Allow a slash, '/', as a prefix separator for X86. rdar://8741045

llvm-svn: 121320

llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp

@@ -758,6 +758,8 @@ ParseInstruction(StringRef Name, SMLoc NameLoc,
 
   if (getLexer().is(AsmToken::EndOfStatement))
     Parser.Lex(); // Consume the EndOfStatement
+  else if (isPrefix && getLexer().is(AsmToken::Slash))
+    Parser.Lex(); // Consume the prefix separator Slash
 
   // This is a terrible hack to handle "out[bwl]? %al, (%dx)" ->
   // "outb %al, %dx".  Out doesn't take a memory form, but this is a widely

llvm/test/MC/X86/x86-64.s

@@ -738,6 +738,11 @@ lock  incl 1(%rsp)
 // CHECK: lock
 // CHECK: incl 1(%rsp)
 
+// rdar://8741045
+lock/incl 1(%rsp)
+// CHECK: lock
+// CHECK: incl 1(%rsp)
+
 // rdar://8033482
 rep movsl
 // CHECK: rep