Mercurial > repos > blastem
changeset 2586:6c58cadeabe1
Implement subx in new CPU core
| author | Michael Pavone <pavone@retrodev.com> |
|---|---|
| date | Sat, 08 Feb 2025 16:41:20 -0800 |
| parents | c730067d5f77 |
| children | e04c7e753bf6 |
| files | m68k.cpu |
| diffstat | 1 files changed, 93 insertions(+), 1 deletions(-) [+] |
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--- a/m68k.cpu Sat Feb 08 16:37:15 2025 -0800 +++ b/m68k.cpu Sat Feb 08 16:41:20 2025 -0800 @@ -1128,7 +1128,99 @@ end m68k_save_dst Z m68k_prefetch - + +1001DDD1ZZ000SSS subx_dy_dx + invalid Z 3 + sbc dregs.S dregs.D dregs.D Z + update_flags XNVC + switch Z + case 0 + local tmp8 8 + mov dregs.D tmp8 + if tmp8 + update_flags Z0 + end + case 1 + local tmp16 16 + mov dregs.D tmp16 + if tmp16 + update_flags Z0 + end + case 2 + cycles 4 + if dregs.D + update_flags Z0 + end + end + m68k_prefetch + +1001DDD1ZZ001SSS subx_ay_ax + invalid Z 3 + if Z + decsize Z aregs.S aregs.S + else + switch S + case 7 + sub 2 aregs.S aregs.S + default + decsize Z aregs.S aregs.S + end + end + #predec penalty on src only + cycles 2 + mov aregs.S scratch1 + switch Z + case 0 + ocall read_8 + case 1 + ocall read_16 + case 2 + m68k_read32 + end + mov scratch1 scratch2 + if Z + decsize Z aregs.D aregs.D + else + switch D + case 7 + sub 2 aregs.D aregs.D + default + decsize Z aregs.D aregs.D + end + end + mov aregs.D scratch1 + switch Z + case 0 + ocall read_8 + case 1 + ocall read_16 + case 2 + m68k_read32 + end + sbc scratch2 scratch1 scratch1 Z + update_flags XNVC + switch Z + case 0 + local tmp8 8 + mov dregs.D tmp8 + if tmp8 + update_flags Z0 + end + case 1 + local tmp16 16 + mov dregs.D tmp16 + if tmp16 + update_flags Z0 + end + case 2 + if dregs.D + update_flags Z0 + end + end + mov aregs.D scratch2 + m68k_write_size Z 0 + m68k_prefetch + 1110CCC0ZZ001RRR lsri invalid Z 3 switch C