diff options
Diffstat (limited to 'lib/Target/ARM/Thumb1InstrInfo.cpp')
| -rw-r--r-- | lib/Target/ARM/Thumb1InstrInfo.cpp | 34 |
1 files changed, 32 insertions, 2 deletions
diff --git a/lib/Target/ARM/Thumb1InstrInfo.cpp b/lib/Target/ARM/Thumb1InstrInfo.cpp index 68cbb5c..8ea912e 100644 --- a/lib/Target/ARM/Thumb1InstrInfo.cpp +++ b/lib/Target/ARM/Thumb1InstrInfo.cpp @@ -11,6 +11,7 @@ // //===----------------------------------------------------------------------===// +#include "ARMSubtarget.h" #include "Thumb1InstrInfo.h" #include "llvm/CodeGen/MachineFrameInfo.h" #include "llvm/CodeGen/MachineInstrBuilder.h" @@ -41,10 +42,30 @@ void Thumb1InstrInfo::copyPhysReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator I, DebugLoc DL, unsigned DestReg, unsigned SrcReg, bool KillSrc) const { - AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::tMOVr), DestReg) - .addReg(SrcReg, getKillRegState(KillSrc))); + // Need to check the arch. + MachineFunction &MF = *MBB.getParent(); + const ARMSubtarget &st = MF.getTarget().getSubtarget<ARMSubtarget>(); + assert(ARM::GPRRegClass.contains(DestReg, SrcReg) && "Thumb1 can only copy GPR registers"); + + if (st.hasV6Ops() || ARM::hGPRRegClass.contains(SrcReg) + || !ARM::tGPRRegClass.contains(DestReg)) + AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::tMOVr), DestReg) + .addReg(SrcReg, getKillRegState(KillSrc))); + else { + // FIXME: The performance consequences of this are going to be atrocious. + // Some things to try that should be better: + // * 'mov hi, $src; mov $dst, hi', with hi as either r10 or r11 + // * 'movs $dst, $src' if cpsr isn't live + // See: http://lists.cs.uiuc.edu/pipermail/llvmdev/2014-August/075998.html + + // 'MOV lo, lo' is unpredictable on < v6, so use the stack to do it + AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::tPUSH))) + .addReg(SrcReg, getKillRegState(KillSrc)); + AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::tPOP))) + .addReg(DestReg, getDefRegState(true)); + } } void Thumb1InstrInfo:: @@ -101,3 +122,12 @@ loadRegFromStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I, .addFrameIndex(FI).addImm(0).addMemOperand(MMO)); } } + +void +Thumb1InstrInfo::expandLoadStackGuard(MachineBasicBlock::iterator MI, + Reloc::Model RM) const { + if (RM == Reloc::PIC_) + expandLoadStackGuardBase(MI, ARM::tLDRLIT_ga_pcrel, ARM::tLDRi, RM); + else + expandLoadStackGuardBase(MI, ARM::tLDRLIT_ga_abs, ARM::tLDRi, RM); +} |