From 17ce9917aef371cc762884c671dee39f7c13968a Mon Sep 17 00:00:00 2001 From: Adhemerval Zanella Date: Mon, 15 Apr 2013 21:54:06 -0500 Subject: PowerPC: logb/logbf/logbl multilib for PowerPC32 --- sysdeps/ieee754/ldbl-128ibm/s_logbl.c | 2 + sysdeps/powerpc/powerpc32/fpu/multiarch/Makefile | 5 +- sysdeps/powerpc/powerpc32/fpu/multiarch/s_logb-c.c | 10 +++ .../powerpc32/fpu/multiarch/s_logb-power7.c | 72 ++++++++++++++++++++ sysdeps/powerpc/powerpc32/fpu/multiarch/s_logb.c | 41 ++++++++++++ .../powerpc/powerpc32/fpu/multiarch/s_logbf-c.c | 8 +++ .../powerpc32/fpu/multiarch/s_logbf-power7.c | 61 +++++++++++++++++ sysdeps/powerpc/powerpc32/fpu/multiarch/s_logbf.c | 32 +++++++++ .../powerpc/powerpc32/fpu/multiarch/s_logbl-c.c | 7 ++ .../powerpc32/fpu/multiarch/s_logbl-power7.c | 70 +++++++++++++++++++ sysdeps/powerpc/powerpc32/fpu/multiarch/s_logbl.c | 32 +++++++++ sysdeps/powerpc/powerpc32/power7/fpu/s_logb.c | 78 ---------------------- sysdeps/powerpc/powerpc32/power7/fpu/s_logbf.c | 60 ----------------- sysdeps/powerpc/powerpc32/power7/fpu/s_logbl.c | 70 ------------------- 14 files changed, 339 insertions(+), 209 deletions(-) create mode 100644 sysdeps/powerpc/powerpc32/fpu/multiarch/s_logb-c.c create mode 100644 sysdeps/powerpc/powerpc32/fpu/multiarch/s_logb-power7.c create mode 100644 sysdeps/powerpc/powerpc32/fpu/multiarch/s_logb.c create mode 100644 sysdeps/powerpc/powerpc32/fpu/multiarch/s_logbf-c.c create mode 100644 sysdeps/powerpc/powerpc32/fpu/multiarch/s_logbf-power7.c create mode 100644 sysdeps/powerpc/powerpc32/fpu/multiarch/s_logbf.c create mode 100644 sysdeps/powerpc/powerpc32/fpu/multiarch/s_logbl-c.c create mode 100644 sysdeps/powerpc/powerpc32/fpu/multiarch/s_logbl-power7.c create mode 100644 sysdeps/powerpc/powerpc32/fpu/multiarch/s_logbl.c delete mode 100644 sysdeps/powerpc/powerpc32/power7/fpu/s_logb.c delete mode 100644 sysdeps/powerpc/powerpc32/power7/fpu/s_logbf.c delete mode 100644 sysdeps/powerpc/powerpc32/power7/fpu/s_logbl.c diff --git a/sysdeps/ieee754/ldbl-128ibm/s_logbl.c b/sysdeps/ieee754/ldbl-128ibm/s_logbl.c index 6cbfcfa1cc..28a50deadc 100644 --- a/sysdeps/ieee754/ldbl-128ibm/s_logbl.c +++ b/sysdeps/ieee754/ldbl-128ibm/s_logbl.c @@ -44,4 +44,6 @@ __logbl (long double x) return (long double) (rhx - 1023); } +#ifndef __logbl long_double_symbol (libm, __logbl, logbl); +#endif diff --git a/sysdeps/powerpc/powerpc32/fpu/multiarch/Makefile b/sysdeps/powerpc/powerpc32/fpu/multiarch/Makefile index 372af26296..10d12c16e2 100644 --- a/sysdeps/powerpc/powerpc32/fpu/multiarch/Makefile +++ b/sysdeps/powerpc/powerpc32/fpu/multiarch/Makefile @@ -33,7 +33,10 @@ libm-sysdep_routines += s_llrintf-power6 s_llrintf-power4 s_llrintf-c \ s_finite-power7 s_finite-c \ s_finitef-c \ s_isinf-power7 s_isinf-c \ - s_isinff-c + s_isinff-c \ + s_logbl-power7 s_logbl-c \ + s_logb-power7 s_logb-c \ + s_logbf-power7 s_logbf-c CFLAGS-s_llround.c = -fno-builtin-llroundf CFLAGS-s_lround.c = -fno-builtin-lroundf diff --git a/sysdeps/powerpc/powerpc32/fpu/multiarch/s_logb-c.c b/sysdeps/powerpc/powerpc32/fpu/multiarch/s_logb-c.c new file mode 100644 index 0000000000..eb98d7436c --- /dev/null +++ b/sysdeps/powerpc/powerpc32/fpu/multiarch/s_logb-c.c @@ -0,0 +1,10 @@ +#include + +#undef weak_alias +#define weak_alias(a, b) +#undef strong_alias +#define strong_alias(a, b) + +#define __logb __logb_ppc32 + +#include diff --git a/sysdeps/powerpc/powerpc32/fpu/multiarch/s_logb-power7.c b/sysdeps/powerpc/powerpc32/fpu/multiarch/s_logb-power7.c