Mercurial > repos > blastem
changeset 2453:7d7525769ce2
Implement cmp instructions in new 68K core
| author | Michael Pavone <pavone@retrodev.com> |
|---|---|
| date | Mon, 19 Feb 2024 18:14:56 -0800 |
| parents | 8b3daed1c076 |
| children | b1e8e7554f2f |
| files | m68k.cpu |
| diffstat | 1 files changed, 109 insertions(+), 0 deletions(-) [+] |
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--- a/m68k.cpu Mon Feb 19 18:14:12 2024 -0800 +++ b/m68k.cpu Mon Feb 19 18:14:56 2024 -0800 @@ -1280,6 +1280,115 @@ m68k_save_dst Z m68k_prefetch +00001100ZZMMMRRR cmpi + local immed 32 + invalid Z 3 + invalid M 1 + invalid M 7 R 2 + invalid M 7 R 3 + invalid M 7 R 4 + invalid M 7 R 5 + invalid M 7 R 6 + invalid M 7 R 7 + #fetch immediate operand + m68k_prefetch + switch Z + case 2 + immed = prefetch << 16 + m68k_prefetch + immed |= prefetch + if M = 0 + cycles 2 + end + default + immed = prefetch + end + #fetch dst EA + m68k_fetch_dst_ea M R Z + + cmp immed dst Z + update_flags NZVC + m68k_prefetch + +1011DDD1ZZ001SSS cmpm + invalid Z 3 + scratch1 = aregs.S + switch Z + case 0 + ocall read_8 + case 1 + ocall read_16 + case 2 + m68k_read32 + end + scratch2 = scratch1 + if Z + addsize Z aregs.S aregs.S + else + if S = 7 + aregs.S += 2 + else + aregs.S += 1 + end + end + scratch1 = aregs.D + switch Z + case 0 + ocall read_8 + case 1 + ocall read_16 + case 2 + m68k_read32 + end + if Z + addsize Z aregs.D aregs.D + else + if D = 7 + aregs.D += 2 + else + aregs.D += 1 + end + end + cmp scratch2 scratch1 Z + update_flags NZVC + m68k_prefetch + +1011DDD0ZZMMMRRR cmp + invalid M 7 R 5 + invalid M 7 R 6 + invalid M 7 R 7 + invalid Z 3 + m68k_fetch_src_ea M R Z + + if Z = 2 + cycles 2 + end + + cmp src dregs.D Z + update_flags NZVC + m68k_prefetch + +1011DDDZ11MMMRRR cmpa + invalid M 7 R 5 + invalid M 7 R 6 + invalid M 7 R 7 + local size 16 + local ext_src 32 + if Z + size = 2 + else + size = 1 + end + m68k_fetch_src_ea M R size + cycles 2 + if size = 1 + sext 32 src ext_src + meta src ext_src + end + cmp src aregs.D + update_flags NZVC + m68k_prefetch + 0100111001110000 reset if reset_handler pcall reset_handler m68k_reset_handler context