8339698: x86 unused andw/orw/xorw/addw encoding could be removed

Reviewed-by: kvn, jbhateja, qamai

Author: Sandhya Viswanathan

src/hotspot/cpu/x86/assembler_x86.cpp

@@ -1405,12 +1405,6 @@ void Assembler::addb(Register dst, int imm8) {
   emit_arith_b(0x80, 0xC0, dst, imm8);
 }
 
-void Assembler::addw(Register dst, Register src) {
-  emit_int8(0x66);
-  (void)prefix_and_encode(dst->encoding(), src->encoding());
-  emit_arith(0x03, 0xC0, dst, src);
-}
-
 void Assembler::addw(Address dst, int imm16) {
   InstructionMark im(this);
   emit_int8(0x66);
@@ -1632,11 +1626,6 @@ void Assembler::andb(Address dst, Register src) {
   emit_operand(src, dst, 0);
 }
 
-void Assembler::andw(Register dst, Register src) {
-  (void)prefix_and_encode(dst->encoding(), src->encoding());
-  emit_arith(0x23, 0xC0, dst, src);
-}
-
 void Assembler::andl(Address dst, int32_t imm32) {
   InstructionMark im(this);
   prefix(dst);
@@ -4230,11 +4219,6 @@ void Assembler::notl(Register dst) {
   emit_int16((unsigned char)0xF7, (0xD0 | encode));
 }
 
-void Assembler::orw(Register dst, Register src) {
-  (void)prefix_and_encode(dst->encoding(), src->encoding());
-  emit_arith(0x0B, 0xC0, dst, src);
-}
-
 void Assembler::orl(Address dst, int32_t imm32) {
   InstructionMark im(this);
   prefix(dst);
@@ -6803,11 +6787,6 @@ void Assembler::xorb(Address dst, Register src) {
   emit_operand(src, dst, 0);
 }
 
-void Assembler::xorw(Register dst, Register src) {
-  (void)prefix_and_encode(dst->encoding(), src->encoding());
-  emit_arith(0x33, 0xC0, dst, src);
-}
-
 void Assembler::xorw(Register dst, Address src) {
   InstructionMark im(this);
   emit_int8(0x66);

src/hotspot/cpu/x86/assembler_x86.hpp

@@ -1068,7 +1068,6 @@ class Assembler : public AbstractAssembler  {
   void addb(Address dst, int imm8);
   void addb(Address dst, Register src);
   void addb(Register dst, int imm8);
-  void addw(Register dst, Register src);
   void addw(Address dst, int imm16);
   void addw(Address dst, Register src);
 
@@ -1120,7 +1119,6 @@ class Assembler : public AbstractAssembler  {
   void vaesdec(XMMRegister dst, XMMRegister nds, XMMRegister src, int vector_len);
   void vaesdeclast(XMMRegister dst, XMMRegister nds, XMMRegister src, int vector_len);
 
-  void andw(Register dst, Register src);
   void andb(Address dst, Register src);
 
   void andl(Address  dst, int32_t imm32);
@@ -1824,8 +1822,6 @@ class Assembler : public AbstractAssembler  {
 #endif
   void btq(Register dst, Register src);
 
-  void orw(Register dst, Register src);
-
   void orl(Address dst, int32_t imm32);
   void orl(Register dst, int32_t imm32);
   void orl(Register dst, Address src);
@@ -2342,7 +2338,6 @@ class Assembler : public AbstractAssembler  {
 
   void xorb(Address dst, Register src);
   void xorb(Register dst, Address src);
-  void xorw(Register dst, Register src);
   void xorw(Register dst, Address src);
 
   void xorq(Register dst, Address src);