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5c22fd25c1
glibc/sysdeps/mips
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Adhemerval Zanella 5c22fd25c1 math: Use exp2m1f from CORE-MATH 
The CORE-MATH implementation is correctly rounded (for any rounding mode)
and shows better performance compared to the generic exp2m1f.

The code was adapted to glibc style and to use the definition of
math_config.h (to handle errno, overflow, and underflow).  The
only change is to handle FLT_MAX_EXP for FE_DOWNWARD or FE_TOWARDZERO.

The benchmark inputs are based on exp2f ones.

Benchtest on x64_64 (Ryzen 9 5900X, gcc 14.2.1), aarch64 (Neoverse-N1,
gcc 13.3.1), and powerpc (POWER10, gcc 13.2.1):

Latency                      master        patched   improvement
x86_64                      40.6042        48.7104       -19.96%
x86_64v2                    40.7506        35.9032        11.90%
x86_64v3                    35.2301        31.7956        9.75%
i686                        102.094        94.6657        7.28%
aarch64                     18.2704        15.1387        17.14%
power10                     11.9444         8.2402        31.01%

reciprocal-throughput        master        patched   improvement
x86_64                      20.8683        16.1428        22.64%
x86_64v2                    19.5076        10.4474        46.44%
x86_64v3                    19.2106        10.4014        45.86%
i686                        56.4054        59.3004        -5.13%
aarch64                     12.0781         7.3953        38.77%
power10                      6.5306         5.9388         9.06%

The generic implementation calls __ieee754_exp2f and x86_64 provides
an optimized ifunc version (built with -mfma -mavx2, not correctly
rounded).  This explains the performance difference for x86_64.

Same for i686, where the ABI provides an optimized __ieee754_exp2f
version built with '-msse2 -mfpmath=sse'.  When built wth same
flags, the new algorithm shows a better performance:

                            master        patched    improvement
latency                    102.094        91.2823         10.59%
reciprocal-throughput      56.4054        52.7984          6.39%

Signed-off-by: Alexei Sibidanov <sibid@uvic.ca>
Signed-off-by: Paul Zimmermann <Paul.Zimmermann@inria.fr>
Signed-off-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Reviewed-by: DJ Delorie <dj@redhat.com>
2024-11-01 11:27:35 -03:00
..
bits login: structs utmp, utmpx, lastlog _TIME_BITS independence (bug 30701) 2024-04-19 14:38:17 +02:00
fpu MIPSr6/math: Use builtin fma and fmaf 2024-07-01 14:52:30 -03:00
ieee754 Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
include/sys Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
mips32 math: Use exp2m1f from CORE-MATH 2024-11-01 11:27:35 -03:00
mips64 math: Use exp2m1f from CORE-MATH 2024-11-01 11:27:35 -03:00
nofpu Do not define various fenv.h macros for MIPS soft-float (bug 23479). 2018-08-02 15:53:29 +00:00
nptl Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
sys Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
__longjmp.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
abort-instr.h Move mips from ports to libc. 2014-02-10 23:30:21 +00:00
add_n.S Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
addmul_1.S Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
atomic-machine.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
bsd-_setjmp.S Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
bsd-setjmp.S Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
configure Convert to autoconf 2.72 (vanilla release, no distribution patches) 2024-06-17 21:15:28 +02:00
configure.ac elf: Replace PI_STATIC_AND_HIDDEN with opposite HIDDEN_VAR_NEEDS_DYNAMIC_RELOC 2022-04-26 09:26:22 -07:00
dl-debug.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
dl-dtprocnum.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
dl-machine-reject-phdr.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
dl-machine-rel.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
dl-machine.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
dl-procinfo.c elf: Remove platform strings in dl-procinfo.c 2024-06-18 10:45:36 +02:00
dl-procinfo.h elf: Remove HWCAP_IMPORTANT 2024-06-18 10:45:36 +02:00
dl-r_debug.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
dl-relocate-ld.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
dl-tls.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
dl-trampoline.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
elf_machine_sym_no_match.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
elf-initfini.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
fpregdef.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
fpu_control.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
gccframe.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
Implies Move mips from ports to libc. 2014-02-10 23:30:21 +00:00
jmpbuf-unwind.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
ldbl-classify-compat.h Move LDBL_CLASSIFY_COMPAT to its own header. 2018-02-01 21:01:00 +00:00
ldsodefs.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
libc-tls.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
linkmap.h MIPS support for GNU hash 2019-08-29 20:11:42 +00:00
localplt.data Add localplt.data for MIPS. 2016-11-04 16:40:54 +00:00
lshift.S Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
machine-gmon.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
Makefile tests: XFAIL audit tests failing on all mips configurations, bug 29404 2024-07-12 18:49:42 +02:00
math-tests-snan-payload.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
math-use-builtins-ffs.h mips: Use builtins for ffs and ffsll 2024-02-14 12:20:49 -03:00
memcpy.S Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
memset.S Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
mul_1.S Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
nan-high-order-bit.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
preconfigure configure: Use autoconf 2.71 2023-07-17 10:08:10 -04:00
preconfigure.ac MIPS: Use an autoconf template to produce `preconfigure' 2022-05-13 17:07:23 +01:00
regdef.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
rshift.S Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
setjmp_aux.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
setjmp.S Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
sgidefs.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
sotruss-lib.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
stackinfo.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
start.S Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
strcmp.S Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
sub_n.S Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
submul_1.S Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tininess.h Move mips from ports to libc. 2014-02-10 23:30:21 +00:00
tst-abi-fp32mod.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst-abi-fp64amod.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst-abi-fp64mod.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst-abi-fpxxmod.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst-abi-fpxxomod.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst-abi-interlink.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst-audit.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst-mode-switch-1.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst-mode-switch-2.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst-mode-switch-3.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst-undefined-weak-lib.S Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst-undefined-weak.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
unwind-arch.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
utmp-size.h login: Check default sizes of structs utmp, utmpx, lastlog 2024-04-19 14:38:17 +02:00