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add some code to support cross-register class copying from 

RST -> RFP{32/64/80}.  We only handle ST(0) for now.

llvm-svn: 48104
This commit is contained in:
Chris Lattner 2008-03-09 08:46:19 +00:00
parent aa6f5c9ddd
commit b79bafcec8
1 changed files with 22 additions and 4 deletions
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26
llvm/lib/Target/X86/X86InstrInfo.cpp
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@ -1400,10 +1400,10 @@ X86InstrInfo::InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
}
void X86InstrInfo::copyRegToReg(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
unsigned DestReg, unsigned SrcReg,
const TargetRegisterClass *DestRC,
const TargetRegisterClass *SrcRC) const {
MachineBasicBlock::iterator MI,
unsigned DestReg, unsigned SrcReg,
const TargetRegisterClass *DestRC,
const TargetRegisterClass *SrcRC) const {
if (DestRC == SrcRC) {
unsigned Opc;
if (DestRC == &X86::GR64RegClass) {
@ -1464,6 +1464,24 @@ void X86InstrInfo::copyRegToReg(MachineBasicBlock &MBB,
return;
}
}
// Moving ST(0) to/from a register turns into FpGET_ST0_32 etc.
if (SrcRC == &X86::RSTRegClass) {
// Copying from ST(0). FIXME: handle ST(1) also
assert(SrcReg == X86::ST0 && "Can only copy from TOS right now");
unsigned Opc;
if (DestRC == &X86::RFP32RegClass)
Opc = X86::FpGET_ST0_32;
else if (DestRC == &X86::RFP64RegClass)
Opc = X86::FpGET_ST0_64;
else {
assert(DestRC == &X86::RFP80RegClass);
Opc = X86::FpGET_ST0_80;
}
BuildMI(MBB, MI, get(Opc), DestReg);
return;
}
cerr << "Not yet supported!";
abort();
}