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Author SHA1 Message Date
David Given 88fd7b3cdc Add a 'kill' pseudoinstruction to the 8080 assembler, which marks when the code 
generator is finished with a register; use this to create some more effective
peephole optimiser rules.
 2019-03-08 23:06:34 +01:00
David Given 12a0421988 Minor improvements to the way types are expanded (should avoid embarassing ands 
with 0xff).
 2019-02-17 10:09:22 +01:00
David Given 61d623c4d6 Add a few minor top optimisations. 2019-02-16 01:18:31 +01:00
David Given 6a8b298861 Fix typo where I was confusing sbi and sui, with hilarious results. 2019-02-16 01:18:21 +01:00
David Given 4474d6433a Loading large constants now computes the stack offset correctly. 2019-02-15 23:03:01 +01:00
David Given 34c67698ef Generate the proper function prologues for big stack frames. 2019-02-15 23:01:33 +01:00
David Given 8ca4d6ea1e Cleanup. 2019-02-15 22:26:14 +01:00
David Given c9467b683a Add rules for converting smallnconst2 and smallpconst2 to registers, to stop 
the conversion from happening via the stack. Star Trek goes from 39450 to 39384
bytes.
 2019-02-15 22:20:07 +01:00
David Given afd45acb89 Using regpair instead of hl_or_de is not, in fact, safe until we've stopped 
using bc.
 2019-02-15 21:38:17 +01:00
David Given d63a359a49 Fix nearly all the comparisons, a lot of which were broken. Using a rst for 
unsigned comparisons is surprisingly not that useful due to marshalling
overhead; it's only four bytes to do inline (plus jc), or six for a constant.
Also add some useful top optimisations.  Star Trek goes from 39890 to 39450
bytes.
 2019-02-15 21:30:27 +01:00
David Given 91c75f81b5 Call cmps rather than cmpu for bge... make cmps and cmpu rsts. Apply various 
other tiny optimisations.
 2019-02-15 00:38:39 +01:00
David Given 2924ce8ffa Use nicely optimised helper tools to do signed comparisons of words. Star Trek 
goes from 40452 to 39890 bytes.
 2019-02-14 23:57:55 +01:00
David Given 3c3d2a4520 Fix bad helper tool invocation for inl with faddrn. 2019-02-14 23:21:47 +01:00
David Given 8eaa11ac72 Turns out that every time the compiler tried to do a stack retraction with asp, 
it would flush registers onto the stack. This stops it doing this. Star Trek
goes from 40779 to 40452 bytes.
 2019-02-14 00:05:08 +01:00
David Given 6e3ba8e9a0 Merge from default. 2019-02-13 22:46:00 +01:00
David Given 79a38ecc08 Instead of using parameterised rsts for stack access, add a huge swathe of 
automatically built helper tools. Star Trek goes up from 40243 to 40779 bytes,
but should be a lot faster.
 2019-02-13 22:45:22 +01:00
David Given 8200f041c2 Fix issue with logical operations and small signed constants which turned out 
to affect multiple platforms.
 2019-02-13 20:56:10 +01:00
David Given f4b45f1ed7 Fix bad code generation due to not correctly flushing the stack before 
comparisons.
 2019-02-12 22:19:07 +01:00
David Given 360e1525ae Replace the non-working Z80 style signed comparison sign adjustment with 
something which actually works on the 8080. Sadly, Star Trek is up to
40243 bytes again.
 2019-02-12 11:57:37 +01:00
David Given e8994afdf0 Apply Alan Cox's patch to add the 8085 extended instructions to the i80 
assembler.
 2019-02-11 21:14:35 +01:00
David Given f1b128baeb Signed comparisons now work correctly; sadly, Star Trek increases from 39656 to 
39726 bytes. Note that the emulator doesn't set P/V correctly and all the tests
fail. Testing in z80ex works fine.
 2019-02-11 20:46:06 +01:00
David Given fca54ccc1b Improve subtractions, using dad and inline constants where possible. Shrinks 
Star Trek from 39740 to 39656 bytes.
 2019-02-10 19:40:48 +01:00
David Given 7d34cd7407 Simplify simple comparisons and use inlie constants where possible. Reduces 
Star Trek from 39771 to 39740 bytes.
 2019-02-10 19:22:43 +01:00
David Given 35d1f36ca4 Use pop rather than inx;inx to retract the stack; consumes a register but 
halves the number of calls. Reduces Star Trek from 39976 to 39771 bytes.
 2019-02-10 18:57:20 +01:00
David Given b34ff2bdec Teach the i80 code generator how to do left shifts by using dad hl; prevents it 
from calling out to .sli2 for simple shifts. Shrinks Star Trek from 40055 bytes
to 39976.
