Thomas Harte
b7bed027d7
Ensures the value initially loaded to A7 is aligned.
...
This is a bit of a guess; it's likely to be true though per the rule that A7 is always kept aligned.
2021-07-25 19:55:23 -04:00
Thomas Harte
6e4b8d58a5
Completes [[fallthrough]]s.
2020-06-19 23:50:37 -04:00
Thomas Harte
945a9da94f
Adds further [[fallthrough]]s.
2020-06-19 23:44:20 -04:00
Thomas Harte
a3d4c7599b
Attempts fully to capture 68000 state.
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Albeit that it can't be put back yet.
2020-05-18 23:55:54 -04:00
Thomas Harte
f0d5bbecf2
Introduces a test of stack contents after an address error.
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Fixes: stacked PC, address of fault.
2020-01-04 23:22:07 -05:00
Thomas Harte
a28c52c250
Fixes A7-relative JSRs.
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I completely withdraw my earlier statement re: the test cases.
2020-01-04 22:22:33 -05:00
Thomas Harte
5be30b1f7b
Introduces further comparative tests, prompting a new CHK fix.
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Specifically: how to set N when both is_under and is_over are true, and to eliminate a failure fully to prefetch in the longer addressing modes.
2020-01-01 19:11:36 -05:00
Thomas Harte
1de4f179c0
Adds more thorough comment on the bus program used.
2019-12-25 19:49:49 -05:00
Thomas Harte
096b447b4b
Corrects MOVE -(An), SR/CCR, which was not previously decrementing.
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Also adds a safety check against other instances of the same error. There seem to be none.
2019-12-16 22:38:54 -05:00
Thomas Harte
8be26502c4
Fixes NBCD -(An)+, adds some additional comments.
2019-12-16 20:01:19 -05:00
Thomas Harte
dc1abd874e
Corrects indentation typo.
2019-12-14 23:52:53 -05:00
Thomas Harte
b12136691a
Corrects comment.
2019-11-18 23:46:33 -05:00
Thomas Harte
db03b03276
Corrects [AND/OR/EOR].bw Dn, -(An) to decrement destination.
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It was previously doing a predecrement on the internal source address, which is unused. This fixes at least Dan Dare III and Silkworm.
2019-11-09 11:25:23 -05:00
Thomas Harte
b7b62aa3f6
Resolves some type conversion warnings.
2019-07-26 23:20:40 -04:00
Thomas Harte
5769944918
Shrinks MicroOp struct size from 16 bytes to 4.
2019-07-25 10:14:36 -04:00
Thomas Harte
1327de1c82
Slims the Program struct down to 8 bytes total.
2019-07-24 22:02:50 -04:00
Thomas Harte
827c4e172a
Cuts a third from the Program struct.
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Observation: [source/destination]_address are always one of the address registers. So you can fit both within a single byte.
Net effect: around a 12% reduction in execution costs, given that this reduces the size of the instructions table from 3mb to 2mb.
2019-07-24 18:39:36 -04:00
Thomas Harte
c300bd17fa
Regularises as many source/destination sets as fit the current setter.
2019-07-24 18:22:44 -04:00
Thomas Harte
5078f6fb5c
Marginally reduces MOVE heft.
2019-07-09 18:07:11 -04:00
Thomas Harte
c4cbe9476c
Corrects EA selection logic, fixing MOVEP.
2019-07-02 13:54:21 -04:00
Thomas Harte
c5039a4719
Imports ANDI, ORI and EORI to SR tests.
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Hence corrects supervisor/user privileges for SR/CCR.
2019-06-28 15:05:46 -04:00
Thomas Harte
d81053ea38
Invents some additional PEA tests, and further fixes PEA.
2019-06-27 17:59:03 -04:00
Thomas Harte
8d39c3bc98
Takes a shot at fixing PEA for A7-relative addresses.
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Unit tests required. Tomorrow.
