diff options
Diffstat (limited to 'llvm/lib/Target/X86/X86InstrInfo.h')
| -rw-r--r-- | llvm/lib/Target/X86/X86InstrInfo.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/llvm/lib/Target/X86/X86InstrInfo.h b/llvm/lib/Target/X86/X86InstrInfo.h index 72eee6bc3ee..c8f8716fcda 100644 --- a/llvm/lib/Target/X86/X86InstrInfo.h +++ b/llvm/lib/Target/X86/X86InstrInfo.h @@ -179,6 +179,18 @@ public: unsigned& sourceReg, unsigned& destReg) const; + /// convertToThreeAddress - This method must be implemented by targets that + /// set the M_CONVERTIBLE_TO_3_ADDR flag. When this flag is set, the target + /// may be able to convert a two-address instruction into a true + /// three-address instruction on demand. This allows the X86 target (for + /// example) to convert ADD and SHL instructions into LEA instructions if they + /// would require register copies due to two-addressness. + /// + /// This method returns a null pointer if the transformation cannot be + /// performed, otherwise it returns the new instruction. + /// + virtual MachineInstr *convertToThreeAddress(MachineInstr *TA) const; + /// Insert a goto (unconditional branch) sequence to TMBB, at the /// end of MBB virtual void insertGoto(MachineBasicBlock& MBB, |
