[llvm-commits] [llvm] r114809 - in /llvm/trunk: lib/Target/X86/AsmParser/X86AsmParser.cpp test/MC/AsmParser/X86/x86_instructions.s

[Chris Lattner]

Author: lattner
Date: Sun Sep 26 23:23:03 2010
New Revision: 114809

URL: http://llvm.org/viewvc/llvm-project?rev=114809&view=rev
Log:
implement support for 'clr' alias.  This is part of rdar://8416805,
but balrog was wanting it on irc.

Modified:
    llvm/trunk/lib/Target/X86/AsmParser/X86AsmParser.cpp
    llvm/trunk/test/MC/AsmParser/X86/x86_instructions.s

Modified: llvm/trunk/lib/Target/X86/AsmParser/X86AsmParser.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/AsmParser/X86AsmParser.cpp?rev=114809&r1=114808&r2=114809&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/AsmParser/X86AsmParser.cpp (original)
+++ llvm/trunk/lib/Target/X86/AsmParser/X86AsmParser.cpp Sun Sep 26 23:23:03 2010
@@ -1052,6 +1052,17 @@
     Operands[0] = X86Operand::CreateToken("fstps", NameLoc);
   }
   
+  
+  // "clr <reg>" -> "xor <reg>, <reg>".
+  if ((Name == "clrb" || Name == "clrw" || Name == "clrl" || Name == "clrq" ||
+       Name == "clr") && Operands.size() == 2 &&
+      static_cast<X86Operand*>(Operands[1])->isReg()) {
+    unsigned RegNo = static_cast<X86Operand*>(Operands[1])->getReg();
+    Operands.push_back(X86Operand::CreateReg(RegNo, NameLoc, NameLoc));
+    delete Operands[0];
+    Operands[0] = X86Operand::CreateToken("xor", NameLoc);
+  }
+  
   return false;
 }
 

Modified: llvm/trunk/test/MC/AsmParser/X86/x86_instructions.s
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/MC/AsmParser/X86/x86_instructions.s?rev=114809&r1=114808&r2=114809&view=diff
==============================================================================
--- llvm/trunk/test/MC/AsmParser/X86/x86_instructions.s (original)
+++ llvm/trunk/test/MC/AsmParser/X86/x86_instructions.s Sun Sep 26 23:23:03 2010
@@ -360,4 +360,18 @@
 faddp %st, %st(1)
 fmulp %st, %st(2)
 
+// rdar://8416805
+// CHECK: xorb	%al, %al
+// CHECK: encoding: [0x30,0xc0]
+// CHECK: xorw	%di, %di
+// CHECK: encoding: [0x66,0x31,0xff]
+// CHECK: xorl	%esi, %esi
+// CHECK: encoding: [0x31,0xf6]
+// CHECK: xorq	%rsi, %rsi
+// CHECK: encoding: [0x48,0x31,0xf6]
+clrb    %al
+clr    %di
+clr    %esi
+clr    %rsi
+