ARM assembler support for register name aliases.

rdar://10550084

llvm-svn: 146170

Author: Jim Grosbach

llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp

@@ -2148,8 +2148,6 @@ int ARMAsmParser::tryParseRegister() {
   const AsmToken &Tok = Parser.getTok();
   if (Tok.isNot(AsmToken::Identifier)) return -1;
 
-  // FIXME: Validate register for the current architecture; we have to do
-  // validation later, so maybe there is no need for this here.
   std::string lowerCase = Tok.getString().lower();
   unsigned RegNum = MatchRegisterName(lowerCase);
   if (!RegNum) {
@@ -2158,6 +2156,22 @@ int ARMAsmParser::tryParseRegister() {
       .Case("r14", ARM::LR)
       .Case("r15", ARM::PC)
       .Case("ip", ARM::R12)
+      // Additional register name aliases for 'gas' compatibility.
+      .Case("a1", ARM::R0)
+      .Case("a2", ARM::R1)
+      .Case("a3", ARM::R2)
+      .Case("a4", ARM::R3)
+      .Case("v1", ARM::R4)
+      .Case("v2", ARM::R5)
+      .Case("v3", ARM::R6)
+      .Case("v4", ARM::R7)
+      .Case("v5", ARM::R8)
+      .Case("v6", ARM::R9)
+      .Case("v7", ARM::R10)
+      .Case("v8", ARM::R11)
+      .Case("sb", ARM::R9)
+      .Case("sl", ARM::R10)
+      .Case("fp", ARM::R11)
       .Default(0);
   }
   if (!RegNum) return -1;