feat!: Remove unstable SIMD optimization

[cm-ayf]

BEGIN_COMMIT_OVERRIDE
feat!: Remove unstable SIMD optimization

• features = "simd" no longer supported

END_COMMIT_OVERRIDE

[codecov]

Codecov Report

❌ Patch coverage is 88.67925% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.38%. Comparing base (506c136) to head (27a4a17).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/vocoder/mlsa.rs	88.67%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #99      +/-   ##
==========================================
+ Coverage   68.43%   70.38%   +1.95%     
==========================================
  Files          39       37       -2     
  Lines        1682     1648      -34     
==========================================
+ Hits         1151     1160       +9     
+ Misses        531      488      -43     

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[cm-ayf]

2つ束ねるのが速そう．3つ束ねても2つに比べてそんなに速くなさそう．

[cm-ayf]

内積部分は頭の2つを落とす処理を書くと今より早くはならない

[cm-ayf]

Apple M2 (Armv8.2, neon)

$ git switch main && cargo bench
test bonsai        ... bench:  20,801,316.70 ns/iter (+/- 767,580.14)
test bonsai_letter ... bench:  57,772,504.10 ns/iter (+/- 8,804,701.66)
test is_bonsai     ... bench:  32,759,020.80 ns/iter (+/- 10,022,525.84)

$ git switch main && cargo bench --features simd
test bonsai        ... bench:  12,272,745.80 ns/iter (+/- 120,040.41)
test bonsai_letter ... bench:  34,358,054.20 ns/iter (+/- 1,386,455.95)
test is_bonsai     ... bench:  19,133,387.60 ns/iter (+/- 497,455.00)

$ git switch no-unstable && cargo bench
test bonsai        ... bench:  12,446,670.80 ns/iter (+/- 157,435.87)
test bonsai_letter ... bench:  34,897,683.40 ns/iter (+/- 2,214,201.69)
test is_bonsai     ... bench:  19,242,979.10 ns/iter (+/- 355,269.45)

[phenylshima]

stable-x86_64-unknown-linux-gnu updated - rustc 1.88.0 (6b00bc388 2025-06-23) (from rustc 1.87.0 (17067e9ac 2025-05-09))
nightly-x86_64-unknown-linux-gnu updated - rustc 1.91.0-nightly (a65b04d7c 2025-08-02) (from rustc 1.89.0-nightly (8da623945 2025-06-13))

13th Gen Intel(R) Core(TM) i5-13500

git switch main && cargo bench
running 3 tests
test bonsai        ... bench:  16,458,765.50 ns/iter (+/- 289,340.27)
test bonsai_letter ... bench:  45,985,171.70 ns/iter (+/- 739,176.13)
test is_bonsai     ... bench:  25,486,801.60 ns/iter (+/- 120,151.92)

git switch main && RUSTFLAGS="-C target-cpu=native" cargo bench
running 3 tests
test bonsai        ... bench:  16,696,739.30 ns/iter (+/- 207,341.57)
test bonsai_letter ... bench:  46,323,621.80 ns/iter (+/- 446,965.36)
test is_bonsai     ... bench:  25,741,033.90 ns/iter (+/- 195,608.35)

git switch main && RUSTFLAGS="-C target-cpu=native" cargo bench --features simd
running 3 tests
test bonsai        ... bench:  13,735,444.50 ns/iter (+/- 22,087.25)
test bonsai_letter ... bench:  38,573,699.00 ns/iter (+/- 148,233.77)
test is_bonsai     ... bench:  21,297,797.50 ns/iter (+/- 107,323.24)

git switch no-unstable && cargo bench
running 3 tests
test bonsai        ... bench:  10,389,875.40 ns/iter (+/- 95,233.56)
test bonsai_letter ... bench:  29,519,937.60 ns/iter (+/- 908,927.55)
test is_bonsai     ... bench:  16,506,458.20 ns/iter (+/- 119,624.46)

git switch no-unstable && RUSTFLAGS="-C target-cpu=native" cargo bench
running 3 tests
test bonsai        ... bench:  17,106,528.40 ns/iter (+/- 139,770.32)
test bonsai_letter ... bench:  47,455,016.20 ns/iter (+/- 297,228.28)
test is_bonsai     ... bench:  26,435,560.50 ns/iter (+/- 196,284.83)