[llvm] r303901 - [AArch64]: add 'a' inline asm operand modifier.

[Manoj Gupta via llvm-commits]

Author: manojgupta
Date: Thu May 25 14:07:57 2017
New Revision: 303901

URL: http://llvm.org/viewvc/llvm-project?rev=303901&view=rev
Log:
[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


Modified:
    llvm/trunk/lib/Target/AArch64/AArch64AsmPrinter.cpp
    llvm/trunk/test/CodeGen/AArch64/arm64-inline-asm.ll

Modified: llvm/trunk/lib/Target/AArch64/AArch64AsmPrinter.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/AArch64/AArch64AsmPrinter.cpp?rev=303901&r1=303900&r2=303901&view=diff
==============================================================================
--- llvm/trunk/lib/Target/AArch64/AArch64AsmPrinter.cpp (original)
+++ llvm/trunk/lib/Target/AArch64/AArch64AsmPrinter.cpp Thu May 25 14:07:57 2017
@@ -320,6 +320,9 @@ bool AArch64AsmPrinter::PrintAsmOperand(
     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::PrintAsmMemoryOp
                                               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);

Modified: llvm/trunk/test/CodeGen/AArch64/arm64-inline-asm.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/AArch64/arm64-inline-asm.ll?rev=303901&r1=303900&r2=303901&view=diff
==============================================================================
--- llvm/trunk/test/CodeGen/AArch64/arm64-inline-asm.ll (original)
+++ llvm/trunk/test/CodeGen/AArch64/arm64-inline-asm.ll Thu May 25 14:07:57 2017
@@ -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
+}