diff options
| author | Andreas Schwab <schwab@linux-m68k.org> | 2012-03-15 15:16:31 +0100 |
|---|---|---|
| committer | Andreas Schwab <schwab@linux-m68k.org> | 2012-03-15 18:13:52 +0100 |
| commit | 11e0098ef008db301a82b753dda466dc61cdd0bc (patch) | |
| tree | d5c7991f6295c4f87005d1e9deb5d220ecc3d4a5 /sysdeps/powerpc | |
| parent | e85b09d0642e546d3049a33bf1662404b374d376 (diff) | |
| download | glibc-11e0098ef008db301a82b753dda466dc61cdd0bc.zip glibc-11e0098ef008db301a82b753dda466dc61cdd0bc.tar.gz glibc-11e0098ef008db301a82b753dda466dc61cdd0bc.tar.bz2 | |
Use double precision instead of scaling for powerpc __ieee754_hypotf
Diffstat (limited to 'sysdeps/powerpc')
| -rw-r--r-- | sysdeps/powerpc/fpu/e_hypotf.c | 44 | ||||
| -rw-r--r-- | sysdeps/powerpc/fpu/libm-test-ulps | 5 |
2 files changed, 9 insertions, 40 deletions
diff --git a/sysdeps/powerpc/fpu/e_hypotf.c b/sysdeps/powerpc/fpu/e_hypotf.c index 3838f53..92e824d 100644 --- a/sysdeps/powerpc/fpu/e_hypotf.c +++ b/sysdeps/powerpc/fpu/e_hypotf.c @@ -1,5 +1,5 @@ /* Pythagorean addition using floats - Copyright (C) 2011 Free Software Foundation, Inc. + Copyright (C) 2011, 2012 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Adhemerval Zanella <azanella@br.ibm.com>, 2011 @@ -22,21 +22,13 @@ static const float two30 = 1.0737418e09; -static const float two50 = 1.1259000e15; -static const float two60 = 1.1529221e18; -static const float two126 = 8.5070592e+37; -static const float twoM50 = 8.8817842e-16; -static const float twoM60 = 6.7762644e-21; -static const float pdnum = 1.1754939e-38; - /* __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 well scaling when it - * is needed. - */ + + 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. */ @@ -92,27 +84,7 @@ __ieee754_hypotf (float x, float y) { return x + y; } - if (x > two50) - { - x *= twoM60; - y *= twoM60; - return __ieee754_sqrtf (x * x + y * y) / twoM60; - } - if (y < twoM50) - { - if (y <= pdnum) - { - x *= two126; - y *= two126; - return __ieee754_sqrtf (x * x + y * y) / two126; - } - else - { - x *= two60; - y *= two60; - return __ieee754_sqrtf (x * x + y * y) / two60; - } - } - return __ieee754_sqrtf (x * x + y * y); + + return __ieee754_sqrt ((double) x * x + (double) y * y); } strong_alias (__ieee754_hypotf, __hypotf_finite) diff --git a/sysdeps/powerpc/fpu/libm-test-ulps b/sysdeps/powerpc/fpu/libm-test-ulps index eaa734f..9e00029 100644 --- a/sysdeps/powerpc/fpu/libm-test-ulps +++ b/sysdeps/powerpc/fpu/libm-test-ulps @@ -1119,10 +1119,7 @@ ildouble: 1 ldouble: 1 Test "hypot (0x1.234566p-126, 0x1.234566p-126) == 1.891441686191081936598531534017449451173e-38": double: 1 -float: 6 idouble: 1 -Test "hypot (0x3p125, 0x4p125) == 0x5p125": -float: 1 Test "hypot (12.4, -0.7) == 12.419742348374220601176836866763271": double: 1 float: 1 @@ -2247,7 +2244,7 @@ ldouble: 1 Function: "hypot": double: 1 -float: 6 +float: 1 idouble: 1 ifloat: 1 ildouble: 1 |