Valiantsin DzerakhandClaude Opus 5.5 2fe6a6d4c1 Keep MXCSR in line with FPCR where FPCR changes instead of checking it in every FP op ...

The FP helpers compared c->fpcr with a cached copy before every operation to resync MXCSR lazily. MXCSR now
follows FPCR.FZ at once: MSR FPCR calls rt_fpcr_sync, and so do rt_call (thread, fiber and host entry into guest
code), fiber resume (FIBER_FLAG_FLOAT_SWITCH fibers keep their own MXCSR) and the differential test harness per
case. op and vop only test FPCR.RMode for the slow path, and their redo check is one ordered-not-equal compare of
|r| with the smallest normal, the same NaN-or-smallest-normal set as before.

Hot guest code shrinks by about a quarter (132 functions holding half the guest cycles, 1.4.3); fight frame time
moves 1-3%, inside the run-to-run spread. lift, simd, func, atomic and flags_check pass on 1.4.3; simd.py fails
without the harness sync.

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

2026-10-28 12:25:25 +03:00

..

atomic.py

Add the recompiler, Windows runtime, tools and docs

2026-10-23 22:27:54 +03:00

common.py

Keep NZCV in a local of each generated function instead of c->nzcv

2026-10-27 18:07:58 +03:00

func.py

Keep NZCV in a local of each generated function instead of c->nzcv

2026-10-27 18:07:58 +03:00

harness.c

Keep MXCSR in line with FPCR where FPCR changes instead of checking it in every FP op

2026-10-28 12:25:25 +03:00

lift.py

Add the recompiler, Windows runtime, tools and docs

2026-10-23 22:27:54 +03:00

simd.py

Add the recompiler, Windows runtime, tools and docs

2026-10-23 22:27:54 +03:00