[PATCH] D15150: Add support for "xlat m8"

[Marina Yatsina via llvm-commits]

myatsina created this revision.
myatsina added a reviewer: rnk.
myatsina added a subscriber: llvm-commits.
myatsina set the repository for this revision to rL LLVM.

According to x86 spec "xlat m8" is a legal instruction and it is equivalent to "xlatb".

Repository:
  rL LLVM

http://reviews.llvm.org/D15150

Files:
  lib/Target/X86/AsmParser/X86AsmParser.cpp
  test/MC/X86/intel-syntax.s

Index: lib/Target/X86/AsmParser/X86AsmParser.cpp
===================================================================
--- lib/Target/X86/AsmParser/X86AsmParser.cpp
+++ lib/Target/X86/AsmParser/X86AsmParser.cpp
@@ -2372,6 +2372,15 @@
         }
   }
 
+  // Transforms "xlat mem8" into "xlatb"
+  if ((Name == "xlat" || Name == "xlatb") && Operands.size() == 2) {
+    X86Operand &Op1 = static_cast<X86Operand &>(*Operands[1]);
+    if (Op1.isMem8()) {
+      Operands.pop_back();
+      static_cast<X86Operand &>(*Operands[0]).setTokenValue("xlatb");
+    }
+  }
+
   return false;
 }
 
Index: test/MC/X86/intel-syntax.s
===================================================================
--- test/MC/X86/intel-syntax.s
+++ test/MC/X86/intel-syntax.s
@@ -736,3 +736,6 @@
 fbstp tbyte ptr [eax]
 // CHECK: fbld (%eax)
 // CHECK: fbstp (%eax)
+
+xlat byte ptr [eax]
+// CHECK: xlatb


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