2019-06-26 23:24:54 -04:00
Thomas Harte
538aecb46e
Imports CMP tests, and fixes CMP.l timing.
2019-06-26 22:02:04 -04:00
Thomas Harte
dbdbea85c2
Imports CMPA tests, and fixes CMPA.w.
2019-06-26 21:42:48 -04:00
Thomas Harte
ba2224dd06
Imports NEGX tests and thereby fixes NEGX's zero flag.
2019-06-26 19:39:04 -04:00
Thomas Harte
2c813a2692
Imports CMPM tests and fixes CMPM.bw source/destination order.
2019-06-25 21:46:01 -04:00
Thomas Harte
d2cb595b83
Proactively attempts to fix CMPM PostInc addressing.
2019-06-25 21:24:03 -04:00
Thomas Harte
ecb5a0b8cc
Incorporates ADDX tests and fixes ADDX PreDec.
2019-06-25 19:18:07 -04:00
Thomas Harte
31edb15369
Reduces 68000 startup costs a little further.
2019-06-25 17:41:13 -04:00
Thomas Harte
9a666fb8cc
Imports NEG tests and fixes NEG.l Dn timing.
2019-06-24 19:43:30 -04:00
Thomas Harte
0e208ed432
Fixes cycle counting in the test machine.
2019-06-24 17:55:09 -04:00
Thomas Harte
3ec9a1d869
Incorporates JMP tests, fixes JSR (xxx).l timing.
2019-06-24 15:36:33 -04:00
Thomas Harte
faef917cbd
Improves resizeable microcycle test.
2019-06-24 10:55:22 -04:00
Thomas Harte
d27ba90c07
Attempts to introduce more rigour to variable-length instruction handling.
2019-06-24 10:43:28 -04:00
Thomas Harte
d50fbfb506
Imports EXG and PEA tests, and fixes EXG timing.
2019-06-23 22:21:25 -04:00
Thomas Harte
b63231523a
Completes import of ROL tests.
2019-06-23 17:33:12 -04:00
Thomas Harte
8c8493bc9d
Ensures proper loading of the SP at reset.
2019-06-21 18:20:26 -04:00
Thomas Harte
ccfe1b13cb
Imports DIVS, MULS and MOVE from SR tests.
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Not all passing.
2019-06-21 16:03:11 -04:00
Thomas Harte
79d8d27b4c
Reintroduces use of locations_by_bus_step_ to decrease 68000 construction time.
2019-06-20 15:10:11 -04:00
Thomas Harte
440f52c943
Incorporates TRAP test.
2019-06-19 21:18:30 -04:00
Thomas Harte
8dace34e63
Imports third-party tests for ABCD, and thereby fixes ABCD.
2019-06-19 18:13:06 -04:00
Thomas Harte
c5b036fedf
Ensures aborted decodes don't overwrite prior correct ones.
2019-06-19 17:00:44 -04:00
Thomas Harte
e26ddd0ed5
Corrects address fetches for CMPI.l #, (xxx).w.
2019-06-19 13:52:56 -04:00
Thomas Harte
ca83431e54
Fixed: Scc is a byte operation.
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It was, until now, post-incrementing and pre-decrementing registers other than A7 incorrectly.
2019-06-19 13:15:12 -04:00
Thomas Harte
feafd4bdae
Eliminates further type conversion warnings.
2019-06-13 10:20:17 -04:00
Thomas Harte
4d4ddded6d
Fixes register-relative JMP and JSR.
2019-06-03 15:29:50 -04:00
Thomas Harte
035f07877c
Reduces conversions to vector.
2019-05-30 12:08:35 -04:00
Thomas Harte
c86fe9ada9
Ensures replace_write_values works in release builds.
2019-05-29 19:00:53 -04:00
Thomas Harte
541b75ee6e
Further fixes PEA, and OR/AND/EOR Dn, (An).
2019-05-29 14:37:15 -04:00
