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Commit graph pcem/src/386_dynarec.c
Author SHA1 Message Date
SarahW
cd9e228b6d Move CODEBLOCK_IN_DIRTY_LIST check to after checking if block needs to be flushed. Improves performance in Eradicator. 2019-03-16 15:46:48 +00:00
SarahW
ab124776a0 Rework self modifying code handling. 
Code blocks now have a varying level of granularity in the page and dirty masks.
Most blocks have 64-byte granularity, but blocks that are repeatedly modified
drop to 1-byte granularity. This reduces the maximum size of the affected block
significantly, but reduces recompilation due to data located too close to code.

If the block is still marked as dirty, then it is recompiled without any
immediate instruction parameters being baked into the recompiled code, instead
being fetched from the RAM array as needed. This severely reduces recompilation
rates on some SMC-heavy games, eg Duke Nukem 3D, System Shock, Screamer etc,
giving a major speedup.
 2019-03-16 14:53:26 +00:00
SarahW
1b8a1e79af Move common 386+ functions and variables out of 386.c and 386_dynarec.c and into new 386_common.c. 2019-02-07 22:09:59 +00:00
SarahW
dd68b19f0a Second CPU sanitising pass. 2019-02-07 21:53:44 +00:00
SarahW
1af0b660b3 First pass at sanitising CPU headers. 2019-02-07 21:30:53 +00:00
SarahW
87031d4d09 Remove readmemb386l() and writememb386l(). 2019-02-07 20:18:03 +00:00
SarahW
2ccf771cf3 Cleaned up exec386_dynarec() a bit. 2019-02-01 20:11:08 +00:00
SarahW
ca89a51478 Remove redundant oldcs variable - when processing an exception, oldcs and CS are the same. 2019-01-28 20:00:49 +00:00
SarahW
427aa72a15 Don't set cpu_state.oldpc at the start of every iteration of the recompiler main loop. 2019-01-28 19:25:09 +00:00
SarahW
889ca7f3f2 Remove test-USE32-and-mask-PC operation from interpreter as well. 2019-01-27 21:22:35 +00:00
SarahW
ee186dbb0d Remove test-USE32-and-mask-PC operation following code block execution. Instead, ensure that all recompiled instructions mask PC correctly. 2019-01-27 20:54:22 +00:00
SarahW
7b3b6a745d Remove pointless NULL check against block in recompiler loop. 2019-01-27 20:52:59 +00:00
SarahW
6c65c34bd3 Don't clear trap at the start of the recompiler loop; instead, clear it when actually taking a trap. 2019-01-27 20:52:37 +00:00
SarahW
93b42d43d5 Remove pointless setting of cpu_state.op32 and cycdiff at start of recompiler main loop. 2019-01-27 20:52:02 +00:00
SarahW
c3250ca63e Don't set oldcpl at the start of each instruction; instead, only set it following a successful CS load. 2019-01-27 20:51:13 +00:00
SarahW
43b5b83644 Reduce codeblock_hash table to uint16_t. 2018-11-30 13:18:56 +00:00
SarahW
9ff1c7f409 Further reductions to codeblock_t size - replace link pointers with uint16_t block indicies, shrink ins to uint8_t, remove endpc. codeblock_t now fits in a 64-byte cacheline on 32-bit platforms. 2018-11-29 20:05:12 +00:00
SarahW
2007c25177 Start reducing size of codeblock_t structure. 
Re-arrange all variables needed to run a block to fit in a single cache line.
 2018-11-28 20:29:48 +00:00
SarahW
a4d3aa1912 Move flags and eflags variables into cpu_struct. 2018-11-28 09:42:04 +00:00
SarahW
d9e38fe37c Fix masking of FPU top-of-stack in several places. Fixes DOS Quake. 2018-10-09 13:51:05 +01:00
SarahW
a7d006b637 Rewrote timer code. 
The new code is based on timestamps, rather than delays. This eliminates the
need to update every timer in timer_process(), which cost a non-trivial amount
of CPU time on low-end machines.

This involved changes to every user of the timer code, so this change almost
certainly introduces bugs.
 2018-08-02 22:06:10 +01:00
SarahW
91143d3c68 Move CPU segment structures into cpu_state structure. 2018-07-22 12:56:03 +01:00
SarahW
0f0a1c3223 Perform NULL segment checks upfront in opcode handlers, rather than on every memory access. 
This removes the need to pass the segment to readmem*l()/writemem*l().
 2018-07-18 22:10:18 +01:00
SarahW
03fe25d818 First stage of dynamic recompiler rewrite. 
Basic IR generation calls C implementation of all instructions.
Backend generation implemented for x86, x86-64, ARM and ARM64.
