+ int Mov = is64 ? X86::MOV64rr : X86::MOV32rr;
+ int Push = is64 ? X86::PUSH64r : X86::PUSH32r;
+ int PushF = is64 ? X86::PUSHF64 : X86::PUSHF32;
+ int Pop = is64 ? X86::POP64r : X86::POP32r;
+ int PopF = is64 ? X86::POPF64 : X86::POPF32;
+ int AX = is64 ? X86::RAX : X86::EAX;
+
+ if (!Subtarget.hasLAHFSAHF()) {
+ assert(is64 && "Not having LAHF/SAHF only happens on 64-bit.");
+ // Moving EFLAGS to / from another register requires a push and a pop.
+ // Notice that we have to adjust the stack if we don't want to clobber the
+ // first frame index. See X86FrameLowering.cpp - clobbersTheStack.
+ if (FromEFLAGS) {
+ BuildMI(MBB, MI, DL, get(PushF));
+ BuildMI(MBB, MI, DL, get(Pop), DestReg);
+ }
+ if (ToEFLAGS) {
+ BuildMI(MBB, MI, DL, get(Push))
+ .addReg(SrcReg, getKillRegState(KillSrc));
+ BuildMI(MBB, MI, DL, get(PopF));
+ }
+ return;
+ }
+