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[AArch64]: add 'a' inline asm operand modifier. 

Summary:
This is used in the Linux kernel, and effectively just means "print an
address". This brings back r193593.

Reviewed by: Renato Golin

Reviewers: t.p.northover, rengolin, richard.barton.arm, kristof.beyls

Subscribers: aemerson, javed.absar, llvm-commits, eraman

Differential Revision: https://reviews.llvm.org/D33558

llvm-svn: 303901
This commit is contained in:
Manoj Gupta 2017-05-25 19:07:57 +00:00
parent 51056aef65
commit d536180fdc
2 changed files with 11 additions and 1 deletions
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5
llvm/lib/Target/AArch64/AArch64AsmPrinter.cpp
View File

@ -320,6 +320,9 @@ bool AArch64AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNum,
switch (ExtraCode[0]) {
default:
return true; // Unknown modifier.
case 'a': // Print 'a' modifier
PrintAsmMemoryOperand(MI, OpNum, AsmVariant, ExtraCode, O);
return false;
case 'w': // Print W register
case 'x': // Print X register
if (MO.isReg())
@ -388,7 +391,7 @@ bool AArch64AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
unsigned AsmVariant,
const char *ExtraCode,
raw_ostream &O) {
if (ExtraCode && ExtraCode[0])
if (ExtraCode && ExtraCode[0] && ExtraCode[0] != 'a')
return true; // Unknown modifier.
const MachineOperand &MO = MI->getOperand(OpNum);

7
llvm/test/CodeGen/AArch64/arm64-inline-asm.ll
View File

@ -254,3 +254,10 @@ define void @test_constraint_w(i32 %a) {
tail call void asm sideeffect "sqxtn h0, ${0:s}\0A", "w"(i32 %a)
ret void
}
define void @test_inline_modifier_a(i8* %ptr) nounwind {
; CHECK-LABEL: test_inline_modifier_a:
tail call void asm sideeffect "prfm pldl1keep, ${0:a}\0A", "r"(i8* %ptr)
; CHECK: prfm pldl1keep, [x0]
ret void
}