diff options
Diffstat (limited to 'lib/Target/X86/X86InstrInfo.h')
| -rw-r--r-- | lib/Target/X86/X86InstrInfo.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/lib/Target/X86/X86InstrInfo.h b/lib/Target/X86/X86InstrInfo.h index b83441d89effd..0ab85f4f45b2f 100644 --- a/lib/Target/X86/X86InstrInfo.h +++ b/lib/Target/X86/X86InstrInfo.h @@ -448,6 +448,16 @@ public: unsigned &SrcReg, unsigned &DstReg, unsigned &SrcSubIdx, unsigned &DstSubIdx) const; + /// isCoalescableExtInstr - Return true if the instruction is a "coalescable" + /// extension instruction. That is, it's like a copy where it's legal for the + /// source to overlap the destination. e.g. X86::MOVSX64rr32. If this returns + /// true, then it's expected the pre-extension value is available as a subreg + /// of the result register. This also returns the sub-register index in + /// SubIdx. + virtual bool isCoalescableExtInstr(const MachineInstr &MI, + unsigned &SrcReg, unsigned &DstReg, + unsigned &SubIdx) const; + unsigned isLoadFromStackSlot(const MachineInstr *MI, int &FrameIndex) const; /// isLoadFromStackSlotPostFE - Check for post-frame ptr elimination /// stack locations as well. This uses a heuristic so it isn't |