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Improve Cyrix 6x86 AGI timing.

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This commit is contained in:
SarahW 2018-03-24 16:58:32 +00:00
commit 0209adc35e
1 changed files with 20 additions and 8 deletions
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28
src/codegen_timing_686.c
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@ -56,6 +56,7 @@ static uint32_t prev_regmask;
static uint64_t *prev_deps;
static uint32_t prev_fetchdat;
static uint32_t last_regmask_modified;
static uint32_t regmask_modified;
static uint32_t opcode_timings[256] =
@ -773,7 +774,7 @@ static inline int COUNT(uint32_t c, int op_32)
void codegen_timing_686_block_start()
{
prev_full = decode_delay = 0;
regmask_modified = 0;
regmask_modified = last_regmask_modified = 0;
}
void codegen_timing_686_start()
@ -798,7 +799,16 @@ static int check_agi(uint64_t *deps, uint8_t opcode, uint32_t fetchdat, int op_3
if (addr_regmask & IMPL_ESP)
addr_regmask |= (1 << REG_ESP);
return regmask_modified & addr_regmask;
if (regmask_modified & addr_regmask)
{
regmask_modified = 0;
return 2;
}
if (last_regmask_modified & addr_regmask)
return 1;
return 0;
}
void codegen_timing_686_opcode(uint8_t opcode, uint32_t fetchdat, int op_32)
@ -940,8 +950,7 @@ void codegen_timing_686_opcode(uint8_t opcode, uint32_t fetchdat, int op_32)
if (regmask & IMPL_ESP)
regmask |= SRCDEP_ESP | DSTDEP_ESP;
if (check_agi(prev_deps, prev_opcode, prev_fetchdat, prev_op_32))
agi_stall = 2;
agi_stall = check_agi(prev_deps, prev_opcode, prev_fetchdat, prev_op_32);
/*Second instruction in the pair*/
if ((timings[opcode] & PAIR_MASK) == PAIR_NP)
@ -951,6 +960,7 @@ void codegen_timing_686_opcode(uint8_t opcode, uint32_t fetchdat, int op_32)
codegen_block_cycles += COUNT(prev_timings[prev_opcode], prev_op_32) + decode_delay + agi_stall;
decode_delay = (-COUNT(prev_timings[prev_opcode], prev_op_32)) + 1 + agi_stall;
prev_full = 0;
last_regmask_modified = regmask_modified;
regmask_modified = prev_regmask;
// pclog("Not pairable %i\n", COUNT(prev_timings[prev_opcode], prev_op_32) + decode_delay);
}
@ -962,6 +972,7 @@ void codegen_timing_686_opcode(uint8_t opcode, uint32_t fetchdat, int op_32)
codegen_block_cycles += COUNT(prev_timings[prev_opcode], prev_op_32) + decode_delay + agi_stall;
decode_delay = (-COUNT(prev_timings[prev_opcode], prev_op_32)) + 1 + agi_stall;
prev_full = 0;
last_regmask_modified = regmask_modified;
regmask_modified = prev_regmask;
// pclog("Not pairable %i\n", COUNT(prev_timings[prev_opcode], prev_op_32) + decode_delay);
}
@ -972,6 +983,7 @@ void codegen_timing_686_opcode(uint8_t opcode, uint32_t fetchdat, int op_32)
codegen_block_cycles += COUNT(prev_timings[prev_opcode], prev_op_32) + decode_delay + agi_stall;
decode_delay = (-COUNT(prev_timings[prev_opcode], prev_op_32)) + 1 + agi_stall;
prev_full = 0;
last_regmask_modified = regmask_modified;
regmask_modified = prev_regmask;
// pclog("Not pairable %i\n", COUNT(prev_timings[prev_opcode], prev_op_32) + decode_delay);
}
@ -984,12 +996,12 @@ void codegen_timing_686_opcode(uint8_t opcode, uint32_t fetchdat, int op_32)
if (!t_pair)
fatal("Pairable 0 cycles! %02x %02x\n", opcode, prev_opcode);
if (check_agi(deps, opcode, fetchdat, op_32))
agi_stall = 2;
agi_stall = check_agi(deps, opcode, fetchdat, op_32);
codegen_block_cycles += t_pair + agi_stall;
decode_delay = (-t_pair) + 1 + agi_stall;
last_regmask_modified = regmask_modified;
regmask_modified = get_dstdep_mask(deps[opcode], fetchdat, bit8) | prev_regmask;
prev_full = 0;
// pclog("Pairable %i %i %i %02x %02x\n", t_pair, t1, t2, opcode, prev_opcode);
@ -1005,11 +1017,11 @@ void codegen_timing_686_opcode(uint8_t opcode, uint32_t fetchdat, int op_32)
/*Instruction not pairable*/
int agi_stall = 0;
if (check_agi(deps, opcode, fetchdat, op_32))
agi_stall = 2;
agi_stall = check_agi(deps, opcode, fetchdat, op_32);
codegen_block_cycles += COUNT(timings[opcode], op_32) + decode_delay + agi_stall;
decode_delay = (-COUNT(timings[opcode], op_32)) + 1 + agi_stall;
last_regmask_modified = regmask_modified;
regmask_modified = get_dstdep_mask(deps[opcode], fetchdat, bit8);
// pclog("Not pairable %i\n", COUNT(timings[opcode], op_32) + decode_delay);
}