diff options
Diffstat (limited to 'lib/Target/Mips/Mips16RegisterInfo.cpp')
-rw-r--r-- | lib/Target/Mips/Mips16RegisterInfo.cpp | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/lib/Target/Mips/Mips16RegisterInfo.cpp b/lib/Target/Mips/Mips16RegisterInfo.cpp index e0c4971..c15d1bf 100644 --- a/lib/Target/Mips/Mips16RegisterInfo.cpp +++ b/lib/Target/Mips/Mips16RegisterInfo.cpp @@ -55,4 +55,57 @@ void Mips16RegisterInfo::eliminateFI(MachineBasicBlock::iterator II, unsigned OpNo, int FrameIndex, uint64_t StackSize, int64_t SPOffset) const { + MachineInstr &MI = *II; + MachineFunction &MF = *MI.getParent()->getParent(); + MachineFrameInfo *MFI = MF.getFrameInfo(); + MipsFunctionInfo *MipsFI = MF.getInfo<MipsFunctionInfo>(); + + const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo(); + int MinCSFI = 0; + int MaxCSFI = -1; + + if (CSI.size()) { + MinCSFI = CSI[0].getFrameIdx(); + MaxCSFI = CSI[CSI.size() - 1].getFrameIdx(); + } + + // The following stack frame objects are always + // referenced relative to $sp: + // 1. Outgoing arguments. + // 2. Pointer to dynamically allocated stack space. + // 3. Locations for callee-saved registers. + // Everything else is referenced relative to whatever register + // getFrameRegister() returns. + unsigned FrameReg; + + if (MipsFI->isOutArgFI(FrameIndex) || + (FrameIndex >= MinCSFI && FrameIndex <= MaxCSFI)) + FrameReg = Subtarget.isABI_N64() ? Mips::SP_64 : Mips::SP; + else + FrameReg = getFrameRegister(MF); + + // Calculate final offset. + // - There is no need to change the offset if the frame object + // is one of the + // following: an outgoing argument, pointer to a dynamically allocated + // stack space or a $gp restore location, + // - If the frame object is any of the following, + // its offset must be adjusted + // by adding the size of the stack: + // incoming argument, callee-saved register location or local variable. + int64_t Offset; + + if (MipsFI->isOutArgFI(FrameIndex)) + Offset = SPOffset; + else + Offset = SPOffset + (int64_t)StackSize; + + Offset += MI.getOperand(OpNo + 1).getImm(); + + DEBUG(errs() << "Offset : " << Offset << "\n" << "<--------->\n"); + + MI.getOperand(OpNo).ChangeToRegister(FrameReg, false); + MI.getOperand(OpNo + 1).ChangeToImmediate(Offset); + + } |