new file mode 100644 index 0000000000..d54525b080 --- /dev/null +++ b/sysdeps/powerpc/powerpc32/fpu/multiarch/s_logb-power7.c @@ -0,0 +1,72 @@ +/* logb(). PowerPC/POWER7 version. + Copyright (C) 2012-2013 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + 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, see + . */ + +#include +#include + +__typeof (__logb) __logb_power7 __attribute__ ((__target__ ("cpu=power7"))); + +/* This implementation avoids FP to INT conversions by using VSX + bitwise instructions over FP values. */ + +static const double two1div52 = 2.220446049250313e-16; /* 1/2**52 */ +static const double two10m1 = -1023.0; /* 2**10 -1 */ + +/* FP mask to extract the exponent. */ +static const union { + unsigned long long mask; + double d; +} mask = { 0x7ff0000000000000ULL }; + +double +__logb_power7 (double x) +{ + double ret; + + if (__builtin_expect (x == 0.0, 0)) + /* Raise FE_DIVBYZERO and return -HUGE_VAL[LF]. */ + return -1.0 / __builtin_fabs (x); + + /* ret = x & 0x7ff0000000000000; */ + asm ( + "xxland %x0,%x1,%x2\n" + "fcfid %0,%0" + : "=f" (ret) + : "f" (x), "f" (mask.d)); + /* ret = (ret >> 52) - 1023.0; */ + ret = (ret * two1div52) + two10m1; + if (__builtin_expect (ret > -two10m1, 0)) + /* Multiplication is used to set logb (+-INF) = INF. */ + return (x * x); + else if (__builtin_expect (ret == two10m1, 0)) + { + /* POSIX specifies that denormal numbers are treated as + though they were normalized. */ + int32_t lx, ix; + int ma; + + EXTRACT_WORDS (ix, lx, x); + if (ix == 0) + ma = __builtin_clz (lx) + 32; + else + ma = __builtin_clz (ix); + return (double) (-1023 - (ma - 12)); + } + /* Test to avoid logb_downward (0.0) == -0.0. */ + return ret == -0.0 ? 0.0 : ret; +} diff --git a/sysdeps/powerpc/powerpc32/fpu/multiarch/s_logb.c b/sysdeps/powerpc/powerpc32/fpu/multiarch/s_logb.c new file mode 100644 index 0000000000..f55cf519e6 --- /dev/null +++ b/sysdeps/powerpc/powerpc32/fpu/multiarch/s_logb.c @@ -0,0 +1,41 @@ +/* Multiple versions of s_logb. + Copyright (C) 2013 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + 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, see + . */ + +#include +#include +#include +#include "init-arch.h" + +extern __typeof (__logb) __logb_ppc32 attribute_hidden; +extern __typeof (__logb) __logb_power7 attribute_hidden; + +libc_ifunc (__logb, + (hwcap & PPC_FEATURE_ARCH_2_06) + ? __logb_power7 + : __logb_ppc32); + +weak_alias (__logb, logb) + +#ifdef NO_LONG_DOUBLE +strong_alias (__logb, __logbl) +weak_alias (__logb, logbl) +#endif + +#if LONG_DOUBLE_COMPAT (libm, GLIBC_2_0) +compat_symbol (libm, logb, logbl, GLIBC_2_0); +#endif diff --git a/sysdeps/powerpc/powerpc32/fpu/multiarch/s_logbf-c.c b/sysdeps/powerpc/powerpc32/fpu/multiarch/s_logbf-c.c new file mode 100644 index 0000000000..b569a1cf45 --- /dev/null +++ b/sysdeps/powerpc/powerpc32/fpu/multiarch/s_logbf-c.c @@ -0,0 +1,8 @@ +#include + +#undef weak_alias +#define weak_alias(a, b) + +#define __logbf __logbf_ppc32 + +#include diff --git a/sysdeps/powerpc/powerpc32/fpu/multiarch/s_logbf-power7.c b/sysdeps/powerpc/powerpc32/fpu/multiarch/s_logbf-power7.c new file mode 100644 index 0000000000..5d87c6fcc4 --- /dev/null +++ b/sysdeps/powerpc/powerpc32/fpu/multiarch/s_logbf-power7.c @@ -0,0 +1,61 @@ +/* logbf(). PowerPC/POWER7 version. + Copyright (C) 2012-2013 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + 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, see + . */ + +#include + +__typeof (__logbf) __logbf_power7 __attribute__ ((__target__ ("cpu=power7"))); + +/* This implementation avoids FP to INT conversions by using VSX + bitwise instructions over FP values. */ + +static const double two1div52 = 2.220446049250313e-16; /* 1/2**52 */ +static const double two10m1 = -1023.0; /* -2**10 + 1 */ +static const double two7m1 = -127.0; /* -2**7 + 1 */ + +/* FP mask to extract the exponent. */ +static const union { + unsigned long long mask; + double d; +} mask = { 0x7ff0000000000000ULL }; + +float +__logbf_power7 (float x) +{ + /* VSX operation are all done internally as double. */ + double ret; + + if (__builtin_expect (x == 0.0, 0)) + /* Raise FE_DIVBYZERO and return -HUGE_VAL[LF]. */ + return -1.0 / __builtin_fabsf (x); + + /* ret = x & 0x7f800000; */ + asm ( + "xxland %x0,%x1,%x2\n" + "fcfid %0,%0" + : "=f"(ret) + : "f" (x), "f" (mask.d)); + /* ret = (ret >> 52) - 1023.0, since ret is double. */ + ret = (ret * two1div52) + two10m1; + if (__builtin_expect (ret > -two7m1, 0)) + /* Multiplication is used to set logb (+-INF) = INF. */ + return (x * x); + /* Since operations are done with double we don't need + additional tests for subnormal numbers. + The test is to avoid logb_downward (0.0) == -0.0. */ + return ret == -0.0 ? 0.0 : ret; +} diff --git a/sysdeps/powerpc/powerpc32/fpu/multiarch/s_logbf.c b/sysdeps/powerpc/powerpc32/fpu/multiarch/s_logbf.c new file mode 100644 index 0000000000..d0b50b0a54 --- /dev/null +++ b/sysdeps/powerpc/powerpc32/fpu/multiarch/s_logbf.c @@ -0,0 +1,32 @@ +/* Multiple versions of s_logb. + Copyright (C) 2013 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + 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, see + . */ + +#include +#include +#include +#include "init-arch.h" + +extern __typeof (__logbf) __logbf_ppc32 attribute_hidden; +extern __typeof (__logbf) __logbf_power7 attribute_hidden; + +libc_ifunc (__logbf, + (hwcap & PPC_FEATURE_ARCH_2_06) + ? __logbf_power7 + : __logbf_ppc32); + +weak_alias (__logbf, logbf) diff --git a/sysdeps/powerpc/powerpc32/fpu/multiarch/s_logbl-c.c b/sysdeps/powerpc/powerpc32/fpu/multiarch/s_logbl-c.c new file mode 100644 index 0000000000..1fc965b893 --- /dev/null +++ b/sysdeps/powerpc/powerpc32/fpu/multiarch/s_logbl-c.c @@ -0,0 +1,7 @@ +#include +#include +#include + +#define __logbl __logbl_ppc32 + +#include diff --git a/sysdeps/powerpc/powerpc32/fpu/multiarch/s_logbl-power7.c b/sysdeps/powerpc/powerpc32/fpu/multiarch/s_logbl-power7.c new file mode 100644 index 0000000000..e783b46c47 --- /dev/null +++ b/sysdeps/powerpc/powerpc32/fpu/multiarch/s_logbl-power7.c @@ -0,0 +1,70 @@ +/* logbl(). PowerPC/POWER7 version. + Copyright (C) 2012-2013 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + 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, see + . */ + +#include +#include +#include + +__typeof (__logbl) __logbl_power7 __attribute__ ((__target__ ("cpu=power7"))); + +/* This implementation avoids FP to INT conversions by using VSX + bitwise instructions over FP values. */ + +static const double two1div52 = 2.220446049250313e-16; /* 1/2**52 */ +static const double two10m1 = -1023.0; /* 2**10 -1 */ + +/* FP mask to extract the exponent. */ +static const union { + unsigned long long mask; + double d; +} mask = { 0x7ff0000000000000ULL }; + +long double +__logbl_power7 (long double x) +{ + double xh, xl; + double ret; + + if (__builtin_expect (x == 0.0L, 0)) + /* Raise FE_DIVBYZERO and return -HUGE_VAL[LF]. */ + return -1.0L / __builtin_fabsl (x); + + ldbl_unpack (x, &xh, &xl); + /* ret = x & 0x7ff0000000000000; */ + asm ( + "xxland %x0,%x1,%x2\n" + "fcfid %0,%0" + : "=f" (ret) + : "f" (xh), "f" (mask.d)); + /* ret = (ret >> 52) - 1023.0; */ + ret = (ret * two1div52) + two10m1; + if (__builtin_expect (ret > -two10m1, 0)) + /* Multiplication is used to set logb (+-INF) = INF. */ + return (xh * xh); + else if (__builtin_expect (ret == two10m1, 0)) + { + /* POSIX specifies that denormal number is treated as + though it were normalized. */ + int64_t lx, hx; + + GET_LDOUBLE_WORDS64 (hx, lx, x); + return (long double) (-1023 - (__builtin_clzll (hx) - 12)); + } + /* Test to avoid logb_downward (0.0) == -0.0. */ + return ret == -0.0 ? 0.0 : ret; +} diff --git a/sysdeps/powerpc/powerpc32/fpu/multiarch/s_logbl.c b/sysdeps/powerpc/powerpc32/fpu/multiarch/s_logbl.c new file mode 100644 index 0000000000..8703da5ded --- /dev/null +++ b/sysdeps/powerpc/powerpc32/fpu/multiarch/s_logbl.c @@ -0,0 +1,32 @@ +/* Multiple versions of s_finite. + Copyright (C) 2013 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + 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, see + . */ + +#include +#include +#include +#include "init-arch.h" + +extern __typeof (__logbl) __logbl_ppc32 attribute_hidden; +extern __typeof (__logbl) __logbl_power7 attribute_hidden; + +libc_ifunc (__logbl, + (hwcap & PPC_FEATURE_ARCH_2_06) + ? __logbl_power7 + : __logbl_ppc32); + +long_double_symbol (libm, __logbl, logbl); diff --git a/sysdeps/powerpc/powerpc32/power7/fpu/s_logb.c b/sysdeps/powerpc/powerpc32/power7/fpu/s_logb.c deleted file mode 100644 index da2e6b9e49..0000000000 --- a/sysdeps/powerpc/powerpc32/power7/fpu/s_logb.c +++ /dev/null @@ -1,78 +0,0 @@ -/* logb(). PowerPC/POWER7 version. - Copyright (C) 2012-2013 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - 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, see - . */ - -#include - -/* This implementation avoids FP to INT conversions by using VSX - bitwise instructions over FP values. */ - -static const double two1div52 = 2.220446049250313e-16; /* 1/2**52 */ -static const double two10m1 = -1023.0; /* 2**10 -1 */ - -/* FP mask to extract the exponent. */ -static const union { - unsigned long long mask; - double d; -} mask = { 0x7ff0000000000000ULL }; - -double -__logb (double x) -{ - double ret; - - if (__builtin_expect (x == 0.0, 0)) - /* Raise FE_DIVBYZERO and return -HUGE_VAL[LF]. */ - return -1.0 / __builtin_fabs (x); - - /* ret = x & 0x7ff0000000000000; */ - asm ( - "xxland %x0,%x1,%x2\n" - "fcfid %0,%0" - : "=f" (ret) - : "f" (x), "f" (mask.d)); - /* ret = (ret >> 52) - 1023.0; */ - ret = (ret * two1div52) + two10m1; - if (__builtin_expect (ret > -two10m1, 0)) - /* Multiplication is used to set logb (+-INF) = INF. */ - return (x * x); - else if (__builtin_expect (ret == two10m1, 0)) - { - /* POSIX specifies that denormal numbers are treated as - though they were normalized. */ - int32_t lx, ix; - int ma; - - EXTRACT_WORDS (ix, lx, x); - if (ix == 0) - ma = __builtin_clz (lx) + 32; - else - ma = __builtin_clz (ix); - return (double) (-1023 - (ma - 12)); - } - /* Test to avoid logb_downward (0.0) == -0.0. */ - return ret == -0.0 ? 