MarcusandClaude Opus 5.5 5377db48fd fix(shader): round the v_mad_legacy_f32 product before the add ...

VOP3 0x140 is v_mad_legacy_f32 on gfx10.1. Measured on gfx1010 (RX 5700
XT) in wave32 and wave64, IEEE 0 and 1 and f32 denormal modes 0 to 3, it
rounds the product before the add, flushes f32 denormal sources, product
and result in every mode, and gives a +0 product for a zero factor.

The translation multiplies, applies the zero rule and flushTinyProduct,
adds, and keeps the nanResultF32 wrapper. f32DenormalFlushFor returns 3
for the instruction before reading FLOAT_MODE. A sum of two zeros takes
its sign on the bits, as lavapipe returned -0 for +0 + -0. The execution
test pins the measured results and compares NaN bits exactly. RDNA2
(gfx1031), where the encoding is v_fma_legacy_f32 and fused, is noted in
TechnicalDebt.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

2026-10-10 08:18:55 +02:00

..

ARCHITECTURE.md

docs(architecture): keep the recompiler stage notes under their diagram

2026-10-10 03:16:29 +02:00

BUILD.md

Merge pull request #1686 from Cloud-Multiplayer/feat/macos-write-watch

2026-10-10 08:03:40 +02:00

CONVENTIONS.md

refactor(docs): separated user and dev in docs + compatibility file

2026-09-28 22:58:17 +03:00

HW_ORACLE.md

feat(hw-oracle): make the group segment size an option

2026-10-09 12:47:59 -03:00

PROGRESS.md

fix(progress): exclude library test fixtures from function counts

2026-10-08 17:30:43 +05:30

TechnicalDebt.md

fix(shader): round the v_mad_legacy_f32 product before the add

2026-10-10 08:18:55 +02:00