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llvm-svn: 106408
This commit is contained in:
Rafael Espindola 2010-06-21 02:17:34 +00:00
parent 8a4ebbc2a6
commit 84260ed15a
1 changed files with 49 additions and 34 deletions
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83
lib/Target/X86/X86InstrInfo.cpp
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@ -1890,6 +1890,26 @@ static bool isHReg(unsigned Reg) {
return X86::GR8_ABCD_HRegClass.contains(Reg);
}
static const TargetRegisterClass *findCommonRC(const TargetRegisterClass *a,
const TargetRegisterClass *b) {
if (a == b)
return a;
if (a->hasSuperClass(b))
return b;
if (b->hasSuperClass(a))
return a;
for (TargetRegisterClass::sc_iterator i = a->superclasses_begin(),
e = a->superclasses_end();
i != e;
++i) {
const TargetRegisterClass *s = *i;
if (b->hasSuperClass(s))
return s;
}
return NULL;
}
bool X86InstrInfo::copyRegToReg(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
unsigned DestReg, unsigned SrcReg,
@ -1898,24 +1918,7 @@ bool X86InstrInfo::copyRegToReg(MachineBasicBlock &MBB,
DebugLoc DL) const {
// Determine if DstRC and SrcRC have a common superclass in common.
const TargetRegisterClass *CommonRC = DestRC;
if (DestRC == SrcRC)
/* Source and destination have the same register class. */;
else if (CommonRC->hasSuperClass(SrcRC))
CommonRC = SrcRC;
else if (!DestRC->hasSubClass(SrcRC)) {
// Neither of GR64_NOREX or GR64_NOSP is a superclass of the other,
// but we want to copy them as GR64. Similarly, for GR32_NOREX and
// GR32_NOSP, copy as GR32.
if (SrcRC->hasSuperClass(&X86::GR64RegClass) &&
DestRC->hasSuperClass(&X86::GR64RegClass))
CommonRC = &X86::GR64RegClass;
else if (SrcRC->hasSuperClass(&X86::GR32RegClass) &&
DestRC->hasSuperClass(&X86::GR32RegClass))
CommonRC = &X86::GR32RegClass;
else
CommonRC = 0;
}
const TargetRegisterClass *CommonRC = findCommonRC(SrcRC, DestRC);
if (CommonRC) {
unsigned Opc;
@ -1981,29 +1984,41 @@ bool X86InstrInfo::copyRegToReg(MachineBasicBlock &MBB,
return true;
}
if (X86::RSTRegClass.contains(SrcReg))
CommonRC = DestRC;
else if (X86::RSTRegClass.contains(DestReg))
CommonRC = SrcRC;
else if (X86::CCRRegClass.contains(SrcReg))
CommonRC = DestRC;
else if (X86::CCRRegClass.contains(DestReg))
CommonRC = SrcRC;
if (!CommonRC)
return false;
// Moving EFLAGS to / from another register requires a push and a pop.
if (SrcRC == &X86::CCRRegClass) {
if (X86::CCRRegClass.contains(SrcReg)) {
if (SrcReg != X86::EFLAGS)
return false;
if (DestRC == &X86::GR64RegClass || DestRC == &X86::GR64_NOSPRegClass) {
if (CommonRC == &X86::GR64RegClass || CommonRC == &X86::GR64_NOSPRegClass) {
BuildMI(MBB, MI, DL, get(X86::PUSHF64));
BuildMI(MBB, MI, DL, get(X86::POP64r), DestReg);
return true;
} else if (DestRC == &X86::GR32RegClass ||
DestRC == &X86::GR32_NOSPRegClass) {
} else if (CommonRC == &X86::GR32RegClass ||
CommonRC == &X86::GR32_NOSPRegClass) {
BuildMI(MBB, MI, DL, get(X86::PUSHF32));
BuildMI(MBB, MI, DL, get(X86::POP32r), DestReg);
return true;
}
} else if (DestRC == &X86::CCRRegClass) {
} else if (X86::CCRRegClass.contains(DestReg)) {
if (DestReg != X86::EFLAGS)
return false;
if (SrcRC == &X86::GR64RegClass || DestRC == &X86::GR64_NOSPRegClass) {
if (CommonRC == &X86::GR64RegClass || CommonRC == &X86::GR64_NOSPRegClass) {
BuildMI(MBB, MI, DL, get(X86::PUSH64r)).addReg(SrcReg);
BuildMI(MBB, MI, DL, get(X86::POPF64));
return true;
} else if (SrcRC == &X86::GR32RegClass ||
DestRC == &X86::GR32_NOSPRegClass) {
} else if (CommonRC == &X86::GR32RegClass ||
CommonRC == &X86::GR32_NOSPRegClass) {
BuildMI(MBB, MI, DL, get(X86::PUSH32r)).addReg(SrcReg);
BuildMI(MBB, MI, DL, get(X86::POPF32));
return true;
@ -2011,19 +2026,19 @@ bool X86InstrInfo::copyRegToReg(MachineBasicBlock &MBB,
}
// Moving from ST(0) turns into FpGET_ST0_32 etc.
if (SrcRC == &X86::RSTRegClass) {
if (X86::RSTRegClass.contains(SrcReg)) {
// Copying from ST(0)/ST(1).
if (SrcReg != X86::ST0 && SrcReg != X86::ST1)
// Can only copy from ST(0)/ST(1) right now
return false;
bool isST0 = SrcReg == X86::ST0;
unsigned Opc;
if (DestRC == &X86::RFP32RegClass)
if (CommonRC == &X86::RFP32RegClass)
Opc = isST0 ? X86::FpGET_ST0_32 : X86::FpGET_ST1_32;
else if (DestRC == &X86::RFP64RegClass)
else if (CommonRC == &X86::RFP64RegClass)
Opc = isST0 ? X86::FpGET_ST0_64 : X86::FpGET_ST1_64;
else {
if (DestRC != &X86::RFP80RegClass)
if (CommonRC != &X86::RFP80RegClass)
return false;
Opc = isST0 ? X86::FpGET_ST0_80 : X86::FpGET_ST1_80;
}
@ -2032,19 +2047,19 @@ bool X86InstrInfo::copyRegToReg(MachineBasicBlock &MBB,
}
// Moving to ST(0) turns into FpSET_ST0_32 etc.
if (DestRC == &X86::RSTRegClass) {
if (X86::RSTRegClass.contains(DestReg)) {
// Copying to ST(0) / ST(1).
if (DestReg != X86::ST0 && DestReg != X86::ST1)
// Can only copy to TOS right now
return false;
bool isST0 = DestReg == X86::ST0;
unsigned Opc;
if (SrcRC == &X86::RFP32RegClass)
if (CommonRC == &X86::RFP32RegClass)
Opc = isST0 ? X86::FpSET_ST0_32 : X86::FpSET_ST1_32;
else if (SrcRC == &X86::RFP64RegClass)
else if (CommonRC == &X86::RFP64RegClass)
Opc = isST0 ? X86::FpSET_ST0_64 : X86::FpSET_ST1_64;
else {
if (SrcRC != &X86::RFP80RegClass)
if (CommonRC != &X86::RFP80RegClass)
return false;
Opc = isST0 ? X86::FpSET_ST0_80 : X86::FpSET_ST1_80;
}