0.0 : ret; -} -weak_alias (__logb, logb) -#ifdef NO_LONG_DOUBLE -strong_alias (__logb, __logbl) -weak_alias (__logb, logbl) -#endif - -#if LONG_DOUBLE_COMPAT (libm, GLIBC_2_0) -compat_symbol (libm, logb, logbl, GLIBC_2_0); -#endif diff --git a/sysdeps/powerpc/powerpc32/power7/fpu/s_logbf.c b/sysdeps/powerpc/powerpc32/power7/fpu/s_logbf.c deleted file mode 100644 index 05726f2f7f..0000000000 --- a/sysdeps/powerpc/powerpc32/power7/fpu/s_logbf.c +++ /dev/null @@ -1,60 +0,0 @@ -/* logbf(). PowerPC/POWER7 version. - Copyright (C) 2012-2013 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - 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, see - . */ - -#include "math_private.h" - -/* This implementation avoids FP to INT conversions by using VSX - bitwise instructions over FP values. */ - -static const double two1div52 = 2.220446049250313e-16; /* 1/2**52 */ -static const double two10m1 = -1023.0; /* -2**10 + 1 */ -static const double two7m1 = -127.0; /* -2**7 + 1 */ - -/* FP mask to extract the exponent. */ -static const union { - unsigned long long mask; - double d; -} mask = { 0x7ff0000000000000ULL }; - -float -__logbf (float x) -{ - /* VSX operation are all done internally as double. */ - double ret; - - if (__builtin_expect (x == 0.0, 0)) - /* Raise FE_DIVBYZERO and return -HUGE_VAL[LF]. */ - return -1.0 / __builtin_fabsf (x); - - /* ret = x & 0x7f800000; */ - asm ( - "xxland %x0,%x1,%x2\n" - "fcfid %0,%0" - : "=f"(ret) - : "f" (x), "f" (mask.d)); - /* ret = (ret >> 52) - 1023.0, since ret is double. */ - ret = (ret * two1div52) + two10m1; - if (__builtin_expect (ret > -two7m1, 0)) - /* Multiplication is used to set logb (+-INF) = INF. */ - return (x * x); - /* Since operations are done with double we don't need - additional tests for subnormal numbers. - The test is to avoid logb_downward (0.0) == -0.0. */ - return ret == -0.0 ? 0.0 : ret; -} -weak_alias (__logbf, logbf) diff --git a/sysdeps/powerpc/powerpc32/power7/fpu/s_logbl.c b/sysdeps/powerpc/powerpc32/power7/fpu/s_logbl.c deleted file mode 100644 index e008ed0c3d..0000000000 --- a/sysdeps/powerpc/powerpc32/power7/fpu/s_logbl.c +++ /dev/null @@ -1,70 +0,0 @@ -/* logbl(). PowerPC/POWER7 version. - Copyright (C) 2012-2013 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - 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, see - . */ - -#include -#include -#include - -/* This implementation avoids FP to INT conversions by using VSX - bitwise instructions over FP values. */ - -static const double two1div52 = 2.220446049250313e-16; /* 1/2**52 */ -static const double two10m1 = -1023.0; /* 2**10 -1 */ - -/* FP mask to extract the exponent. */ -static const union { - unsigned long long mask; - double d; -} mask = { 0x7ff0000000000000ULL }; - -long double -__logbl (long double x) -{ - double xh, xl; - double ret; - - if (__builtin_expect (x == 0.0L, 0)) - /* Raise FE_DIVBYZERO and return -HUGE_VAL[LF]. */ - return -1.0L / __builtin_fabsl (x); - - ldbl_unpack (x, &xh, &xl); - /* ret = x & 0x7ff0000000000000; */ - asm ( - "xxland %x0,%x1,%x2\n" - "fcfid %0,%0" - : "=f" (ret) - : "f" (xh), "f" (mask.d)); - /* ret = (ret >> 52) - 1023.0; */ - ret = (ret * two1div52) + two10m1; - if (__builtin_expect (ret > -two10m1, 0)) - /* Multiplication is used to set logb (+-INF) = INF. */ - return (xh * xh); - else if (__builtin_expect (ret == two10m1, 0)) - { - /* POSIX specifies that denormal number is treated as - though it were normalized. */ - int64_t lx, hx; - - GET_LDOUBLE_WORDS64 (hx, lx, x); - return (long double) (-1023 - (__builtin_clzll (hx) - 12)); - } - /* Test to avoid logb_downward (0.0) == -0.0. */ - return ret == -0.0 ? 0.0 : ret; -} - -long_double_symbol (libm, __logbl, logbl); -- cgit 1.4.1