diff options
Diffstat (limited to 'lib/Target/RISCV/RISCVRegisterInfo.cpp')
-rw-r--r-- | lib/Target/RISCV/RISCVRegisterInfo.cpp | 41 |
1 files changed, 38 insertions, 3 deletions
diff --git a/lib/Target/RISCV/RISCVRegisterInfo.cpp b/lib/Target/RISCV/RISCVRegisterInfo.cpp index 4f6c528061cb..cd658d7e2d97 100644 --- a/lib/Target/RISCV/RISCVRegisterInfo.cpp +++ b/lib/Target/RISCV/RISCVRegisterInfo.cpp @@ -18,9 +18,9 @@ #include "llvm/CodeGen/MachineFunction.h" #include "llvm/CodeGen/MachineInstrBuilder.h" #include "llvm/CodeGen/RegisterScavenging.h" +#include "llvm/CodeGen/TargetFrameLowering.h" +#include "llvm/CodeGen/TargetInstrInfo.h" #include "llvm/Support/ErrorHandling.h" -#include "llvm/Target/TargetFrameLowering.h" -#include "llvm/Target/TargetInstrInfo.h" #define GET_REGINFO_TARGET_DESC #include "RISCVGenRegisterInfo.inc" @@ -50,12 +50,47 @@ BitVector RISCVRegisterInfo::getReservedRegs(const MachineFunction &MF) const { return Reserved; } +const uint32_t *RISCVRegisterInfo::getNoPreservedMask() const { + return CSR_NoRegs_RegMask; +} + void RISCVRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II, int SPAdj, unsigned FIOperandNum, RegScavenger *RS) const { - report_fatal_error("Subroutines not supported yet"); + // TODO: this implementation is a temporary placeholder which does just + // enough to allow other aspects of code generation to be tested + + assert(SPAdj == 0 && "Unexpected non-zero SPAdj value"); + + MachineInstr &MI = *II; + MachineFunction &MF = *MI.getParent()->getParent(); + const TargetFrameLowering *TFI = MF.getSubtarget().getFrameLowering(); + DebugLoc DL = MI.getDebugLoc(); + + unsigned FrameReg = getFrameRegister(MF); + int FrameIndex = MI.getOperand(FIOperandNum).getIndex(); + int Offset = TFI->getFrameIndexReference(MF, FrameIndex, FrameReg); + Offset += MI.getOperand(FIOperandNum + 1).getImm(); + + assert(TFI->hasFP(MF) && "eliminateFrameIndex currently requires hasFP"); + + // Offsets must be directly encoded in a 12-bit immediate field + if (!isInt<12>(Offset)) { + report_fatal_error( + "Frame offsets outside of the signed 12-bit range not supported"); + } + + MI.getOperand(FIOperandNum).ChangeToRegister(FrameReg, false); + MI.getOperand(FIOperandNum + 1).ChangeToImmediate(Offset); + return; } unsigned RISCVRegisterInfo::getFrameRegister(const MachineFunction &MF) const { return RISCV::X8; } + +const uint32_t * +RISCVRegisterInfo::getCallPreservedMask(const MachineFunction & /*MF*/, + CallingConv::ID /*CC*/) const { + return CSR_RegMask; +} |