CHEN Feng 34b4faee7c Run the game on x86-64-v2 CPUs without AVX2 ...

-march=x86-64-v3 kept the port and the installer to CPUs with AVX2 and FMA. --cpu v2 compiles the generated code and the runtime for SSE4.2 instead. Without FMA3 the FP lowering calls fma/fmaf, so runtime/fma.c provides correctly rounded ones (musl, MIT) that honour MXCSR's rounding mode, FTZ and DAZ; the UCRT's software fallback rounds incorrectly by up to half an ulp. simd.h's fast paths keep their assumptions.

The installer's host check asks for x86-64-v2 and selects libtotkrt.a or libtotkrt-v2.a; both release scripts build and ship the pair. The differential tests compile fma.c as well, so a --cflags=-march=x86-64-v2 run tests it.

Tested on an i7-3770K (no AVX2, FMA or BMI) with an RTX 3060 Ti, game 1.4.3: the installer ran end to end, --selftest passed and play holds 40-60 fps at 1080p. fma and fmaf matched 152,288 exact vectors over two seeds, including ties, subnormals and every rounding mode, FTZ and DAZ combination. The v3 build is unchanged: fma.c is an empty translation unit there.

2026-11-01 07:09:13 +08:00

..

atomic.py

Add the recompiler, Windows runtime, tools and docs

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

common.py

Run the game on x86-64-v2 CPUs without AVX2

2026-11-01 07:09:13 +08:00

func.py

Run the game on x86-64-v2 CPUs without AVX2

2026-11-01 07:09:13 +08:00

harness.c

Merge the spin wait gates: they also end the fight hangs

2026-10-28 20:05:44 +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