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[X86] Support 'V' register operand modifier

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This allows the register name to be printed without the leading '%'.
This can be used for emitting calls to the retpoline thunks from inline
asm.

llvm-svn: 324645
This commit is contained in:
David Woodhouse 2018-02-08 20:06:05 +00:00
parent 8dc15de372
commit 295aeb9f05
2 changed files with 24 additions and 1 deletions
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11
lib/Target/X86/X86AsmPrinter.cpp
View File

@ -370,6 +370,8 @@ static void printIntelMemReference(X86AsmPrinter &P, const MachineInstr *MI,
static bool printAsmMRegister(X86AsmPrinter &P, const MachineOperand &MO,
char Mode, raw_ostream &O) {
unsigned Reg = MO.getReg();
bool EmitPercent = true;
switch (Mode) {
default: return true; // Unknown mode.
case 'b': // Print QImode register
@ -384,6 +386,9 @@ static bool printAsmMRegister(X86AsmPrinter &P, const MachineOperand &MO,
case 'k': // Print SImode register
Reg = getX86SubSuperRegister(Reg, 32);
break;
case 'V':
EmitPercent = false;
LLVM_FALLTHROUGH;
case 'q':
// Print 64-bit register names if 64-bit integer registers are available.
// Otherwise, print 32-bit register names.
@ -391,7 +396,10 @@ static bool printAsmMRegister(X86AsmPrinter &P, const MachineOperand &MO,
break;
}
O << '%' << X86ATTInstPrinter::getRegisterName(Reg);
if (EmitPercent)
O << '%';
O << X86ATTInstPrinter::getRegisterName(Reg);
return false;
}
@ -464,6 +472,7 @@ bool X86AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
case 'w': // Print HImode register
case 'k': // Print SImode register
case 'q': // Print DImode register
case 'V': // Print native register without '%'
if (MO.isReg())
return printAsmMRegister(*this, MO, ExtraCode[0], O);
printOperand(*this, MI, OpNo, O);

14
test/CodeGen/X86/inline-asm-modifier-V.ll Normal file
View File

@ -0,0 +1,14 @@
; RUN: llc < %s -mtriple=i686-- -no-integrated-as | FileCheck -check-prefix=X86 %s
; RUN: llc < %s -mtriple=x86_64-- -no-integrated-as | FileCheck -check-prefix=X64 %s
; If the target does not have 64-bit integer registers, emit 32-bit register
; names.
; X86: call __x86_indirect_thunk_e{{[abcd]}}x
; X64: call __x86_indirect_thunk_r
define void @q_modifier(i32* %p) {
entry:
tail call void asm sideeffect "call __x86_indirect_thunk_${0:V}", "r,~{dirflag},~{fpsr},~{flags}"(i32* %p)
ret void
}