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Minor optimisation to x86 recompiler versions of JL/JNL/JLE/JNLE/JBE/JNBE.

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This commit is contained in:
TomW 2015-08-19 21:31:13 +01:00
commit a2bef57491
1 changed files with 197 additions and 74 deletions
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123
src/codegen_ops_x86.h
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@ -1487,6 +1487,45 @@ static void TEST_NONZERO_JUMP_L(int host_reg, uint32_t new_pc, int taken_cycles)
static int BRANCH_COND_BE(int pc_offset, uint32_t op_pc, uint32_t offset, int not) static int BRANCH_COND_BE(int pc_offset, uint32_t op_pc, uint32_t offset, int not)
{ {
switch (codegen_flags_changed ? flags_op : FLAGS_UNKNOWN)
{
case FLAGS_SUB8:
addbyte(0xa0); /*MOV AL, flags_op1*/
addlong((uint32_t)&flags_op1);
addbyte(0x3a); /*CMP AL, flags_op2*/
addbyte(0x05);
addlong((uint32_t)&flags_op2);
if (not)
addbyte(0x76); /*JBE*/
else
addbyte(0x77); /*JNBE*/
break;
case FLAGS_SUB16:
addbyte(0x66); /*MOV AX, flags_op1*/
addbyte(0xa1);
addlong((uint32_t)&flags_op1);
addbyte(0x66); /*CMP AX, flags_op2*/
addbyte(0x3b);
addbyte(0x05);
addlong((uint32_t)&flags_op2);
if (not)
addbyte(0x76); /*JBE*/
else
addbyte(0x77); /*JNBE*/
break;
case FLAGS_SUB32:
addbyte(0xa1); /*MOV EAX, flags_op1*/
addlong((uint32_t)&flags_op1);
addbyte(0x3b); /*CMP EAX, flags_op2*/
addbyte(0x05);
addlong((uint32_t)&flags_op2);
if (not)
addbyte(0x76); /*JBE*/
else
addbyte(0x77); /*JNBE*/
break;
default:
if (codegen_flags_changed && flags_op != FLAGS_UNKNOWN) if (codegen_flags_changed && flags_op != FLAGS_UNKNOWN)
{ {
addbyte(0x83); /*CMP flags_res, 0*/ addbyte(0x83); /*CMP flags_res, 0*/
@ -1513,6 +1552,8 @@ static int BRANCH_COND_BE(int pc_offset, uint32_t op_pc, uint32_t offset, int no
addbyte(0x75); /*JNZ +*/ addbyte(0x75); /*JNZ +*/
else else
addbyte(0x74); /*JZ +*/ addbyte(0x74); /*JZ +*/
break;
}
addbyte(10+5+(timing_bt ? 7 : 0)); addbyte(10+5+(timing_bt ? 7 : 0));
addbyte(0xC7); /*MOVL [pc], new_pc*/ addbyte(0xC7); /*MOVL [pc], new_pc*/
addbyte(0x05); addbyte(0x05);
@ -1531,6 +1572,45 @@ static int BRANCH_COND_BE(int pc_offset, uint32_t op_pc, uint32_t offset, int no
static int BRANCH_COND_L(int pc_offset, uint32_t op_pc, uint32_t offset, int not) static int BRANCH_COND_L(int pc_offset, uint32_t op_pc, uint32_t offset, int not)
{ {
switch (codegen_flags_changed ? flags_op : FLAGS_UNKNOWN)
{
case FLAGS_SUB8:
addbyte(0xa0); /*MOV AL, flags_op1*/
addlong((uint32_t)&flags_op1);
addbyte(0x3a); /*CMP AL, flags_op2*/
addbyte(0x05);
addlong((uint32_t)&flags_op2);
if (not)
addbyte(0x7c); /*JL*/
else
addbyte(0x7d); /*JNL*/
break;
case FLAGS_SUB16:
