diff options
| author | Michael Pavone <pavone@retrodev.com> | 2017-05-23 21:07:56 -0700 |
|---|---|---|
| committer | Michael Pavone <pavone@retrodev.com> | 2017-05-23 21:07:56 -0700 |
| commit | 76b3c462c295537542370f50be6bfbf2dfa215b3 (patch) | |
| tree | 2bef8b00be0629c65f883c59d5bdff920cb8e163 /m68k_core_x86.c | |
| parent | 32a5b5aecb7de8db9d848a28f4de38221091e3cf (diff) | |
Fix interrupt latency for move.l with memory destination
Diffstat (limited to 'm68k_core_x86.c')
| -rw-r--r-- | m68k_core_x86.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/m68k_core_x86.c b/m68k_core_x86.c index 07eb1e2..f8c23ab 100644 --- a/m68k_core_x86.c +++ b/m68k_core_x86.c @@ -560,9 +560,7 @@ void translate_m68k_move(m68k_options * opts, m68kinst * inst) int32_t offset; int32_t inc_amount, dec_amount; host_ea src; - if (translate_m68k_op(inst, &src, opts, 0)) { - m68k_check_cycles_int_latch(opts); - } + uint8_t needs_int_latch = translate_m68k_op(inst, &src, opts, 0); reg = native_reg(&(inst->dst), opts); if (inst->dst.addr_mode != MODE_AREG) { @@ -714,11 +712,24 @@ void translate_m68k_move(m68k_options * opts, m68kinst * inst) update_flags(opts, N|Z|V0|C0); } if (inst->dst.addr_mode != MODE_REG && inst->dst.addr_mode != MODE_AREG) { + if (inst->extra.size == OPSIZE_LONG) { + //We want the int latch to occur between the two writes, + //but that's a pain to do without refactoring how 32-bit writes work + //workaround it by temporarily increasing the cycle count before the check + cycles(&opts->gen, BUS); + } + m68k_check_cycles_int_latch(opts); + if (inst->extra.size == OPSIZE_LONG) { + //and then backing out that extra increment here before the write happens + cycles(&opts->gen, -BUS); + } m68k_write_size(opts, inst->extra.size, inst->dst.addr_mode == MODE_AREG_PREDEC); if (inst->dst.addr_mode == MODE_AREG_POSTINC) { inc_amount = inst->extra.size == OPSIZE_WORD ? 2 : (inst->extra.size == OPSIZE_LONG ? 4 : (inst->dst.params.regs.pri == 7 ? 2 : 1)); addi_areg(opts, inc_amount, inst->dst.params.regs.pri); } + } else { + m68k_check_cycles_int_latch(opts); } //add cycles for prefetch |