $RA,$RC">; //Convert quadword to T_floating
def CVTST : FPForm<0x16, 0x2AC, (ops FPRC:$RC, FPRC:$RA), "cvtst $RA,$RC">; //Convert S_floating to T_floating
//CVTTQ F-P 16.0AF Convert T_floating to quadword
def CVTTQ : FPForm<0x16, 0x0AF, (ops FPRC:$RC, FPRC:$RA), "cvttq $RA,$RC">; //Convert T_floating to quadword
def CVTTS : FPForm<0x16, 0x2AC, (ops FPRC:$RC, FPRC:$RA), "cvtts $RA,$RC">; //Convert T_floating to S_floating
//S_floating : IEEE Single