glibc/math/Versions
Joseph Myers 41c67149b9 Add roundeven, roundevenf, roundevenl.
TS 18661-1 defines roundeven functions that round a floating-point
number to the nearest integer, in that floating-point type, with ties
rounding to even (whereas the round functions round ties away from
zero).  As with other such functions, they raise no exceptions apart
from "invalid" for signaling NaNs.  There was a previous user request
for this functionality in glibc in
<https://sourceware.org/ml/libc-help/2015-02/msg00005.html>.

This patch implements these functions for glibc.  The implementations
use integer bit-manipulation (or roundeven on the high and low parts,
in the IBM long double case).  It's possible that there may be faster
approaches on some architectures (in particular, on AArch64 the frintn
instruction should do exactly what's required); I'll leave it to
architecture maintainers or others interested to implement such
architecture-specific versions if desired.  (Where architectures have
instructions to round to nearest integer in the current rounding mode,
implementations saving and restoring the rounding mode - and dealing
with exceptions if those instructions generate "inexact" - are also
possible, though their performance depends on the cost of manipulating
exceptions / rounding mode state.)

Tested for x86_64, x86, mips64 and powerpc.

	* math/bits/mathcalls.h [__GLIBC_USE (IEC_60559_BFP_EXT)]
	(roundeven): New declaration.
	* math/tgmath.h [__GLIBC_USE (IEC_60559_BFP_EXT)] (roundeven): New
	macro.
	* math/Versions (roundeven): New libm symbol at version
	GLIBC_2.25.
	(roundevenf): Likewise.
	(roundevenl): Likewise.
	* math/Makefile (libm-calls): Add s_roundevenF.
	* math/libm-test.inc (roundeven_test_data): New array.
	(roundeven_test): New function.
	(main): Call roundeven_test.
	* math/test-tgmath.c (NCALLS): Increase to 134.
	(F(compile_test)): Call roundeven.
	(F(roundeven)): New function.
	* manual/arith.texi (Rounding Functions): Document roundeven,
	roundevenf and roundevenl.
	* manual/libm-err-tab.pl (@all_functions): Add roundeven.
	* include/math.h (roundeven): Use libm_hidden_proto.
	* sysdeps/ieee754/dbl-64/s_roundeven.c: New file.
	* sysdeps/ieee754/dbl-64/wordsize-64/s_roundeven.c: Likewise.
	* sysdeps/ieee754/flt-32/s_roundevenf.c: Likewise.
	* sysdeps/ieee754/ldbl-128/s_roundevenl.c: Likewise.
	* sysdeps/ieee754/ldbl-128ibm/s_roundevenl.c: Likewise.
	* sysdeps/ieee754/ldbl-96/s_roundevenl.c: Likewise.
	* sysdeps/ieee754/ldbl-opt/Makefile (libnldbl-calls): Add
	roundeven.
	(CFLAGS-nldbl-roundeven.c): New variable.
	* sysdeps/ieee754/ldbl-opt/nldbl-roundeven.c: New file.
	* sysdeps/nacl/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/aarch64/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/alpha/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/arm/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/hppa/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/i386/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/ia64/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/m68k/coldfire/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/m68k/m680x0/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/microblaze/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/mips/mips32/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/mips/mips64/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/nios2/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libm.abilist:
	Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libm.abilist:
	Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/libm-le.abilist:
	Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/libm.abilist:
	Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-32/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-64/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/sh/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc32/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc64/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libm.abilist:
	Likewise.
	* sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libm.abilist:
	Likewise.
	* sysdeps/unix/sysv/linux/tile/tilepro/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/x86_64/64/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/x86_64/x32/libm.abilist: Likewise.
