Steve Kargl 6d04e1422e cosl(): fix polynomial approximation coefficients for ld128 version ... As mention previously, the minmax polynomial approximation in the kernel for cosl() seem to have a bad set of coefficients. In testing, cosl() in the interval [0.785, pi/4] for 1 million values and pi/4 written to 37 decimal digits. The old version on an aarch64 system gave % tlibm/tlibm_lmath -l -x 0.78 -X 7.85398163397448309615660845819875721e-1L cos Interval tested for cosl: [0.78,0.785398] count: 1000000 xm = 7.80213913234863919029058821396125599e-01L libm = 7.10763080972549562455058499280609083e-01L mpfr = 7.10763080972549562455058499280608983e-01L ULP = 1.04431 The max ULP exceeds 1, which is not good. So, I rinsed off a 10 year code and recomputed coefficients. The new minmax polynomial now yields % tlibm/tlibm_lmath -l -x 0.78 -X 7.85398163397448309615660845819875721e-1L cos Interval tested for cosl: [0.78,0.785398] count: 1000000 xm = 7.82916198746768272588844890973704219e-01L libm = 7.08859615479571058183956453286628396e-01L mpfr = 7.08859615479571058183956453286628469e-01L ULP = 0.75407 which is very good. PR: 218514 MFC after: 1 week		2021-11-02 10:54:10 +02:00
..
aarch64	Save all fpcr/fpsr bits in the AArch64 fenv_t	2021-03-12 17:01:41 +00:00
amd64	libm: Add missing END() directives for amd64 routines	2019-10-23 16:05:52 +00:00
arm	lib: further adoption of SPDX licensing ID tags.	2017-11-26 02:00:33 +00:00
bsdsrc	msun: drop clause 3 from the Berkeley license.	2019-12-27 01:11:26 +00:00
i387	Add CFI start/end proc directives to arm64, i386, and ppc	2020-12-05 00:33:28 +00:00
ld80	[LIBM] implementations of sinpi[fl], cospi[fl], and tanpi[fl]	2021-10-26 02:50:20 +03:00
ld128	cosl(): fix polynomial approximation coefficients for ld128 version	2021-11-02 10:54:10 +02:00
man	[LIBM] implementations of sinpi[fl], cospi[fl], and tanpi[fl]	2021-10-26 02:50:20 +03:00
mips	lib: further adoption of SPDX licensing ID tags.	2017-11-26 02:00:33 +00:00
powerpc	Set default SPE FP environment	2021-05-29 21:53:35 -05:00
riscv	RISC-V: Fix feenableexcept return value	2021-03-25 11:16:20 +00:00
src	sinpi,cospi,tanpi: float.h needed for week reference	2021-10-29 03:15:19 +03:00
tests	Fix failures in libm's lround_test after clang 12 import	2021-06-22 18:38:45 +02:00
x86	Resolve conflicts between macros in fenv.h and ieeefp.h	2018-05-31 20:22:47 +00:00
Makefile	lib/msun: Move the files to appropriate locations in the Makefile	2021-10-27 01:34:12 +03:00
Makefile.depend	Update Makefile.depend files	2019-12-11 17:37:53 +00:00
Symbol.map	[LIBM] implementations of sinpi[fl], cospi[fl], and tanpi[fl]	2021-10-26 02:50:20 +03:00