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implement proper PPC64 prolog/epilog codegen.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31684 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-11-11 19:05:28 +00:00
parent dc31a8a70c
commit a94a203f34
2 changed files with 81 additions and 30 deletions
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5
lib/Target/PowerPC/PPCInstr64Bit.td
View File

@ -322,6 +322,10 @@ def STDX : XForm_8<31, 149, (ops G8RC:$rS, memrr:$dst),
"stdx $rS, $dst", LdStSTD,
[(store G8RC:$rS, xaddr:$dst)]>, isPPC64,
PPC970_DGroup_Cracked;
def STDU : DSForm_1<62, 1, (ops G8RC:$rS, memrix:$dst),
"stdu $rS, $dst", LdStSTD,
[]>, isPPC64;
def STDUX : XForm_8<31, 181, (ops G8RC:$rS, memrr:$dst),
"stdux $rS, $dst", LdStSTD,
[]>, isPPC64;
@ -335,6 +339,7 @@ def STDX_32 : XForm_8<31, 149, (ops GPRC:$rT, memrr:$dst),
[(PPCstd_32 GPRC:$rT, xaddr:$dst)]>, isPPC64,
PPC970_DGroup_Cracked;
// Truncating stores.
def STB8 : DForm_3<38, (ops G8RC:$rS, memri:$src),
"stb $rS, $src", LdStGeneral,

