src/hotspot/cpu/x86/x86_64.ad

rev 50189 : 8203628: Optimize (masked) byte memory comparisons on x86
Reviewed-by: XXX

*** 2978,2987 ****
--- 2978,2997 ----
    op_cost(5);
    format %{ %}
    interface(CONST_INTER);
  %}
  
+ operand immU8()
+ %{
+   predicate((0 <= n->get_int()) && (n->get_int() <= 255));
+   match(ConI);
+ 
+   op_cost(5);
+   format %{ %}
+   interface(CONST_INTER);
+ %}
+ 
  operand immI16()
  %{
    predicate((-32768 <= n->get_int()) && (n->get_int() <= 32767));
    match(ConI);
  
*** 11595,11604 ****
--- 11605,11654 ----
    opcode(0x85);
    ins_encode(REX_reg_reg_wide(src, src), OpcP, reg_reg(src, src));
    ins_pipe(ialu_cr_reg_imm);
  %}
  
+ instruct compUB_mem_imm(rFlagsReg cr, memory mem, immU8 imm)
+ %{
+   match(Set cr (CmpI (LoadUB mem) imm));
+ 
+   ins_cost(125);
+   format %{ "cmpb    $mem, $imm" %}
+   ins_encode %{ __ cmpb($mem$$Address, $imm$$constant); %}
+   ins_pipe(ialu_cr_reg_mem);
+ %}
+ 
+ instruct compB_mem_imm(rFlagsReg cr, memory mem, immI8 imm)
+ %{
+   match(Set cr (CmpI (LoadB mem) imm));
+ 
+   ins_cost(125);
+   format %{ "cmpb    $mem, $imm" %}
+   ins_encode %{ __ cmpb($mem$$Address, $imm$$constant); %}
+   ins_pipe(ialu_cr_reg_mem);
+ %}
+ 
+ instruct testUB_mem_imm(rFlagsReg cr, memory mem, immU8 imm, immI0 zero)
+ %{
+   match(Set cr (CmpI (AndI (LoadUB mem) imm) zero));
+ 
+   ins_cost(125);
+   format %{ "testb   $mem, $imm" %}
+   ins_encode %{ __ testb($mem$$Address, $imm$$constant); %}
+   ins_pipe(ialu_cr_reg_mem);
+ %}
+ 
+ instruct testB_mem_imm(rFlagsReg cr, memory mem, immI8 imm, immI0 zero)
+ %{
+   match(Set cr (CmpI (AndI (LoadB mem) imm) zero));
+ 
+   ins_cost(125);
+   format %{ "testb   $mem, $imm" %}
+   ins_encode %{ __ testb($mem$$Address, $imm$$constant); %}
+   ins_pipe(ialu_cr_reg_mem);
+ %}
+ 
  //----------Max and Min--------------------------------------------------------
  // Min Instructions
  
  instruct cmovI_reg_g(rRegI dst, rRegI src, rFlagsReg cr)
  %{