diff options
Diffstat (limited to 'sysdeps/powerpc/fpu/e_hypot.c')
| -rw-r--r-- | sysdeps/powerpc/fpu/e_hypot.c | 98 |
1 files changed, 24 insertions, 74 deletions
diff --git a/sysdeps/powerpc/fpu/e_hypot.c b/sysdeps/powerpc/fpu/e_hypot.c index b55db6d259..30d00e2603 100644 --- a/sysdeps/powerpc/fpu/e_hypot.c +++ b/sysdeps/powerpc/fpu/e_hypot.c @@ -1,5 +1,5 @@ /* Pythagorean addition using doubles - Copyright (C) 2011-2018 Free Software Foundation, Inc. + Copyright (C) 2011-2019 Free Software Foundation, Inc. This file is part of the GNU C Library Contributed by Adhemerval Zanella <azanella@br.ibm.com>, 2011 @@ -15,22 +15,13 @@ 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/>. */ + not, see <https://www.gnu.org/licenses/>. */ #include <math.h> #include <math_private.h> #include <math-underflow.h> #include <stdint.h> -static const double two60 = 1.152921504606847e+18; -static const double two500 = 3.2733906078961419e+150; -static const double two600 = 4.149515568880993e+180; -static const double two1022 = 4.49423283715579e+307; -static const double twoM500 = 3.054936363499605e-151; -static const double twoM600 = 2.4099198651028841e-181; -static const double two60factor = 1.5592502418239997e+290; -static const double pdnum = 2.225073858507201e-308; - /* __ieee754_hypot(x,y) * * This a FP only version without any FP->INT conversion. @@ -39,53 +30,18 @@ static const double pdnum = 2.225073858507201e-308; * is needed. */ -#ifdef _ARCH_PWR7 -/* POWER7 isinf and isnan optimization are fast. */ -# define TEST_INF_NAN(x, y) \ - if ((isinf(x) || isinf(y)) \ - && !issignaling (x) && !issignaling (y)) \ - return INFINITY; \ - if (isnan(x) || isnan(y)) \ - return x + y; -# else -/* For POWER6 and below isinf/isnan triggers LHS and PLT calls are - * costly (especially for POWER6). */ -# define GET_TW0_HIGH_WORD(d1,d2,i1,i2) \ - do { \ - ieee_double_shape_type gh_u1; \ - ieee_double_shape_type gh_u2; \ - gh_u1.value = (d1); \ - gh_u2.value = (d2); \ - (i1) = gh_u1.parts.msw & 0x7fffffff; \ - (i2) = gh_u2.parts.msw & 0x7fffffff; \ - } while (0) - -# define TEST_INF_NAN(x, y) \ - do { \ - uint32_t hx, hy; \ - GET_TW0_HIGH_WORD(x, y, hx, hy); \ - if (hy > hx) { \ - uint32_t ht = hx; hx = hy; hy = ht; \ - } \ - if (hx >= 0x7ff00000) { \ - if ((hx == 0x7ff00000 || hy == 0x7ff00000) \ - && !issignaling (x) && !issignaling (y)) \ - return INFINITY; \ - return x + y; \ - } \ - } while (0) - -#endif - - double __ieee754_hypot (double x, double y) { + if ((isinf (x) || isinf (y)) + && !issignaling (x) && !issignaling (y)) + return INFINITY; + if (isnan (x) || isnan (y)) + return x + y; + x = fabs (x); y = fabs (y); - TEST_INF_NAN (x, y); - if (y > x) { double t = x; @@ -94,40 +50,34 @@ __ieee754_hypot (double x, double y) } if (y == 0.0) return x; + /* if y is higher enough, y * 2^60 might overflow. The tests if y >= 1.7976931348623157e+308/2^60 (two60factor) and uses the appropriate check to avoid the overflow exception generation. */ - if (y > two60factor) - { - if ((x / y) > two60) - return x + y; - } - else - { - if (x > (y * two60)) - return x + y; - } - if (x > two500) + if (y <= 0x1.fffffffffffffp+963 && x > (y * 0x1p+60)) + return x + y; + + if (x > 0x1p+500) { - x *= twoM600; - y *= twoM600; - return sqrt (x * x + y * y) / twoM600; + x *= 0x1p-600; + y *= 0x1p-600; + return sqrt (x * x + y * y) / 0x1p-600; } - if (y < twoM500) + if (y < 0x1p-500) { - if (y <= pdnum) + if (y <= 0x0.fffffffffffffp-1022) { - x *= two1022; - y *= two1022; - double ret = sqrt (x * x + y * y) / two1022; + x *= 0x1p+1022; + y *= 0x1p+1022; + double ret = sqrt (x * x + y * y) / 0x1p+1022; math_check_force_underflow_nonneg (ret); return ret; } else { - x *= two600; - y *= two600; - return sqrt (x * x + y * y) / two600; + x *= 0x1p+600; + y *= 0x1p+600; + return sqrt (x * x + y * y) / 0x1p+600; } } return sqrt (x * x + y * y); |