[X86] Add support for "xlat m8"
According to x86 spec "xlat m8" is a legal instruction and it is equivalent to "xlatb".
Differential Revision: http://reviews.llvm.org/D15150
llvm-svn: 258135
diff --git a/llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp b/llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp
index 419858e..08b2ea3 100644
--- a/llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp
+++ b/llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp
@@ -2475,6 +2475,17 @@
}
}
+ // Transforms "xlat mem8" into "xlatb"
+ if ((Name == "xlat" || Name == "xlatb") && Operands.size() == 2) {
+ X86Operand &Op1 = static_cast<X86Operand &>(*Operands[1]);
+ if (Op1.isMem8()) {
+ Warning(Op1.getStartLoc(), "memory operand is only for determining the "
+ "size, (R|E)BX will be used for the location");
+ Operands.pop_back();
+ static_cast<X86Operand &>(*Operands[0]).setTokenValue("xlatb");
+ }
+ }
+
return false;
}
diff --git a/llvm/test/MC/X86/intel-syntax.s b/llvm/test/MC/X86/intel-syntax.s
index d46aa97..11dc8cf 100644
--- a/llvm/test/MC/X86/intel-syntax.s
+++ b/llvm/test/MC/X86/intel-syntax.s
@@ -775,3 +775,7 @@
// CHECK: movsl (%esi), %es:(%edi)
// CHECK-STDERR: memory operand is only for determining the size, ES:(R|E)DI will be used for the location
// CHECK-STDERR: memory operand is only for determining the size, ES:(R|E)SI will be used for the location
+
+xlat byte ptr [eax]
+// CHECK: xlatb
+// CHECK-STDERR: memory operand is only for determining the size, (R|E)BX will be used for the location