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Floats as written, never fused; fma and muladd; f32/f64 bits, f16 and bf16

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- a * b + c is two roundings on every processor and --cpu: the IR has no fast-math flags, and clang
  compiles it with -ffp-contract=on (checked in the assembly: never fused, also with FMA hardware)
- fma(a, b, c) / v.fma(b, c): one rounding, always (llvm.fma)
- muladd(a, b, c) / v.muladd(b, c): the fastest way here (llvm.fmuladd), what v.fma was before
- f32_bits / f32_from_bits / f64_bits / f64_from_bits: bitcasts, also of vectors
- f16_to_f32 / f32_to_f16 (LLVM half), bf16_to_f32 / f32_to_bf16 (integer ops, ties to even, NaN kept)
- docs (en, pl): what is guaranteed about floats, the new built-ins

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Psc42moPLwP43Cmb9oZqSR
This commit is contained in:
Claude 2026-11-01 15:25:40 +00:00
commit 0ceaaa27c4
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13 changed files with 373 additions and 22 deletions
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13
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@ -0,0 +1,13 @@
0 5.551115123125783e-17
1.4901161e-08 10
3.25 f32x4(3.25, 3.25, 3.25, 3.25) 1.4901161e-08
0
1065353216 4607182418800017408 2147483648
3.1415927 2.5 -1
inf u32x4(1065353216, 1073741824, 3221225472, 1056964608)
1 -2 65504 5.9604645e-08
11878 31743 31744 0.3330078
f32x8(1, 2, 3, 4, 0, -0, 0.5, 0.25)
1 3.140625 16457
16256 16258 32704
u16x4(16256, 49152, 16128, 16457) f32x4(1, -2, 0.5, 3.140625)