addbyte(0x66); /*MOV AX, flags_op1*/
addbyte(0xa1);
addlong((uint32_t)&flags_op1);
addbyte(0x66); /*CMP AX, flags_op2*/
addbyte(0x3b);
addbyte(0x05);
addlong((uint32_t)&flags_op2);
if (not)
addbyte(0x7c); /*JL*/
else
addbyte(0x7d); /*JNL*/
break;
case FLAGS_SUB32:
addbyte(0xa1); /*MOV EAX, flags_op1*/
addlong((uint32_t)&flags_op1);
addbyte(0x3b); /*CMP EAX, flags_op2*/
addbyte(0x05);
addlong((uint32_t)&flags_op2);
if (not)
addbyte(0x7c); /*JL*/
else
addbyte(0x7d); /*JNL*/
break;
default:
CALL_FUNC(NF_SET); CALL_FUNC(NF_SET);
addbyte(0x85); /*TEST EAX,EAX*/ addbyte(0x85); /*TEST EAX,EAX*/
addbyte(0xc0); addbyte(0xc0);
@ -1549,6 +1629,8 @@ static int BRANCH_COND_L(int pc_offset, uint32_t op_pc, uint32_t offset, int not
addbyte(0x75); /*JNZ +*/ addbyte(0x75); /*JNZ +*/
else else
addbyte(0x74); /*JZ +*/ addbyte(0x74); /*JZ +*/
break;
}
addbyte(10+5+(timing_bt ? 7 : 0)); addbyte(10+5+(timing_bt ? 7 : 0));
addbyte(0xC7); /*MOVL [pc], new_pc*/ addbyte(0xC7); /*MOVL [pc], new_pc*/
addbyte(0x05); addbyte(0x05);
@ -1567,6 +1649,45 @@ static int BRANCH_COND_L(int pc_offset, uint32_t op_pc, uint32_t offset, int not
static int BRANCH_COND_LE(int pc_offset, uint32_t op_pc, uint32_t offset, int not) static int BRANCH_COND_LE(int pc_offset, uint32_t op_pc, uint32_t offset, int not)
{ {
switch (codegen_flags_changed ? flags_op : FLAGS_UNKNOWN)
{
case FLAGS_SUB8:
addbyte(0xa0); /*MOV AL, flags_op1*/
addlong((uint32_t)&flags_op1);
addbyte(0x3a); /*CMP AL, flags_op2*/
addbyte(0x05);
addlong((uint32_t)&flags_op2);
if (not)
addbyte(0x7e); /*JLE*/
else
addbyte(0x7f); /*JNLE*/
break;
case FLAGS_SUB16:
addbyte(0x66); /*MOV AX, flags_op1*/
addbyte(0xa1);
addlong((uint32_t)&flags_op1);
addbyte(0x66); /*CMP AX, flags_op2*/
addbyte(0x3b);
addbyte(0x05);
addlong((uint32_t)&flags_op2);
if (not)
addbyte(0x7e); /*JLE*/
else
addbyte(0x7f); /*JNLE*/
break;
case FLAGS_SUB32:
addbyte(0xa1); /*MOV EAX, flags_op1*/
addlong((uint32_t)&flags_op1);
addbyte(0x3b); /*CMP EAX, flags_op2*/
addbyte(0x05);
addlong((uint32_t)&flags_op2);
if (not)
addbyte(0x7e); /*JLE*/
else
addbyte(0x7f); /*JNLE*/
break;
default:
if (codegen_flags_changed && flags_op != FLAGS_UNKNOWN) if (codegen_flags_changed && flags_op != FLAGS_UNKNOWN)
{ {
addbyte(0x83); /*CMP flags_res, 0*/ addbyte(0x83); /*CMP flags_res, 0*/
@ -1605,6 +1726,8 @@ static int BRANCH_COND_LE(int pc_offset, uint32_t op_pc, uint32_t offset, int no
addbyte(0x75); /*JNZ +*/ addbyte(0x75); /*JNZ +*/
else else
addbyte(0x74); /*JZ +*/ addbyte(0x74); /*JZ +*/
break;
}
addbyte(10+5+(timing_bt ? 7 : 0)); addbyte(10+5+(timing_bt ? 7 : 0));
addbyte(0xC7); /*MOVL [pc], new_pc*/ addbyte(0xC7); /*MOVL [pc], new_pc*/
addbyte(0x05); addbyte(0x05);