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2025-08-11[libc][math] Refactor cosf implementation to header-only in ↵Muhammad Bassiouni
src/__support/math folder. (#152069) 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)
2025-03-11[libc] Provide more fine-grained control of FMA instruction for ARM targets. ↵lntue
(#130700)
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.
2024-03-20[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
2023-03-23[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
2023-02-09[libc][NFC] Move cpu_features.h to properties subfolderGuillaume Chatelet
2023-02-07[libc][NFC] Rename macrosGuillaume Chatelet
2023-02-07[libc][NFC] Move attributes from common to macros folderGuillaume Chatelet
2023-02-07[libc][NFC] Move cpu_features to macros folderGuillaume Chatelet
2023-01-25[libc][NFC] Detect host CPU features using try_compile instead of try_run.Guillaume Chatelet
This implements the same behavior as D141997 but makes sure that the same detection mechanism is used between CMake and source code. Reviewed By: sivachandra, lntue Differential Revision: https://reviews.llvm.org/D142108
2023-01-24Revert D142108 "[reland][libc][NFC] Detect host CPU features using ↵Guillaume Chatelet
try_compile instead of try_run." The build bots are failing. This reverts commit c84d74f5bfe810744de1268eb0516a6622e4aa73.
2023-01-24[reland][libc][NFC] Detect host CPU features using try_compile instead of ↵Guillaume Chatelet
try_run. This implements the same behavior as D141997 but makes sure that the same detection mechanism is used between CMake and source code. Differential Revision: https://reviews.llvm.org/D142108
2023-01-23Revert D142108 "[libc][NFC] Detect host CPU features using try_compile ↵Guillaume Chatelet
instead of try_run." Build bots are failing. https://lab.llvm.org/buildbot/#/builders/90/builds/44634 This reverts commit 9acc2f37bdfce08ca0c2faec03392db10d1bb7a9.
2023-01-23[libc][NFC] Detect host CPU features using try_compile instead of try_run.Guillaume Chatelet
This implements the same behavior as D141997 but makes sure that the same detection mechanism is used between CMake and source code. Differential Revision: https://reviews.llvm.org/D142108
2022-09-01[libc][NFC] Use cpp::optional for checking exceptional values of math functions.Tue Ly
Update the utility functions for checking exceptional values of math functions to use cpp::optional return values. Reviewed By: sivachandra Differential Revision: https://reviews.llvm.org/D133134
2022-08-11[libc] Change sinf/cosf range reduction to mod pi/32 to be shared with tanf.Tue Ly
Change sinf/cosf range reduction to mod pi/32 to be shared with tanf, since polynomial approximations for tanf on subintervals of length pi/16 do not provide enough accuracy. Reviewed By: orex Differential Revision: https://reviews.llvm.org/D131652
2022-08-05[libc] Implement sincosf function correctly rounded to all rounding modes.Tue Ly
Refactor common range reductions and evaluations for sinf, cosf, and sincosf. Added exhaustive tests for sincosf. Performance before the patch: ``` System LIBC reciprocal throughput : 30.205 LIBC reciprocal throughput : 30.533 System LIBC latency : 67.961 LIBC latency : 61.564 ``` Performance after the patch: ``` System LIBC reciprocal throughput : 30.409 LIBC reciprocal throughput : 20.273 System LIBC latency : 67.527 LIBC latency : 61.959 ``` Reviewed By: orex Differential Revision: https://reviews.llvm.org/D130901
2022-07-29[libc] Implement cosf function that is correctly rounded to all rounding modes.Tue Ly
Implement cosf function that is correctly rounded to all rounding modes. Performance benchmark using perf tool from CORE-MATH project (https://gitlab.inria.fr/core-math/core-math/-/tree/master) on Ryzen 1700: Before this patch (not correctly rounded): ``` $ CORE_MATH_PERF_MODE="rdtsc" ./perf.sh cosf CORE-MATH reciprocal throughput : 19.043 System LIBC reciprocal throughput : 26.328 LIBC reciprocal throughput : 30.955 $ CORE_MATH_PERF_MODE="rdtsc" ./perf.sh cosf --latency GNU libc version: 2.31 GNU libc release: stable CORE-MATH latency : 49.995 System LIBC latency : 59.286 LIBC latency : 60.174 ``` After this patch (correctly rounded): ``` $ CORE_MATH_PERF_MODE="rdtsc" ./perf.sh cosf GNU libc version: 2.31 GNU libc release: stable CORE-MATH reciprocal throughput : 19.072 System LIBC reciprocal throughput : 26.286 LIBC reciprocal throughput : 13.631 $ CORE_MATH_PERF_MODE="rdtsc" ./perf.sh cosf --latency GNU libc version: 2.31 GNU libc release: stable CORE-MATH latency : 49.872 System LIBC latency : 59.468 LIBC latency : 56.119 ``` Reviewed By: orex, zimmermann6 Differential Revision: https://reviews.llvm.org/D130644
2022-01-19[libc] Add a naming rule for global constants.Siva Chandra Reddy
Reviewed By: michaelrj Differential Revision: https://reviews.llvm.org/D117645
2021-12-07[libc] apply new lint rulesMichael Jones
This patch applies the lint rules described in the previous patch. There was also a significant amount of effort put into manually fixing things, since all of the templated functions, or structs defined in /spec, were not updated and had to be handled manually. Reviewed By: sivachandra, lntue Differential Revision: https://reviews.llvm.org/D114302
2021-02-03[libc][NFC] Move generic math implementations to the generic directory.Siva Chandra
This expands the pattern suggest in https://reviews.llvm.org/D95850 to all math functions.
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