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glibc/sysdeps/powerpc/fpu/e_hypotf.c
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/* Pythagorean addition using floats | |
Copyright (C) 2011-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
Contributed by Adhemerval Zanella <azanella@br.ibm.com>, 2011 | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Library General Public License as | |
published by the Free Software Foundation; either version 2 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 | |
Library General Public License for more details. | |
You should have received a copy of the GNU Library General Public | |
License along with the GNU C Library; see the file COPYING.LIB. If | |
not, see <http://www.gnu.org/licenses/>. */ | |
#include <math.h> | |
#include <math_private.h> | |
#include <stdint.h> | |
/* __ieee754_hypotf(x,y) | |
This a FP only version without any FP->INT conversion. | |
It is similar to default C version, making appropriates | |
overflow and underflows checks as using double precision | |
instead of scaling. */ | |
#ifdef _ARCH_PWR7 | |
/* POWER7 isinf and isnan optimizations are fast. */ | |
# define TEST_INF_NAN(x, y) \ | |
if (isinff(x) || isinff(y)) \ | |
return INFINITY; \ | |
if (isnanf(x) || isnanf(y)) \ | |
return NAN; | |
# else | |
/* For POWER6 and below isinf/isnan triggers LHS and PLT calls are | |
* costly (especially for POWER6). */ | |
# define GET_TWO_FLOAT_WORD(f1,f2,i1,i2) \ | |
do { \ | |
ieee_float_shape_type gf_u1; \ | |
ieee_float_shape_type gf_u2; \ | |
gf_u1.value = (f1); \ | |
gf_u2.value = (f2); \ | |
(i1) = gf_u1.word & 0x7fffffff; \ | |
(i2) = gf_u2.word & 0x7fffffff; \ | |
} while (0) | |
# define TEST_INF_NAN(x, y) \ | |
do { \ | |
uint32_t hx, hy; \ | |
GET_TWO_FLOAT_WORD(x, y, hx, hy); \ | |
if (hy > hx) { \ | |
uint32_t ht = hx; hx = hy; hy = ht; \ | |
} \ | |
if (hx >= 0x7f800000) { \ | |
if (hx == 0x7f800000 || hy == 0x7f800000) \ | |
return INFINITY; \ | |
return NAN; \ | |
} \ | |
} while (0) | |
#endif | |
float | |
__ieee754_hypotf (float x, float y) | |
{ | |
TEST_INF_NAN (x, y); | |
return __ieee754_sqrt ((double) x * x + (double) y * y); | |
} | |
strong_alias (__ieee754_hypotf, __hypotf_finite) |