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sh2 drc+interpreter, minor improvement for cycle counting

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This commit is contained in:
kub 2021-05-19 19:14:00 +02:00
parent e867ec06e1
commit fa0d0d224e
2 changed files with 8 additions and 7 deletions
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13
cpu/sh2/compiler.c
View file

@ -3540,7 +3540,7 @@ static void REGPARM(2) *sh2_translate(SH2 *sh2, int tcache_id)
// if exiting a pinned loop pinned regs must be written back to ctx
// since they are reloaded in the loop entry code
emith_cmp_r_imm(sr, 0);
EMITH_JMP_START(DCOND_GT);
EMITH_JMP_START(DCOND_GE);
rcache_save_pinned();
if (blx_target_count < ARRAY_SIZE(blx_targets)) {
@ -3564,13 +3564,13 @@ static void REGPARM(2) *sh2_translate(SH2 *sh2, int tcache_id)
emith_cmp_r_imm(sr, 0);
blx_targets[blx_target_count++] =
(struct linkage) { .pc = pc, .ptr = tcache_ptr, .mask = 0x1 };
emith_jump_cond_patchable(DCOND_LE, tcache_ptr);
emith_jump_cond_patchable(DCOND_LT, tcache_ptr);
} else {
// blx table full, must inline exit code
tmp = rcache_get_tmp_arg(0);
emith_cmp_r_imm(sr, 0);
EMITH_SJMP_START(DCOND_GT);
emith_move_r_imm_c(DCOND_LE, tmp, pc);
emith_move_r_imm_c(DCOND_LT, tmp, pc);
emith_jump_cond(DCOND_LE, sh2_drc_exit);
EMITH_SJMP_END(DCOND_GT);
rcache_free_tmp(tmp);
@ -5676,7 +5676,7 @@ int sh2_execute_drc(SH2 *sh2c, int cycles)
// bit11 contains T saved for delay slot
// others are usual SH2 flags
sh2c->sr &= 0x3f3;
sh2c->sr |= cycles << 12;
sh2c->sr |= (cycles-1) << 12;
#if (DRC_DEBUG & 8)
lastpc = lastcnt = 0;
#endif
@ -5687,7 +5687,7 @@ int sh2_execute_drc(SH2 *sh2c, int cycles)
// TODO: irq cycles
ret_cycles = (int32_t)sh2c->sr >> 12;
if (ret_cycles > 0)
if (ret_cycles >= 0)
dbg(1, "warning: drc returned with cycles: %d, pc %08x", ret_cycles, sh2c->pc);
#if (DRC_DEBUG & 8)
if (lastcnt)
@ -5696,7 +5696,7 @@ int sh2_execute_drc(SH2 *sh2c, int cycles)
#endif
sh2c->sr &= 0x3f3;
return ret_cycles;
return ret_cycles+1;
}
static void block_stats(void)
@ -6223,6 +6223,7 @@ u16 scan_block(u32 base_pc, int is_slave, u8 *op_flags, u32 *end_pc_out,
break;
case 1: // SLEEP 0000000000011011
opd->op = OP_SLEEP;
opd->cycles = 3;
end_block = 1;
break;
case 2: // RTE 0000000000101011

2
cpu/sh2/mame/sh2pico.c
View file

@ -221,7 +221,7 @@ int sh2_execute_interpreter(SH2 *sh2, int cycles)
|| pc_expect != sh2->pc) // branched
{
pc_expect = sh2->pc;
if (sh2->icount < 0)
if (sh2->icount <= 0)
break;
}