llvm-project

Commit Graph

Author	SHA1	Message	Date
Tue Ly	4e5f8b4d8d	[libc] Add implementation of expm1f. Use expm1f(x) = exp(x) - 1 for \|x\| > ln(2). For \|x\| <= ln(2), divide it into 3 subintervals: [-ln2, -1/8], [-1/8, 1/8], [1/8, ln2] and use a degree-6 polynomial approximation generated by Sollya's fpminmax for each interval. Errors < 1.5 ULPs when we use fma to evaluate the polynomials. Differential Revision: https://reviews.llvm.org/D101134	2021-06-10 14:58:34 -04:00
Siva Chandra	95934c3a37	[libc] Add hardware implementations of fma and fmaf for x86_64 and aarch64. The current generic implementation of the fmaf function has been moved to the FPUtil directory. This allows one use the fma operation from implementations of other math functions like the trignometric functions without depending on/requiring the fma/fmaf/fmal function targets. If this pattern ends being convenient, we will switch all generic math implementations to this pattern. Reviewed By: lntue Differential Revision: https://reviews.llvm.org/D100811	2021-04-21 04:31:27 +00:00

Author

SHA1

Message

Date

Tue Ly

4e5f8b4d8d

[libc] Add implementation of expm1f.

Use expm1f(x) = exp(x) - 1 for |x| > ln(2).
For |x| <= ln(2), divide it into 3 subintervals: [-ln2, -1/8], [-1/8, 1/8], [1/8, ln2]
and use a degree-6 polynomial approximation generated by Sollya's fpminmax for each interval.
Errors < 1.5 ULPs when we use fma to evaluate the polynomials.

Differential Revision: https://reviews.llvm.org/D101134

2021-06-10 14:58:34 -04:00

Siva Chandra

95934c3a37

[libc] Add hardware implementations of fma and fmaf for x86_64 and aarch64.

The current generic implementation of the fmaf function has been moved
to the FPUtil directory. This allows one use the fma operation from
implementations of other math functions like the trignometric functions
without depending on/requiring the fma/fmaf/fmal function targets. If
this pattern ends being convenient, we will switch all generic math
implementations to this pattern.

Reviewed By: lntue

Differential Revision: https://reviews.llvm.org/D100811

2021-04-21 04:31:27 +00:00

2 Commits