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c3d466cba1
glibc/sysdeps/ieee754/dbl-64
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Wilco Dijkstra c3d466cba1 Remove slow paths from pow 
Remove the slow paths from pow.  Like several other double precision math
functions, pow is exactly rounded.  This is not required from math functions
and causes major overheads as it requires multiple fallbacks using higher
precision arithmetic if a result is close to 0.5ULP.  Ridiculous slowdowns
of up to 100000x have been reported when the highest precision path triggers.

All GLIBC math tests pass on AArch64 and x64 (with ULP of pow set to 1).
The worst case error is ~0.506ULP.  A simple test over a few hundred million
values shows pow is 10% faster on average.  This fixes BZ #13932.

	[BZ #13932]
	* sysdeps/ieee754/dbl-64/uexp.h (err_1): Remove.
	* benchtests/pow-inputs: Update comment for slow path cases.
	* manual/probes.texi (slowpow_p10): Delete removed probe.
	(slowpow_p10): Likewise.
	* math/Makefile: Remove halfulp.c and slowpow.c.
	* sysdeps/aarch64/libm-test-ulps: Set ULP of pow to 1.
	* sysdeps/generic/math_private.h (__exp1): Remove error argument.
	(__halfulp): Remove.
	(__slowpow): Remove.
	* sysdeps/i386/fpu/halfulp.c: Delete file.
	* sysdeps/i386/fpu/slowpow.c: Likewise.
	* sysdeps/ia64/fpu/halfulp.c: Likewise.
	* sysdeps/ia64/fpu/slowpow.c: Likewise.
	* sysdeps/ieee754/dbl-64/e_exp.c (__exp1): Remove error argument,
	improve comments and add error analysis.
	* sysdeps/ieee754/dbl-64/e_pow.c (__ieee754_pow): Add error analysis.
	(power1): Remove function:
	(log1): Remove error argument, add error analysis.
	(my_log2): Remove function.
	* sysdeps/ieee754/dbl-64/halfulp.c: Delete file.
	* sysdeps/ieee754/dbl-64/slowpow.c: Likewise.
	* sysdeps/m68k/m680x0/fpu/halfulp.c: Likewise.
	* sysdeps/m68k/m680x0/fpu/slowpow.c: Likewise.
	* sysdeps/powerpc/power4/fpu/Makefile: Remove CPPFLAGS-slowpow.c.
	* sysdeps/x86_64/fpu/libm-test-ulps: Set ULP of pow to 1.
	* sysdeps/x86_64/fpu/multiarch/Makefile: Remove slowpow-fma.c,
	slowpow-fma4.c, halfulp-fma.c, halfulp-fma4.c.
	* sysdeps/x86_64/fpu/multiarch/e_pow-fma.c (__slowpow): Remove define.
	* sysdeps/x86_64/fpu/multiarch/e_pow-fma4.c (__slowpow): Likewise.
	* sysdeps/x86_64/fpu/multiarch/halfulp-fma.c: Delete file.
	* sysdeps/x86_64/fpu/multiarch/halfulp-fma4.c: Likewise.
	* sysdeps/x86_64/fpu/multiarch/slowpow-fma.c: Likewise.
	* sysdeps/x86_64/fpu/multiarch/slowpow-fma4.c: Likewise.
2018-02-12 10:47:09 +00:00
..
wordsize-64 Move LDBL_CLASSIFY_COMPAT to its own header. 2018-02-01 21:01:00 +00:00
asincos.tbl Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
atnat2.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
atnat.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
branred.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
branred.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
dbl2mpn.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
dla.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
doasin.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
doasin.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
dosincos.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
dosincos.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
e_acos.c
e_acosh.c Consistently use uintN_t not u_intN_t in libm. 2017-08-03 19:55:04 +00:00
e_asin.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
e_atan2.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
e_atanh.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
e_cosh.c Consistently use uintN_t not u_intN_t in libm. 2017-08-03 19:55:04 +00:00
e_exp2.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
e_exp10.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
e_exp.c Remove slow paths from pow 2018-02-12 10:47:09 +00:00
e_fmod.c Consistently use uintN_t not u_intN_t in libm. 2017-08-03 19:55:04 +00:00
e_gamma_r.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
e_hypot.c Consistently use uintN_t not u_intN_t in libm. 2017-08-03 19:55:04 +00:00
e_ilogb.c
e_j0.c Fix y0 and y1 exception handling for zero input [BZ #21134] 2017-02-15 10:30:59 -02:00
e_j1.c Fix y0 and y1 exception handling for zero input [BZ #21134] 2017-02-15 10:30:59 -02:00
e_jn.c [BZ #22244] Fix yn(n,0) without SVID wrapper 2017-10-04 10:15:12 +01:00
e_lgamma_r.c Use fabs(f/l) rather than __fabs 2017-09-29 18:54:24 +01:00
e_log2.c Use fabs(f/l) rather than __fabs 2017-09-29 18:54:24 +01:00
e_log10.c Use fabs(f/l) rather than __fabs 2017-09-29 18:54:24 +01:00
e_log.c Remove slow paths from log 2018-02-07 12:24:43 +00:00
e_pow.c Remove slow paths from pow 2018-02-12 10:47:09 +00:00
e_rem_pio2.c Consistently use uintN_t not u_intN_t in libm. 2017-08-03 19:55:04 +00:00
e_remainder.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
e_sinh.c Consistently use uintN_t not u_intN_t in libm. 2017-08-03 19:55:04 +00:00
e_sqrt.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
gamma_product.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
gamma_productf.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
k_cos.c
k_rem_pio2.c Narrowing the visibility of libc-internal.h even further. 2017-03-01 20:33:46 -05:00
k_sin.c
k_tan.c
lgamma_neg.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
lgamma_product.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
Makefile Fix CFLAGS override in sysdeps/ieee754/dbl-64 2017-08-24 15:56:11 +01:00
MathLib.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
mpa-arch.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
mpa.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
mpa.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
