diff options
Diffstat (limited to 'libm')
| -rw-r--r-- | libm/Makefile.in | 2 | ||||
| -rw-r--r-- | libm/float_wrappers.c | 1 | ||||
| -rw-r--r-- | libm/s_lrint.c | 94 |
3 files changed, 95 insertions, 2 deletions
diff --git a/libm/Makefile.in b/libm/Makefile.in index 316b1ffc3..bf6aafb06 100644 --- a/libm/Makefile.in +++ b/libm/Makefile.in @@ -52,7 +52,7 @@ libm_CSRC := \ e_sqrt.c k_cos.c k_rem_pio2.c k_sin.c k_standard.c k_tan.c \ s_asinh.c s_atan.c s_cbrt.c s_ceil.c s_copysign.c s_cos.c \ s_erf.c s_expm1.c s_fabs.c s_finite.c s_floor.c s_frexp.c \ - s_ilogb.c s_ldexp.c s_lib_version.c s_lround.c s_llround.c \ + s_ilogb.c s_ldexp.c s_lib_version.c s_lrint.c s_lround.c s_llround.c \ s_log1p.c s_logb.c s_matherr.c s_modf.c s_nextafter.c s_round.c \ s_rint.c s_scalbn.c s_signgam.c s_significand.c s_sin.c s_tan.c \ s_tanh.c w_acos.c w_acosh.c w_asin.c w_atan2.c w_atanh.c w_cabs.c \ diff --git a/libm/float_wrappers.c b/libm/float_wrappers.c index 298453d31..fdafd9489 100644 --- a/libm/float_wrappers.c +++ b/libm/float_wrappers.c @@ -21,7 +21,6 @@ #undef L_fminf /*float fminf(float, float);*/ #undef L_llrintf /*long long llrintf(float);*/ #undef L_log2f /*float log2f(float);*/ -#undef L_lrintf /*long lrintf(float);*/ #undef L_nearbyintf /*float nearbyintf(float);*/ #undef L_nexttowardf /*float nexttowardf(float, long double);*/ #undef L_remquof /*float remquof(float, float, int *);*/ diff --git a/libm/s_lrint.c b/libm/s_lrint.c new file mode 100644 index 000000000..61c521240 --- /dev/null +++ b/libm/s_lrint.c @@ -0,0 +1,94 @@ +/* Round argument to nearest integral value according to current rounding + direction. + Copyright (C) 1997, 2004 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <math.h> + +#include "math_private.h" + +static const double two52[2] = +{ + 4.50359962737049600000e+15, /* 0x43300000, 0x00000000 */ + -4.50359962737049600000e+15, /* 0xC3300000, 0x00000000 */ +}; + + +libm_hidden_proto(lrint) +long int +lrint (double x) +{ + int32_t j0; + u_int32_t i0,i1; + volatile double w; + double t; + long int result; + int sx; + + EXTRACT_WORDS (i0, i1, x); + j0 = ((i0 >> 20) & 0x7ff) - 0x3ff; + sx = i0 >> 31; + i0 &= 0xfffff; + i0 |= 0x100000; + + if (j0 < 20) + { + if (j0 < -1) + return 0; + else + { + w = two52[sx] + x; + t = w - two52[sx]; + EXTRACT_WORDS (i0, i1, t); + j0 = ((i0 >> 20) & 0x7ff) - 0x3ff; + i0 &= 0xfffff; + i0 |= 0x100000; + + result = i0 >> (20 - j0); + } + } + else if (j0 < (int32_t) (8 * sizeof (long int)) - 1) + { + if (j0 >= 52) + result = ((long int) i0 << (j0 - 20)) | (i1 << (j0 - 52)); + else + { + w = two52[sx] + x; + t = w - two52[sx]; + EXTRACT_WORDS (i0, i1, t); + j0 = ((i0 >> 20) & 0x7ff) - 0x3ff; + i0 &= 0xfffff; + i0 |= 0x100000; + + if (j0 == 20) + result = (long int) i0; + else + result = ((long int) i0 << (j0 - 20)) | (i1 >> (52 - j0)); + } + } + else + { + /* The number is too large. It is left implementation defined + what happens. */ + return (long int) x; + } + + return sx ? -result : result; +} +libm_hidden_def(lrint) |