106
lib/Target/PowerPC/PPCRegisterInfo.cpp
View File

@ -636,7 +636,7 @@ void PPCRegisterInfo::emitPrologue(MachineFunction &MF) const {
// Add the size of R1 to NumBytes size for the store of R1 to the bottom
// of the stack and round the size to a multiple of the alignment.
unsigned Align = std::max(TargetAlign, MaxAlign);
unsigned GPRSize = 4;
unsigned GPRSize = Subtarget.isPPC64() ? 8 : 4;
unsigned Size = HasFP ? GPRSize + GPRSize : GPRSize;
NumBytes = (NumBytes+Size+Align-1)/Align*Align;
@ -646,24 +646,47 @@ void PPCRegisterInfo::emitPrologue(MachineFunction &MF) const {
// Adjust stack pointer: r1 -= numbytes.
// If there is a preferred stack alignment, align R1 now
if (MaxAlign > TargetAlign) {
assert(isPowerOf2_32(MaxAlign) && MaxAlign < 32767 && "Invalid alignment!");
assert(isInt16(0-NumBytes) && "Unhandled stack size and alignment!");
BuildMI(MBB, MBBI, PPC::RLWINM, 4, PPC::R0)
.addReg(PPC::R1).addImm(0).addImm(32-Log2_32(MaxAlign)).addImm(31);
BuildMI(MBB, MBBI, PPC::SUBFIC,2,PPC::R0).addReg(PPC::R0)
.addImm(0-NumBytes);
BuildMI(MBB, MBBI, PPC::STWUX, 3)
.addReg(PPC::R1).addReg(PPC::R1).addReg(PPC::R0);
} else if (NumBytes <= 32768) {
BuildMI(MBB, MBBI, PPC::STWU, 3).addReg(PPC::R1).addImm(NegNumbytes)
.addReg(PPC::R1);
} else {
BuildMI(MBB, MBBI, PPC::LIS, 1, PPC::R0).addImm(NegNumbytes >> 16);
BuildMI(MBB, MBBI, PPC::ORI, 2, PPC::R0).addReg(PPC::R0)
.addImm(NegNumbytes & 0xFFFF);
BuildMI(MBB, MBBI, PPC::STWUX, 3).addReg(PPC::R1).addReg(PPC::R1)
.addReg(PPC::R0);
if (!Subtarget.isPPC64()) {
// PPC32.
if (MaxAlign > TargetAlign) {
assert(isPowerOf2_32(MaxAlign) && MaxAlign < 32767&&"Invalid alignment!");
assert(isInt16(0-NumBytes) && "Unhandled stack size and alignment!");
BuildMI(MBB, MBBI, PPC::RLWINM, 4, PPC::R0)
.addReg(PPC::R1).addImm(0).addImm(32-Log2_32(MaxAlign)).addImm(31);
BuildMI(MBB, MBBI, PPC::SUBFIC,2,PPC::R0).addReg(PPC::R0)
.addImm(0-NumBytes);
BuildMI(MBB, MBBI, PPC::STWUX, 3)
.addReg(PPC::R1).addReg(PPC::R1).addReg(PPC::R0);
} else if (NumBytes <= 32768) {
BuildMI(MBB, MBBI, PPC::STWU, 3).addReg(PPC::R1).addImm(NegNumbytes)
.addReg(PPC::R1);
} else {
BuildMI(MBB, MBBI, PPC::LIS, 1, PPC::R0).addImm(NegNumbytes >> 16);
BuildMI(MBB, MBBI, PPC::ORI, 2, PPC::R0).addReg(PPC::R0)
.addImm(NegNumbytes & 0xFFFF);
BuildMI(MBB, MBBI, PPC::STWUX, 3).addReg(PPC::R1).addReg(PPC::R1)
.addReg(PPC::R0);
}
} else { // PPC64.
if (MaxAlign > TargetAlign) {
assert(isPowerOf2_32(MaxAlign) && MaxAlign < 32767&&"Invalid alignment!");
assert(isInt16(0-NumBytes) && "Unhandled stack size and alignment!");
BuildMI(MBB, MBBI, PPC::RLDICL, 3, PPC::X0)
.addReg(PPC::X1).addImm(0).addImm(64-Log2_32(MaxAlign));
BuildMI(MBB, MBBI, PPC::SUBFIC8, 2, PPC::X0).addReg(PPC::X0)
.addImm(0-NumBytes);
BuildMI(MBB, MBBI, PPC::STDUX, 3)
.addReg(PPC::X1).addReg(PPC::X1).addReg(PPC::X0);
} else if (NumBytes <= 32768*4) {
BuildMI(MBB, MBBI, PPC::STDU, 3).addReg(PPC::X1).addImm(NegNumbytes/4)
.addReg(PPC::X1);
} else {
BuildMI(MBB, MBBI, PPC::LIS8, 1, PPC::X0).addImm(NegNumbytes >> 16);
BuildMI(MBB, MBBI, PPC::ORI8, 2, PPC::X0).addReg(PPC::X0)
.addImm(NegNumbytes & 0xFFFF);
BuildMI(MBB, MBBI, PPC::STDUX, 3).addReg(PPC::X1).addReg(PPC::X1)
.addReg(PPC::X0);
}
}
if (DebugInfo && DebugInfo->hasInfo()) {
@ -690,9 +713,15 @@ void PPCRegisterInfo::emitPrologue(MachineFunction &MF) const {
// If there is a frame pointer, copy R1 (SP) into R31 (FP)
if (HasFP) {
BuildMI(MBB, MBBI, PPC::STW, 3)
.addReg(PPC::R31).addImm(GPRSize).addReg(PPC::R1);
BuildMI(MBB, MBBI, PPC::OR, 2, PPC::R31).addReg(PPC::R1).addReg(PPC::R1);
if (!Subtarget.isPPC64()) {
BuildMI(MBB, MBBI, PPC::STW, 3)
.addReg(PPC::R31).addImm(GPRSize).addReg(PPC::R1);
BuildMI(MBB, MBBI, PPC::OR, 2, PPC::R31).addReg(PPC::R1).addReg(PPC::R1);
} else {
BuildMI(MBB, MBBI, PPC::STD, 3)
.addReg(PPC::X31).addImm(GPRSize/4).addReg(PPC::X1);
BuildMI(MBB, MBBI, PPC::OR8, 2, PPC::X31).addReg(PPC::X1).addReg(PPC::X1);
}
}
}
@ -714,17 +743,31 @@ void PPCRegisterInfo::emitEpilogue(MachineFunction &MF,
// If this function has a frame pointer, load the saved stack pointer from
// its stack slot.
if (hasFP(MF)) {
BuildMI(MBB, MBBI, PPC::LWZ, 2, PPC::R31)
.addImm(GPRSize).addReg(PPC::R31);
if (!Subtarget.isPPC64()) {
BuildMI(MBB, MBBI, PPC::LWZ, 2, PPC::R31)
.addImm(GPRSize).addReg(PPC::R31);
} else {
BuildMI(MBB, MBBI, PPC::LD, 2, PPC::X31)
.addImm(GPRSize/4).addReg(PPC::X31);
}
}
// The loaded (or persistent) stack pointer value is offseted by the 'stwu'
// The loaded (or persistent) stack pointer value is offset by the 'stwu'
// on entry to the function. Add this offset back now.
if (NumBytes < 32768 && TargetAlign >= MFI->getMaxAlignment()) {
BuildMI(MBB, MBBI, PPC::ADDI, 2, PPC::R1)
.addReg(PPC::R1).addImm(NumBytes);
if (!Subtarget.isPPC64()) {
if (NumBytes < 32768 && TargetAlign >= MFI->getMaxAlignment()) {
BuildMI(MBB, MBBI, PPC::ADDI, 2, PPC::R1)
.addReg(PPC::R1).addImm(NumBytes);
} else {
BuildMI(MBB, MBBI, PPC::LWZ, 2, PPC::R1).addImm(0).addReg(PPC::R1);
}
} else {
BuildMI(MBB, MBBI, PPC::LWZ, 2, PPC::R1).addImm(0).addReg(PPC::R1);
if (NumBytes < 32768 && TargetAlign >= MFI->getMaxAlignment()) {
BuildMI(MBB, MBBI, PPC::ADDI8, 2, PPC::X1)
.addReg(PPC::X1).addImm(NumBytes);
} else {
BuildMI(MBB, MBBI, PPC::LD, 2, PPC::X1).addImm(0).addReg(PPC::X1);
}
}
}
}
@ -734,7 +777,10 @@ unsigned PPCRegisterInfo::getRARegister() const {
}
unsigned PPCRegisterInfo::getFrameRegister(MachineFunction &MF) const {
return hasFP(MF) ? PPC::R31 : PPC::R1;
if (!Subtarget.isPPC64())
return hasFP(MF) ? PPC::R31 : PPC::R1;
else
return hasFP(MF) ? PPC::X31 : PPC::X1;
}
void PPCRegisterInfo::getInitialFrameState(std::vector<MachineMove *> &Moves)