| commit | b416f28fb276431ab60557e595fca8751d65399a | [log] [tgz] |
|---|---|---|
| author | lntue <35648136+lntue@fuchsia.infra.roller.users.noreply.github.com> | Tue Nov 07 01:33:58 2023 +0000 |
| committer | Copybara-Service <copybara-worker@google.com> | Mon Nov 06 17:36:17 2023 -0800 |
| tree | 7e1c47c3f6d877272332322ba9b57f16753a9cf8 | |
| parent | ef33a790c2df1cc7a18e1070107368ca036bfc39 [diff] |
[roll] Roll llvm-project/libc [libc][math] Implement powf function correctly rounded to all rounding modes. (#71188) We compute `pow(x, y)` using the formula ``` pow(x, y) = x^y = 2^(y * log2(x)) ``` We follow similar steps as in `log2f(x)` and `exp2f(x)`, by breaking down into `hi + mid + lo` parts, in which `hi` parts are computed using the exponent field directly, `mid` parts will use look-up tables, and `lo` parts are approximated by polynomials. We add some speedup for common use-cases: ``` pow(2, y) = exp2(y) pow(10, y) = exp10(y) pow(x, 2) = x * x pow(x, 1/2) = sqrt(x) pow(x, -1/2) = rsqrt(x) - to be added ``` GitOrigin-RevId: a8ab5682e0806b034ec59afafa79ea1358a54c81 Original-Revision: bfcf18edd8508218e352268d47beb679fc03deab Change-Id: Ie8d198f3a1edf5e1cefa52a3a172ceab3ea3d4e2
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