summaryrefslogtreecommitdiff
path: root/libc/src/math/generic/acosf.cpp
AgeCommit message (Collapse)Author
2025-07-20[libc][math] Refactor acosf implementation to header-only in ↵Muhammad Bassiouni
src/__support/math folder. (#148411) Part of #147386 in preparation for: https://discourse.llvm.org/t/rfc-make-clang-builtin-math-functions-constexpr-with-llvm-libc-to-support-c-23-constexpr-math-functions/86450
2025-04-08[libc][math] Fix signaling NaN handling for math functions. (#133347)wldfngrs
Add tests for signaling NaNs, and fix function behavior for handling signaling NaN input. Fixes https://github.com/llvm/llvm-project/issues/124812
2025-03-11[libc][math] Skip checking for exceptional values when ↵lntue
LIBC_MATH_SKIP_ACCURATE_PASS is set. (#130811)
2024-10-05[libc] remove errno.h includes (#110934)Job Henandez Lara
2024-07-12[libc] Migrate to using LIBC_NAMESPACE_DECL for namespace declaration (#98597)Petr Hosek
This is a part of #97655.
2024-07-12Revert "[libc] Migrate to using LIBC_NAMESPACE_DECL for namespace ↵Mehdi Amini
declaration" (#98593) Reverts llvm/llvm-project#98075 bots are broken
2024-07-11[libc] Migrate to using LIBC_NAMESPACE_DECL for namespace declaration (#98075)Petr Hosek
This is a part of #97655.
2024-06-13[libc][math][c23] Add f16sqrtf C23 math function (#95251)OverMighty
Part of #95250.
2024-03-20[libc][NFC] Move `Sign` type to separate header (#85930)Guillaume Chatelet
2024-01-30[libc][NFC] Rename `FPBits` nan functions (#79998)Guillaume Chatelet
- [libc][NFC] Rename FPBits nan functions - rename build_signaling_nan in signaling_nan - rename build_quiet_nan to quiet_nan
2024-01-23[reland][libc] Remove unnecessary `FPBits` functions and properties (#79128)Guillaume Chatelet
- reland #79113 - Fix aarch64 RISC-V build
2024-01-23Revert "[libc] Remove unnecessary `FPBits` functions and properties" (#79118)Guillaume Chatelet
Reverts llvm/llvm-project#79113 It broke aarch64 build bot machines.
2024-01-23[libc] Remove unnecessary `FPBits` functions and properties (#79113)Guillaume Chatelet
This patch reduces the surface of `FPBits`.
2024-01-18[libc][NFC] Introduce a Sign type for FPBits (#78500)Guillaume Chatelet
Another patch is needed to cover `DyadicFloat` and `NormalFloat` constructors.
2023-09-26[libc] Mass replace enclosing namespace (#67032)Guillaume Chatelet
This is step 4 of https://discourse.llvm.org/t/rfc-customizable-namespace-to-allow-testing-the-libc-when-the-system-libc-is-also-llvms-libc/73079
2023-09-07[libc][math] Fix signed zeros for acosf, acoshf, and atanf in FE_DOWNWARD mode.Tue Ly
Fix signed zeros for acosf, acoshf, and atanf in FE_DOWNWARD mode. Reviewed By: sivachandra Differential Revision: https://reviews.llvm.org/D159476
2023-03-23[libc] Fix some math conversion warningsAlex Brachet
Differential Revision: https://reviews.llvm.org/D146738
2023-03-07[libc][math] Switch math functions to use libc_errno and fix some errno and ↵Tue Ly
floating point exceptions. Switch math functions to use libc_errno and fix some errno and floating point exceptions Reviewed By: sivachandra Differential Revision: https://reviews.llvm.org/D145349
2023-02-24[libc][math] Set floating point exceptions for exp*f, sinhf, and coshf.Tue Ly
Set FE_OVERFLOW and FE_UNDERFLOW for expf, exp2f, exp10f, expm1f, sinhf and coshf. Reviewed By: sivachandra, renyichen Differential Revision: https://reviews.llvm.org/D144340
2023-02-10[libc] Move likely/unlikely to the optimization headerGuillaume Chatelet
2023-02-07[libc][NFC] Move attributes from common to macros folderGuillaume Chatelet
2022-09-09[libc][math] Implement acosf function correctly rounded for all rounding modes.Tue Ly
Implement acosf function correctly rounded for all rounding modes. We perform range reduction as follows: - When `|x| < 2^(-10)`, we use cubic Taylor polynomial: ``` acos(x) = pi/2 - asin(x) ~ pi/2 - x - x^3 / 6. ``` - When `2^(-10) <= |x| <= 0.5`, we use the same approximation that is used for `asinf(x)` when `|x| <= 0.5`: ``` acos(x) = pi/2 - asin(x) ~ pi/2 - x - x^3 * P(x^2). ``` - When `0.5 < x <= 1`, we use the double angle formula: `cos(2y) = 1 - 2 * sin^2 (y)` to reduce to: ``` acos(x) = 2 * asin( sqrt( (1 - x)/2 ) ) ``` - When `-1 <= x < -0.5`, we reduce to the positive case above using the formula: ``` acos(x) = pi - acos(-x) ``` Performance benchmark using perf tool from the CORE-MATH project on Ryzen 1700: ``` $ CORE_MATH_PERF_MODE="rdtsc" ./perf.sh acosf GNU libc version: 2.35 GNU libc release: stable CORE-MATH reciprocal throughput : 28.613 System LIBC reciprocal throughput : 29.204 LIBC reciprocal throughput : 24.271 $ CORE_MATH_PERF_MODE="rdtsc" ./perf.sh asinf --latency GNU libc version: 2.35 GNU libc release: stable CORE-MATH latency : 55.554 System LIBC latency : 76.879 LIBC latency : 62.118 ``` Reviewed By: orex, zimmermann6 Differential Revision: https://reviews.llvm.org/D133550
generated by cgit v1.2.3 (git 2.25.1) at 2026-08-01 09:53:47 +0000