| commit | 9af8dca70fce1538675a857e3a053f6d35b18aea | |
| author | Tue Ly <lntue.h@gmail.com> | |
| Thu, 6 Apr 2023 13:26:16 +0000 (6 09:26 -0400) | ||
| committer | Tue Ly <lntue@google.com> | |
| Fri, 7 Apr 2023 14:31:46 +0000 (7 10:31 -0400) | ||
| tree | e376fb085d25dff9b2129335d73383747971db63 | treesnapshot (tar.gz zip) |
| parent | 3f4d16018d51c9deff8e7deb01cefcf52e966cd3 | commitdiff |
[libc][math] Update range reduction step for log10f and reduce its latency.
Simplify the range reduction steps by choosing the reduction constants
carefully so that the reduced arguments v = r*m_x - 1 and v^2 are exact in double
precision, even without FMA instructions, and -2^-8 <= v < 2^-7. This allows the
polynomial evaluations to be parallelized more efficiently.
Reviewed By: zimmermann6
Differential Revision: https://reviews.llvm.org/D147676
Simplify the range reduction steps by choosing the reduction constants
carefully so that the reduced arguments v = r*m_x - 1 and v^2 are exact in double
precision, even without FMA instructions, and -2^-8 <= v < 2^-7. This allows the
polynomial evaluations to be parallelized more efficiently.
Reviewed By: zimmermann6
Differential Revision: https://reviews.llvm.org/D147676