Explicitly don't let the asm printer use the clrb/w/l aliases for xor %reg, %reg.

It only didn't use it before because it seems InstAlias handling in the asm printer fails to count tied operands so it tried to find an xor with 2 operands instead of the 3 it wfails to count tied.

llvm-svn: 186900

diff --git a/llvm/lib/Target/X86/X86InstrInfo.td b/llvm/lib/Target/X86/X86InstrInfo.td
index 9eca151..6bc1235 100644 (file)
--- a/llvm/lib/Target/X86/X86InstrInfo.td
+++ b/llvm/lib/Target/X86/X86InstrInfo.td
@@ -1985,10 +1985,10 @@ def : InstAlias<"bt {$imm, $mem|$mem, $imm}",
                 (BT32mi8 i32mem:$mem, i32i8imm:$imm), 0>;
 
 // clr aliases.
-def : InstAlias<"clrb $reg", (XOR8rr  GR8 :$reg, GR8 :$reg)>;
-def : InstAlias<"clrw $reg", (XOR16rr GR16:$reg, GR16:$reg)>;
-def : InstAlias<"clrl $reg", (XOR32rr GR32:$reg, GR32:$reg)>;
-def : InstAlias<"clrq $reg", (XOR64rr GR64:$reg, GR64:$reg)>;
+def : InstAlias<"clrb $reg", (XOR8rr  GR8 :$reg, GR8 :$reg), 0>;
+def : InstAlias<"clrw $reg", (XOR16rr GR16:$reg, GR16:$reg), 0>;
+def : InstAlias<"clrl $reg", (XOR32rr GR32:$reg, GR32:$reg), 0>;
+def : InstAlias<"clrq $reg", (XOR64rr GR64:$reg, GR64:$reg), 0>;
 
 // div and idiv aliases for explicit A register.
 def : InstAlias<"div{b}\t{$src, %al|AL, $src}", (DIV8r  GR8 :$src)>;