2016-12-21 01:48:27 +00:00

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libc {
GLIBC_2.0 {
# functions used in inline functions or macros
__isnan; __isnanf; __isnanl; __finite; __finitef; __finitel;
__isinf; __isinff; __isinfl;
# global variables
__fpu_control;
# c*
copysign; copysignf; copysignl;
# f*
finite; finitef; finitel; frexp; frexpf; frexpl;
# i*
isinf; isinff; isinfl; isnan; isnanf; isnanl; ldexp; ldexpf; ldexpl;
# m*
modf; modff; modfl;
# s*
scalbn; scalbnf; scalbnl;
}
GLIBC_2.1 {
# functions used in inline functions or macros
__signbit; __signbitf; __signbitl;
# s*
scalbln; scalblnf; scalblnl;
}
GLIBC_2.20 {
}
}
libm {
GLIBC_2.0 {
# mathematical functions
acos; acosf; acosl;
acosh; acoshf; acoshl;
asin; asinf; asinl;
asinh; asinhf; asinhl;
atan2; atan2f; atan2l;
atan; atanf; atanl;
atanh; atanhf; atanhl;
cbrt; cbrtf; cbrtl;
ceil; ceilf; ceill;
copysign; copysignf; copysignl;
cos; cosf; cosl;
coshf; cosh; coshl;
drem; dremf; dreml;
erf; erff; erfl;
erfc; erfcf; erfcl;
exp; expf; expl;
expm1; expm1f; expm1l;
fabs; fabsf; fabsl;
finite; finitef; finitel;
floor; floorf; floorl;
fmod; fmodf; fmodl;
frexp; frexpf; frexpl;
gamma; gammaf; gammal;
gamma_r; gammaf_r; gammal_r;
hypot; hypotf; hypotl;
ilogb; ilogbf; ilogbl;
j0; j0f; j0l;
j1; j1f; j1l;
jn; jnf; jnl;
ldexp; ldexpf; ldexpl;
lgamma; lgammaf; lgammal;
lgamma_r; lgammaf_r; lgammal_r;
log10; log10f; log10l;
log1p; log1pf; log1pl;
log; logf; logl;
logb; logbf; logbl;
matherr;
modf; modff; modfl;
nextafter; nextafterf; nextafterl;
pow; powf; powl;
remainder; remainderf; remainderl;
rint; rintf; rintl;
scalb; scalbf; scalbl;
scalbn; scalbnf; scalbnl;
significand; significandf; significandl;
sin; sinf; sinl;
sinh; sinhf; sinhl;
sqrt; sqrtf; sqrtl;
tan; tanf; tanl;
tanh; tanhf; tanhl;
y0; y0f; y0l;
y1; y1f; y1l;
yn; ynf; ynl;
# global variables
_LIB_VERSION; signgam;
}
GLIBC_2.1 {
# mathematical functions
exp2; exp2f; # exp2l; -- bug omitted this until GLIBC_2.4 (below)
exp10; exp10f; exp10l;
fdim; fdimf; fdiml;
fma; fmaf; fmal;
fmax; fmaxf; fmaxl;
fmin; fminf; fminl;
log2; log2f; log2l;
nan; nanf; nanl;
nearbyint; nearbyintf; nearbyintl;
nexttoward; nexttowardf; nexttowardl;
pow10; pow10f; pow10l;
remquo; remquof; remquol;
lrint; lrintf; lrintl;
llrint; llrintf; llrintl;
round; roundf; roundl;
lround; lroundf; lroundl;
llround; llroundf; llroundl;
scalbln; scalblnf; scalblnl;
sincos; sincosf; sincosl;
trunc; truncf; truncl;
tgamma; tgammaf; tgammal;
# complex functions
cabs; cabsf; cabsl;
cacos; cacosf; cacosl;
cacosh; cacoshf; cacoshl;
carg; cargf; cargl;
casin; casinf; casinl;
casinh; casinhf; casinhl;
catan; catanf; catanl;
catanh; catanhf; catanhl;
ccos; ccosf; ccosl;
ccosh; ccoshf; ccoshl;
cexp; cexpf; cexpl;
cimag; cimagf; cimagl;
clog; clogf; clogl;
clog10; clog10f; clog10l;
__clog10; __clog10f; __clog10l;
conj; conjf; conjl;
cpow; cpowf; cpowl;
cproj; cprojf; cprojl;
creal; crealf; creall;
csin; csinf; csinl;
csinh; csinhf; csinhl;
csqrt; csqrtf; csqrtl;
ctan; ctanf; ctanl;
ctanh; ctanhf; ctanhl;
# fp environment functions
feclearexcept; fegetenv; fegetexceptflag;
fegetround; feholdexcept; feraiseexcept;
fesetenv; fesetexceptflag; fesetround;
fetestexcept; feupdateenv;
# functions used in inline functions or macros
__finite; __finitef; __finitel;
__fpclassify; __fpclassifyf; __fpclassifyl;
__signbit; __signbitf; __signbitl;
}
GLIBC_2.2 {
# fp environment functions changes from ISO C99 TR1
feclearexcept; fegetenv; fegetexceptflag; feraiseexcept;
fesetenv; fesetexceptflag; feupdateenv;
# fp environment function
feenableexcept; fedisableexcept; fegetexcept;
