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| -rw-r--r-- | lib/Target/X86/X86InstrBuilder.h | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/lib/Target/X86/X86InstrBuilder.h b/lib/Target/X86/X86InstrBuilder.h new file mode 100644 index 0000000000..1d9d6b9e1a --- /dev/null +++ b/lib/Target/X86/X86InstrBuilder.h @@ -0,0 +1,28 @@ +//===-- X86InstrBuilder.h - Functions to aid building x86 insts -*- C++ -*-===// +// +// This file exposes functions that may be used with BuildMI from the +// MachineInstrBuilder.h file to handle X86'isms in a clean way. +// +// The BuildMem function may be used with the BuildMI function to add entire +// memory references in a single, typed, function call. X86 memory references +// can be very complex expressions (described in the README), so wrapping them +// up behind an easier to use interface makes sense. Descriptions of the +// functions are included below. +// +//===----------------------------------------------------------------------===// + +#ifndef X86INSTRBUILDER_H +#define X86INSTRBUILDER_H + +#include "llvm/CodeGen/MachineInstrBuilder.h" + +/// addDirectMem - This function is used to add a direct memory reference to the +/// current instruction. Because memory references are always represented with +/// four values, this adds: Reg, [1, NoReg, 0] to the instruction +/// +inline const MachineInstrBuilder &addDirectMem(const MachineInstrBuilder &MIB, + unsigned Reg) { + return MIB.addReg(Reg).addZImm(1).addMReg(0).addSImm(0); +} + +#endif |