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Fundamentally change the MipsSubtarget replacement machinery:

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a) Move the replacement level decision to the target machine.
b) Create additional subtargets at the TargetMachine level to
   cache and make replacement easy.
c) Make the mips16 features obvious.
d) Remove the override logic as it no longer does anything.
e) Have MipsModuleDAGToDAGISel take only the target machine.
f) Have the constant islands pass grab the current subtarget
   from the MachineFunction (via the TargetMachine) instead
   of caching it.
g) Unconditionally initialize TLOF.
h) Remove the old complicated subtarget based resetting and
   replace it with simple conditionals.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213430 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Christopher
2014-07-18 23:41:32 +00:00
parent 0ce4f580bc
commit ec3b0fef11
11 changed files with 53 additions and 124 deletions
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82
lib/Target/Mips/MipsSubtarget.cpp
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@ -113,7 +113,7 @@ MipsSubtarget::MipsSubtarget(const std::string &TT, const std::string &CPU,
HasMips4_32r2(false), HasMips5_32r2(false), InMips16Mode(false),
InMips16HardFloat(Mips16HardFloat), InMicroMipsMode(false), HasDSP(false),
HasDSPR2(false), AllowMixed16_32(Mixed16_32 | Mips_Os16), Os16(Mips_Os16),
HasMSA(false), OverrideMode(NoOverride), TM(_TM), TargetTriple(TT),
HasMSA(false), TM(_TM), TargetTriple(TT),
DL(computeDataLayout(initializeSubtargetDependencies(CPU, FS, TM))),
TSInfo(DL), JITInfo(), InstrInfo(MipsInstrInfo::create(*this)),
FrameLowering(MipsFrameLowering::create(*this)),
@ -205,86 +205,6 @@ MipsSubtarget::initializeSubtargetDependencies(StringRef CPU, StringRef FS,
return *this;
}
//FIXME: This logic for reseting the subtarget along with
// the helper classes can probably be simplified but there are a lot of
// cases so we will defer rewriting this to later.
//
void MipsSubtarget::resetSubtarget(MachineFunction *MF) {
bool ChangeToMips16 = false, ChangeToNoMips16 = false;
DEBUG(dbgs() << "resetSubtargetFeatures" << "\n");
AttributeSet FnAttrs = MF->getFunction()->getAttributes();
ChangeToMips16 = FnAttrs.hasAttribute(AttributeSet::FunctionIndex,
"mips16");
ChangeToNoMips16 = FnAttrs.hasAttribute(AttributeSet::FunctionIndex,
"nomips16");
assert (!(ChangeToMips16 & ChangeToNoMips16) &&
"mips16 and nomips16 specified on the same function");
if (ChangeToMips16) {
if (PreviousInMips16Mode)
return;
OverrideMode = Mips16Override;
PreviousInMips16Mode = true;
setHelperClassesMips16();
return;
} else if (ChangeToNoMips16) {
if (!PreviousInMips16Mode)
return;
OverrideMode = NoMips16Override;
PreviousInMips16Mode = false;
setHelperClassesMipsSE();
return;
} else {
if (OverrideMode == NoOverride)
return;
OverrideMode = NoOverride;
DEBUG(dbgs() << "back to default" << "\n");
if (inMips16Mode() && !PreviousInMips16Mode) {
setHelperClassesMips16();
PreviousInMips16Mode = true;
} else if (!inMips16Mode() && PreviousInMips16Mode) {
setHelperClassesMipsSE();
PreviousInMips16Mode = false;
}
return;
}
}
void MipsSubtarget::setHelperClassesMips16() {
InstrInfoSE.swap(InstrInfo);
FrameLoweringSE.swap(FrameLowering);
TLInfoSE.swap(TLInfo);
if (!InstrInfo16) {
InstrInfo.reset(MipsInstrInfo::create(*this));
FrameLowering.reset(MipsFrameLowering::create(*this));
TLInfo.reset(MipsTargetLowering::create(*TM, *this));
} else {
InstrInfo16.swap(InstrInfo);
FrameLowering16.swap(FrameLowering);
TLInfo16.swap(TLInfo);
}
assert(TLInfo && "null target lowering 16");
assert(InstrInfo && "null instr info 16");
assert(FrameLowering && "null frame lowering 16");
}
void MipsSubtarget::setHelperClassesMipsSE() {
InstrInfo16.swap(InstrInfo);
FrameLowering16.swap(FrameLowering);
TLInfo16.swap(TLInfo);
if (!InstrInfoSE) {
InstrInfo.reset(MipsInstrInfo::create(*this));
FrameLowering.reset(MipsFrameLowering::create(*this));
TLInfo.reset(MipsTargetLowering::create(*TM, *this));
} else {
InstrInfoSE.swap(InstrInfo);
FrameLoweringSE.swap(FrameLowering);
TLInfoSE.swap(TLInfo);
}
assert(TLInfo && "null target lowering in SE");
assert(InstrInfo && "null instr info SE");
assert(FrameLowering && "null frame lowering SE");
}
bool MipsSubtarget::abiUsesSoftFloat() const {
return TM->Options.UseSoftFloat && !InMips16HardFloat;
}