 2019-02-10 18:44:47 +01:00
David Given c95d5db372 Replace mkstemp() with the more modern and safer and simpler tmpfile(). 2019-02-10 14:36:15 +01:00
David Given 63fa647bc9 freopen() appears to be problematic on OSX; as it's only ever used to rewind 
files, replace with rewind().
 2019-02-10 14:32:17 +01:00
David Given 1dfafe070c Better error reporting. 2019-02-10 14:19:18 +01:00
David Given 58698bed19 Removed a whole bunch of old strcpy() prototypes in favour of <string.h>. 2019-02-10 13:20:04 +01:00
David Given 10b509d6b6 Add rst 3 to get the address of a frame variable; lots of rule overhaulage. 
Reduces Star Trek from 41821 to 41055 bytes.
 2019-02-09 13:29:41 +01:00
David Given 0de5001f82 Make sign extension much less horrible. 2019-02-08 23:16:57 +01:00
David Given 0ac145a0d1 Add tests for simple and, or, and xor; drastically improve the i80 code 
generation for these.
 2019-02-08 22:38:07 +01:00
David Given a91ab5c599 Somehow the implementation of rst 2 got lost, with hilarious results. Also fix 
some register corruption issues (I hope).
 2019-02-08 21:35:14 +01:00
David Given d319c7d679 Fix swapped bytes in probyte which was causing junk stack frames. 2019-02-08 08:09:55 +01:00
David Given a5bf2932c8 Add rst 1 to store frame variables. Reduces Star Trek from 42339 to 41821 
bytes.
 2019-02-07 09:31:38 +01:00
David Given 67a9be26d1 Fix warnings. 2019-02-07 09:09:31 +01:00
David Given 9d8ea79c7f rst 1 now takes an eight-bit parameter, not a 16 bit one. Reduces Star Trek 
again from 43205 to 42339 bytes.
 2019-02-07 08:45:20 +01:00
David Given 5ac280026e Experimentally use rst 1 to optimise frame variable loads. Reduces Star Trek 
from 43892 to 43205 bytes.
 2019-02-07 00:06:32 +01:00
David Given 08b92153a0 Use a helper function for cai --- only saves two bytes per invocation, but is 
much less embarassing.
 2019-02-06 20:36:23 +01:00
David Given 2b0629f87f Common out boilerplate function prologue code; shrinks Star Trek from 44256 to 
43892 bytes.
 2019-02-06 16:06:07 +01:00
David Given b77f616598 Run through clang-format before editing. 2019-02-06 11:50:05 +01:00
David Given 02779325ab Move the standard ret boilerplate into a helper procedure, to save a little 
space.
 2019-02-06 08:08:11 +01:00
David Given ed91ea4371 When parsing constants which don't fit into an arith, handle overflow properly 
(and don't turn them all into INT_MAX...).
 2018-09-22 12:45:59 +02:00
David Given 79e7636537 Teach the code generator about the zero register and how to efficiently access 
the stack.
 2018-09-22 11:49:13 +02:00
David Given 99fcde69dc Take hreg aliases into account when finding evicted registers and performing 
the register shuffle dance.
 2018-09-22 11:19:50 +02:00
David Given bbb708717a Add the OPTIONS clause to the mcgg grammar; add an optional pass which converts 
sequences of PUSHes to a single STACKADJUST followed by STOREs. This should
dramatically improve code on stack-unfriendly architectures like MIPS.
 2018-09-22 11:19:00 +02:00
David Given 985d3dc7d1 Remove some old, hopefully unused PowerPC code. Teach the code generator about 
non-volatile long registers.
 2018-09-20 23:30:38 +02:00
David Given 65a20ce2d6 Fix subtle register corruption bug where aliases weren't taken into account 
when assigning input registers to phis, which could cause the same hreg to be
assigned to two vregs of different types. Also improve tracing.
 2018-09-20 23:24:46 +02:00
David Given cb20856aea A few more minor optimisations. 2018-09-20 00:39:13 +02:00
David Given ac856f3b09 The approach I was taking to csa and csb turns out not to work --- critical 
edge splitting can cause new basic blocks to be added to the graph, but while
the graph itself gets properly rewritten the descriptor tables can't be updated
to take these into account, so they end up pointing at the wrong blocks. This
causes really hard-to-debug problems.

The new approach is to parse the descriptor blocks and then generate a
comparison chain. Brute force, but much easier for the compiler to reason
about.
 2018-09-20 00:12:03 +02:00