i860 emu: pipelined pftrunc/pfix through the adder pipe (raw-bits pipe entries)

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The frame-1 extent bug traced to four `pftrunc.sd fN,f0,fX` ops (P=1)
converting the region bounds through the A-pipe -- our fix/ftrunc was
scalar-only (MAME's core never implemented the pipelined form: "pipelined
not functional yet"). The drains then retired neighboring values (the
homogeneous w=1.0f as raw bits -> y1=0x3F800000>>7=8323072 -> ~8.3M phantom
tile rows = the 49K uniform bins / 4096 same-page descriptors).

Pipe stages now carry (value, rp, raw): pipelined ftrunc/fix push the
truncated integer BITS (64-bit pair for .sd results), and _retire() writes
raw entries back verbatim instead of re-encoding floats. Extent probe after
fix: x0=y0=x1=y1=0 (sane empty bound), single visit instead of a hot loop.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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This commit is contained in:

Cyd

2026-07-15 17:53:59 -05:00

co-authored by Claude Opus 4.8

parent 6991b68685

commit 051544fed6

1 changed files with 734 additions and 708 deletions

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emulator/firmware-decomp/emu860.py

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