mpatan2.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
mpatan.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
mpatan.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
mpexp.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
mplog.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
mpn2dbl.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
mpsqrt.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
mpsqrt.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
mptan.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
mydefs.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
powtwo.tbl Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
root.tbl Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_asinh.c Use libm_alias_double for some dbl-64 functions. 2017-09-29 23:54:33 +00:00
s_atan.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_cbrt.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_ceil.c Use libm_alias_double for more dbl-64 functions. 2017-10-03 17:47:35 +00:00
s_copysign.c Use libm_alias_double for some dbl-64 functions. 2017-09-29 23:54:33 +00:00
s_cos.c
s_erf.c Use libm_alias_double for some dbl-64 functions. 2017-09-29 23:54:33 +00:00
s_expm1.c Use libm_alias_double for some dbl-64 functions. 2017-09-29 23:54:33 +00:00
s_f32xaddf64.c Add narrowing add functions. 2018-02-10 02:08:43 +00:00
s_fabs.c Use libm_alias_double for some dbl-64 functions. 2017-09-29 23:54:33 +00:00
s_fadd.c Add narrowing add functions. 2018-02-10 02:08:43 +00:00
s_finite.c Move LDBL_CLASSIFY_COMPAT to its own header. 2018-02-01 21:01:00 +00:00
s_floor.c Use libm_alias_double for more dbl-64 functions. 2017-10-03 17:47:35 +00:00
s_fma.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_fmaf.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_fpclassify.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_frexp.c Use libm_alias_double for dbl-64 frexp. 2017-10-03 20:56:46 +00:00
s_fromfp_main.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_fromfp.c Use libm_alias_double for some dbl-64 functions. 2017-09-29 23:54:33 +00:00
s_fromfpx.c Use libm_alias_double for some dbl-64 functions. 2017-09-29 23:54:33 +00:00
s_getpayload.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_isinf.c Move LDBL_CLASSIFY_COMPAT to its own header. 2018-02-01 21:01:00 +00:00
s_isnan.c Move LDBL_CLASSIFY_COMPAT to its own header. 2018-02-01 21:01:00 +00:00
s_issignaling.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_llrint.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_llround.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_log1p.c Fix -Os log1p, log1pf build (bug 21314). 2018-02-01 20:40:48 +00:00
s_logb.c Use libm_alias_double for dbl-64 logb. 2017-10-03 23:44:41 +00:00
s_lrint.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_lround.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_modf.c Use libm_alias_double for dbl-64 modf. 2017-10-03 23:46:23 +00:00
s_nearbyint.c Use libm_alias_double for more dbl-64 functions. 2017-10-03 17:47:35 +00:00
s_nexttoward.c
s_nextup.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_remquo.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_rint.c Use libm_alias_double for more dbl-64 functions. 2017-10-03 17:47:35 +00:00
s_round.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_roundeven.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_scalbln.c [BZ #6803] Set errno for scalbln, scalbn 2014-06-20 07:48:20 +05:30
s_scalbn.c Make scalbn set errno (bug 6803). 2015-09-16 21:11:00 +00:00
s_setpayload_main.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_setpayload.c Use libm_alias_double for some dbl-64 functions. 2017-09-29 23:54:33 +00:00
s_setpayloadsig.c Use libm_alias_double for some dbl-64 functions. 2017-09-29 23:54:33 +00:00
s_signbit.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_sin.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_sincos.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_tan.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_tanh.c Use libm_alias_double for some dbl-64 functions. 2017-09-29 23:54:33 +00:00
s_totalorder.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_totalordermag.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_trunc.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_ufromfp.c Use libm_alias_double for some dbl-64 functions. 2017-09-29 23:54:33 +00:00
s_ufromfpx.c Use libm_alias_double for some dbl-64 functions. 2017-09-29 23:54:33 +00:00
sincos32.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
sincos32.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
sincostab.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
slowexp.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
t_exp2.h
t_exp.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
uasncs.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
uatan.tbl Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
uexp.h Remove slow paths from pow 2018-02-12 10:47:09 +00:00
uexp.tbl Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
ulog.h Remove slow paths from log 2018-02-07 12:24:43 +00:00
ulog.tbl Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
upow.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
upow.tbl Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
urem.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
usncs.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
utan.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
utan.tbl Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
x2y2m1.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
x2y2m1f.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00