 2018-06-17 20:26:15 +01:00
SarahW
2957dae2d5 Fixes to x86_was_reset handling. Based on patch from Greatpsycho. 2018-01-08 21:10:46 +00:00
SarahW
f336dd9589 Implemented IDT limit checking on real mode interrupts. Patch from Greatpsycho. 2018-01-08 20:54:19 +00:00
SarahW
4af811699e Fix dynarec timer granularity to 5us. Fixed speed issues in Tubular Worlds. 2017-11-19 21:55:49 +00:00
SarahW
717d815604 Tweak flat DS/SS dynarec optimisation, should reduce block churn when routines are called both with and without flat DS/SS. 
Fixed incorrect STACK32 flag when entering V86 mode that was hidden by block churn.
Protected and V86 mode status now considered when selecting block.
 2017-11-15 21:55:27 +00:00
SarahW
c71963727a Recompiler now uses logical address of 0xffffffff rather than 0 to represent invalid block. Fixes some Unixes when recompiler enabled. 2017-10-15 21:32:01 +01:00
SarahW
5f0d43f782 Prefetch simulation no longer counts prefixes when prefetch calculation disabled (eg when CPU cache enabled). Fixes hang on reset on 486+ CPUs. 2017-10-15 21:29:49 +01:00
SarahW
132a2eb110 Add NMI support to dynamic recompiler. 2017-10-13 22:42:59 +01:00
SarahW
a96e87527e Reorganised REP instructions. 2017-07-20 21:06:21 +01:00
SarahW
1f33b52451 Added VME emulation to Intel DX4, Pentium and Pentium MMX. 
Temporarily disabled recompilation of CLI and STI.
 2017-06-30 20:42:19 +01:00
SarahW
3a7c4687d6 Reduce self modifying code granularity from 64 bytes to 16. 2017-06-13 21:05:10 +01:00
SarahW
083ca3d4a2 Slight optimisation when DS/SS are 'flat' (base=0, limit=4G). 2017-05-24 21:50:37 +01:00
SarahW
2b892d2a7a Fixed compiler warnings for Windows builds. 
Added -Werror to Windows makefiles.
 2017-04-11 19:34:41 +01:00
SarahW
7c7961c578 Fixed inconsistent declaration of biosmask 2016-12-17 21:53:58 +00:00
SarahW
bfc69a4bea Cleaned up ibm.h a bit 2016-11-28 20:06:17 +00:00
SarahW
a4f3b2013e Added AMI 386DX and MR 386DX models (both based on OPTi 495 chipset). AMI 386DX supports external cache, useful for with prefetch emulation. 
Also commit a few fixes required :
- Set EDX correctly on soft reset
- LOCK NOP is now treated as an illegal instruction
- Tweaks to FDC sense interrupt handling following FDC reset
 2016-11-27 21:53:13 +00:00
SarahW
1b73963997 Added prefetch timing approximation for 286/386 CPUs, with configurable memory timing. 2016-11-25 21:32:02 +00:00
SarahW
a174a88c49 Codeblock tree now includes both physical and virtual addresses into key. Fixes performance issues with Windows 3.1. 2016-11-08 21:30:48 +00:00
SarahW
75f9316c11 x86-32 recompiler compiles FPU instructions using direct access to register stack when top-of-stack is static. Minor speedup. 2016-09-11 15:38:05 +01:00
SarahW
eb126fd822 Moved more variables into cpu_state structure. 2016-08-21 21:28:23 +01:00
SarahW
c664682758 Move some more variables into cpu_state structure. Minor speedup (~2%). 2016-08-17 21:28:16 +01:00
SarahW
535604b760 Pack decoded ModR/M data into a single word - minor recompiler speedup. 2016-08-14 16:29:54 +01:00
SarahW
42237ac1f8 Recompiler now only recompiles a block after seeing it twice. Improves performance on stuff that uses self modifying code - eg Doom, Duke Nukem 3D, Windows 95 idle 2016-07-31 12:33:37 +01:00
SarahW
4ae8f2d260 REP instructions now handle trap flag correctly, Windows NT 3.51 now works on 386 systems. 2016-06-28 21:58:21 +01:00
SarahW
7fbb99fe75 Don't quit emulator on triple fault when dynamic recompiler enabled. 2016-05-21 21:14:00 +01:00
SarahW
52636936e9 Limited how long REP instructions are uninterruptable for, improves sound on games/demos that use high-frequency timer interrupts for sound output (eg Crystal Dream, Cronologia) 2016-05-03 21:31:05 +01:00
SarahW
c81a91fd72 Moved integer registers, PC and flags_* variables into new cpu_state structure. Reduces recompiled code size slightly, small speedup (1-3%). 2016-04-20 21:39:41 +01:00