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85f814c632
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1240 Commits

Author SHA1 Message Date
Thomas Harte
85f814c632 Attempt to build fixed operations into type. 
This simplifies callees and should make all helper functions automatically able to optimise themselves for fixed operations.
 2023-12-21 23:08:18 -05:00
Thomas Harte
213dfe037d Shift operation stuff into its own namespace, making data_select_active a free function. 2023-12-21 16:03:53 -05:00
Thomas Harte
faaa89bb67 Eliminate all reference to EmuTOS. 2023-12-21 15:28:45 -05:00
Thomas Harte
1f2fbccf1f Update documentation. 2023-12-20 22:05:45 -05:00
Thomas Harte
356d8f469a Correct various throaway -> throwaway. 2023-12-20 22:02:51 -05:00
Thomas Harte
60bd81c4cc Use X. 2023-12-20 22:02:51 -05:00
Thomas Harte
38c3d302a3 Restore JMP (abs, x) length. 2023-12-20 22:02:51 -05:00
Thomas Harte
24c80060c8 Revise guess on JMP (abs, x). 2023-12-20 22:02:51 -05:00
Thomas Harte
d33deb676f Adjust (abs, y) addressing. 2023-12-20 22:02:19 -05:00
Thomas Harte
bf5ed98f35 Generalise 65c02 behaviour. 
Partly to convince myself:
1. this change alters behaviour of `CycleAddXToAddressLowRead`
2. which affects only `AbsoluteXw` and the 65c02-specific `JMP (abs, x)`;
3. `AbsoluteXw` is then used only by `AbsoluteXWrite` and `AbsoluteXReadModifyWrite`;
4. `AbsoluteXWrite` is used for abs, x addressing by `SHY`, `STA` and `STZ`;
5. `AbsoluteXReadModifyWrite` is used for `ASL`, `ASO`, `ROL`, `RLA`, `LSR`, `LSE`, `ROR`, `RRA`, `DEC`, `DCP`, `INC` and `INS`.

... though many of the latter are replaced by instance of `FastAbsoluteXReadModifyWrite` for the 65c02 which don't include a dummy
access at all if the page boundary is crossed so the issue is moot.
 2023-12-20 22:02:14 -05:00
Thomas Harte
f25aaf2bb3 Adjust 65c02 STA abs,x behaviour. 2023-11-29 15:32:02 -05:00
Thomas Harte
7171e24ccf Enable further compile-time optimisations. 2023-11-28 13:50:53 -05:00
Thomas Harte
36a4629ce0 Explain new semantics. 2023-11-27 21:49:57 -05:00
Thomas Harte
5c7f94d2ef Introduce the possibility of operation type as a template parameter. 
It's already proven possible to provide this for instruction fetch, so I think it'll immediately be a win. But more importantly it opens a path forwards for further improvement.
 2023-11-27 11:48:34 -05:00
Thomas Harte
e46e42d896 This is the same test either way around. 2023-10-09 16:47:02 -04:00
Thomas Harte
1cb26cb141 Pull add/sub distinction into templates. 2023-10-09 16:40:50 -04:00
Thomas Harte
873b1122ab Correct SHA, SHX, SHY, SHS when page boundary crossed. 2023-09-21 15:31:04 -04:00
Thomas Harte
74b5ad93c4 Don't necessarily apply D for ARR. 2023-09-20 10:17:00 -04:00
Thomas Harte
43dfb729d3 Explain even better. 2023-09-02 14:45:53 -04:00
Thomas Harte
543be49cf8 Merge branch 'master' into 65C02BCDTest 2023-09-01 16:39:18 -04:00
Thomas Harte
1fb278c9f1 Fix abs,x NOP length. 2023-09-01 14:31:21 -04:00
Thomas Harte
19ec63b4fb Add exposition, slightly simplify, unbreak INS. 2023-09-01 09:29:35 -04:00
Thomas Harte
4d6ffa7a2e With some degree of hit and hope, correct 65C02 results. 2023-08-31 15:28:59 -04:00
Thomas Harte
39ee75d94a Clean up decimal SBC implementation. 2023-08-31 15:02:17 -04:00
Thomas Harte
13be247495 Comment. 2023-08-30 23:08:42 -04:00
Thomas Harte
cdcac7c11c Simplify top nibble handling. 2023-08-30 23:07:54 -04:00
Thomas Harte
67cd5dd63b Simplify top nibble decision. 2023-08-30 23:06:00 -04:00
Thomas Harte
139a1a2acc Clean up decimal ADC. 2023-08-30 23:04:38 -04:00
Thomas Harte
5dae726857 Differentiate non-fetching and fetching NOPs. 2023-08-29 16:50:39 -04:00
Thomas Harte
7815d18676 Merge branch 'master' into 65816StackAgain 2023-08-19 15:55:45 -04:00
Thomas Harte
ca75822dbe Fix restart_operation_fetch. 2023-08-17 15:42:34 -04:00
Thomas Harte
d9df568dab Add faulty restart_operation_fetch. 2023-08-17 15:38:28 -04:00
Thomas Harte
26343148ae Use simplified control lines when appropriate. 2023-08-17 15:32:02 -04:00
Thomas Harte
fd0fe66851 Omit unsupported registers and flags. 2023-08-17 15:24:08 -04:00
Thomas Harte
833613b68a Fix S top byte overwrite. 2023-08-17 14:50:55 -04:00
Thomas Harte
42024c1573 Don't allow setting of an invalid S. 2023-08-07 09:19:20 -04:00
Thomas Harte
54103f1f34 Fix SH=1 reset; appropriate TCS. 2023-08-05 15:06:18 -04:00
Thomas Harte
c0eb401d04 Add a between-instructions enforcement of SH = 1. 2023-08-05 14:57:43 -04:00
Thomas Harte
2262725010 Reveal 16-bit stack pointer when asked, regardless of mode. 2023-07-31 17:08:02 -04:00
Thomas Harte
e61a4eb5a9 Regularise PHD and PLD. 2023-07-30 16:36:29 -04:00
Thomas Harte
acd7f9f4cd Fix stack usage of JSL. 2023-07-30 16:34:42 -04:00
Thomas Harte
9f1a657cc4 Fix stack usage of PEA. 2023-07-30 16:33:44 -04:00
Thomas Harte
e52d1866ab Fix PEI stack usage. 2023-07-30 16:32:56 -04:00
Thomas Harte
a02b8222fa Fix stack usage of PER. 2023-07-30 16:29:56 -04:00
Thomas Harte
3762ee1a63 Fix stack usage of PHD. 2023-07-30 16:29:15 -04:00
Thomas Harte
3ec61e8770 Fix stack usage of RTL. 2023-07-30 16:27:13 -04:00
Thomas Harte
2f7dd0b01a Correct stack behaviour of PLD. 2023-07-30 16:26:29 -04:00
Thomas Harte
3a02c22072 Provide an always-16bit-address route to the stack. 2023-07-30 16:25:51 -04:00
Thomas Harte
0f1468adfd Correct wrapping behaviour for (d, x). 2023-07-28 13:39:21 -04:00
Thomas Harte
e9347168e6 Don't alter the data bank upon BRK, COP, IRQ, etc. 2023-07-28 10:53:02 -04:00