diff options
Diffstat (limited to 'llvm/lib/Target/X86/X86MCInstLower.cpp')
| -rw-r--r-- | llvm/lib/Target/X86/X86MCInstLower.cpp | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/llvm/lib/Target/X86/X86MCInstLower.cpp b/llvm/lib/Target/X86/X86MCInstLower.cpp index 9ca5de6c30b..d38c7b49796 100644 --- a/llvm/lib/Target/X86/X86MCInstLower.cpp +++ b/llvm/lib/Target/X86/X86MCInstLower.cpp @@ -1720,6 +1720,41 @@ void X86AsmPrinter::EmitInstruction(const MachineInstr *MI) { return; } + case X86::MOVGOT64r: { + // Materializes the GOT for the 64-bit large code model. + MCSymbol *DotSym = OutContext.createTempSymbol(); + OutStreamer->EmitLabel(DotSym); + + unsigned DstReg = MI->getOperand(0).getReg(); + unsigned ScratchReg = MI->getOperand(1).getReg(); + MCSymbol *GOTSym = MCInstLowering.GetSymbolFromOperand(MI->getOperand(2)); + + // .LtmpN: leaq .LtmpN(%rip), %dst + const MCExpr *DotExpr = MCSymbolRefExpr::create(DotSym, OutContext); + EmitAndCountInstruction(MCInstBuilder(X86::LEA64r) + .addReg(DstReg) // dest + .addReg(X86::RIP) // base + .addImm(1) // scale + .addReg(0) // index + .addExpr(DotExpr) // disp + .addReg(0)); // seg + + // movq $_GLOBAL_OFFSET_TABLE_ - .LtmpN, %scratch + const MCExpr *GOTSymExpr = MCSymbolRefExpr::create(GOTSym, OutContext); + const MCExpr *GOTDiffExpr = + MCBinaryExpr::createSub(GOTSymExpr, DotExpr, OutContext); + EmitAndCountInstruction(MCInstBuilder(X86::MOV64ri) + .addReg(ScratchReg) // dest + .addExpr(GOTDiffExpr)); // disp + + // addq %scratch, %dst + EmitAndCountInstruction(MCInstBuilder(X86::ADD64rr) + .addReg(DstReg) // dest + .addReg(DstReg) // dest + .addReg(ScratchReg)); // src + return; + } + case X86::ADD32ri: { // Lower the MO_GOT_ABSOLUTE_ADDRESS form of ADD32ri. if (MI->getOperand(2).getTargetFlags() != X86II::MO_GOT_ABSOLUTE_ADDRESS) |
