mirror of
https://github.com/RetroPortingToolKit/psxrecomp
synced 2026-10-25 18:05:12 -04:00
Alexandros Mandravillis
67e9b4cf42
When straight-line interpretation reaches a clean page, the interpreter hands the PC back to static dispatch. If that PC is game text whose live bytes differ from the boot EXE, dispatch refuses the compiled code and enters the interpreter again, which hands back one instruction later. A page of such text cost about a thousand dispatch round trips. This happens during the retail BIOS intro on profiles whose shell runs interpreted in RAM (the SCPH5552 profile has no shell seeds). In a game whose boot EXE later owns that RAM, every shell instruction took the round trip; on one PAL title the intro ran at 17 fields/s on the host instead of 42. Straight-line flow now keeps interpreting while the next PC is game text that psx_game_text_native_ok() refuses, and re-tests every instruction, so it hands back at the first PC dispatch accepts. interp_refused_game_text links the production interpreter into a fixture: from a dirty page into refused text, it hands back once and dispatch runs the compiled code at the first accepted page. Before this change the interpreter returned at the first clean page. A control checks that a clean page outside game text is still handed back at once.
24 lines
945 B
Python
24 lines
945 B
Python
"""Straight-line interpretation does not hand refused game text back.
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Links the production dirty_ram_interp.c (release build, game dispatch on) into
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test_interp_refused_game_text.c at -O0 and -O2; every other runtime seam is an
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abort() stub (fixture_link.py).
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"""
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import argparse
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import tempfile
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from pathlib import Path
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from fixture_link import build_and_run
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if __name__ == '__main__':
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parser = argparse.ArgumentParser()
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parser.add_argument('--cc', default='gcc')
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args = parser.parse_args()
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here = Path(__file__).resolve().parent
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with tempfile.TemporaryDirectory() as root:
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for opt in ('-O0', '-O2'):
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build_and_run(args.cc, here, here.parent, opt, Path(root),
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['dirty_ram_interp.c'], 'test_interp_refused_game_text.c',
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defines=('PSX_HAS_GAME_DISPATCH', 'PSX_NO_DEBUG_TOOLS'))
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print('PASS: interpretation runs through refused game text (O0/O2)')
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