}
GLIBC_2.4 {
# A bug in sysdeps/generic/w_exp2.c kept this from appearing
# in GLIBC_2.1 as it should have on platforms using that
# implementation file. On others, sysdeps/CPU/Versions now
# puts exp2l in GLIBC_2.1, which will override this entry.
exp2l;
}
GLIBC_2.15 {
# Optimized -ffinite-math-only entry points
__acos_finite; __acosf_finite; __acosl_finite;
__acosh_finite; __acoshf_finite; __acoshl_finite;
__asin_finite; __asinf_finite; __asinl_finite;
__atan2_finite; __atan2f_finite; __atan2l_finite;
__atanh_finite; __atanhf_finite; __atanhl_finite;
__cosh_finite; __coshf_finite; __coshl_finite;
__exp10_finite; __exp10f_finite; __exp10l_finite;
__exp2_finite; __exp2f_finite; __exp2l_finite;
__fmod_finite; __fmodf_finite; __fmodl_finite;
__hypot_finite; __hypotf_finite; __hypotl_finite;
__j0_finite; __j0f_finite; __j0l_finite;
__y0_finite; __y0f_finite; __y0l_finite;
__j1_finite; __j1f_finite; __j1l_finite;
__y1_finite; __y1f_finite; __y1l_finite;
__jn_finite; __jnf_finite; __jnl_finite;
__yn_finite; __ynf_finite; __ynl_finite;
__lgamma_r_finite; __lgammaf_r_finite; __lgammal_r_finite;
__log_finite; __logf_finite; __logl_finite;
__log10_finite; __log10f_finite; __log10l_finite;
__log2_finite; __log2f_finite; __log2l_finite;
__pow_finite; __powf_finite; __powl_finite;
__remainder_finite; __remainderf_finite; __remainderl_finite;
__scalb_finite; __scalbf_finite; __scalbl_finite;
__sinh_finite; __sinhf_finite; __sinhl_finite;
__sqrt_finite; __sqrtf_finite; __sqrtl_finite;
__gamma_r_finite; __gammaf_r_finite; __gammal_r_finite;
__exp_finite; __expf_finite; __expl_finite;
}
GLIBC_2.18 {
__issignaling; __issignalingf; __issignalingl;
}
GLIBC_2.23 {
# The __signgam name must be exported for the signgam weak alias
# to work. New symbol versions of lgamma* that set __signgam are
# needed to preserve compatibility with old binaries that have a
# dynamic symbol for signgam but not __signgam.
lgamma; lgammaf; lgammal; __signgam;
}
GLIBC_2.24 {
nextup; nextupf; nextupl;
nextdown; nextdownf; nextdownl;
}
GLIBC_2.25 {
fesetexcept; fetestexceptflag; fegetmode; fesetmode;
__iscanonicall; __iseqsigf; __iseqsig; __iseqsigl;
totalorder; totalorderf; totalorderl;
totalordermag; totalordermagf; totalordermagl;
getpayload; getpayloadf; getpayloadl;
canonicalize; canonicalizef; canonicalizel;
setpayload; setpayloadf; setpayloadl;
setpayloadsig; setpayloadsigf; setpayloadsigl;
llogb; llogbf; llogbl;
fmaxmag; fmaxmagf; fmaxmagl; fminmag; fminmagf; fminmagl;
roundeven; roundevenf; roundevenl;
}
}