From eb3c12c78420ce51778ab36ab1d4b37dcdaf7bd0 Mon Sep 17 00:00:00 2001 From: Joseph Myers Date: Sat, 19 Nov 2016 00:16:28 +0000 Subject: Add setpayload, setpayloadf, setpayloadl. TS 18661-1 defines functions for manipulating the payloads of NaNs. This patch implements the setpayload functions for glibc; these set a number (pointed to by a function argument) to a quiet NaN with the given payload, or to +0 if the given payload is not valid. The implementations are structured to allow the substance of the implementation to be shared with the setpayloadsig functions when those are added. The semantics in the TS are not entirely clear in the case where the payload passed to the function is zero (see discussion on the WG14 reflector last month). This patch implements what seems the most sensible interpretation, that -0 is never valid to give as the payload, but +0 is valid in the case where the kind of NaN being generated has its high mantissa bit set so payload 0 is actually possible in such a NaN. Tested for x86_64, x86, mips64 and powerpc. * math/bits/mathcalls.h [__GLIBC_USE (IEC_60559_BFP_EXT)] (setpayload): New declaration. * math/Versions (setpayload): New libm symbol at version GLIBC_2.25. (setpayloadf): Likewise. (setpayloadl): Likewise. * math/Makefile (libm-calls): Add s_setpayloadF. * math/libm-test.inc (struct test_Ffp_b1_data): Rename to struct test_Ff_b1_data. (RUN_TEST_Ff_b1): New macro. (RUN_TEST_LOOP_Ff_b1): Likewise. (canonicalize_test_data): Update type. (setpayload_test_data): New array. (setpayload_test): New function. (main): Call setpayload_test. * manual/arith.texi (FP Bit Twiddling): Document setpayload, setpayloadf and setpayloadl. * manual/libm-err-tab.pl: Update comment on interfaces without ulps tabulated. * sysdeps/ieee754/dbl-64/s_setpayload.c: New file. * sysdeps/ieee754/dbl-64/s_setpayload_main.c: Likewise. * sysdeps/ieee754/dbl-64/wordsize-64/s_setpayload_main.c: Likewise. * sysdeps/ieee754/flt-32/s_setpayloadf.c: Likewise. * sysdeps/ieee754/flt-32/s_setpayloadf_main.c: Likewise. * sysdeps/ieee754/ldbl-128/s_setpayloadl.c: Likewise. * sysdeps/ieee754/ldbl-128/s_setpayloadl_main.c: Likewise. * sysdeps/ieee754/ldbl-128ibm/s_setpayloadl.c: Likewise. * sysdeps/ieee754/ldbl-128ibm/s_setpayloadl_main.c: Likewise. * sysdeps/ieee754/ldbl-96/s_setpayloadl.c: Likewise. * sysdeps/ieee754/ldbl-96/s_setpayloadl_main.c: Likewise. * sysdeps/ieee754/ldbl-opt/nldbl-setpayload.c: Likewise. * sysdeps/ieee754/ldbl-opt/Makefile (libnldbl-calls): Add setpayload. (CFLAGS-nldbl-setpayload.c): New variable. * sysdeps/nacl/libm.abilist: Update. * sysdeps/unix/sysv/linux/aarch64/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/alpha/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/arm/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/hppa/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/i386/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/ia64/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/m68k/coldfire/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/m68k/m680x0/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/microblaze/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/mips/mips32/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/mips/mips64/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/nios2/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc64/libm-le.abilist: Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc64/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/s390/s390-32/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/s390/s390-64/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/sh/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/sparc/sparc32/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/sparc/sparc64/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/tile/tilepro/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/x86_64/64/libm.abilist: Likewise. * sysdeps/unix/sysv/linux/x86_64/x32/libm.abilist: Likewise. --- sysdeps/ieee754/ldbl-128ibm/s_setpayloadl.c | 3 ++ sysdeps/ieee754/ldbl-128ibm/s_setpayloadl_main.c | 60 ++++++++++++++++++++++++ 2 files changed, 63 insertions(+) create mode 100644 sysdeps/ieee754/ldbl-128ibm/s_setpayloadl.c create mode 100644 sysdeps/ieee754/ldbl-128ibm/s_setpayloadl_main.c (limited to 'sysdeps/ieee754/ldbl-128ibm') diff --git a/sysdeps/ieee754/ldbl-128ibm/s_setpayloadl.c b/sysdeps/ieee754/ldbl-128ibm/s_setpayloadl.c new file mode 100644 index 0000000..1aba33e --- /dev/null +++ b/sysdeps/ieee754/ldbl-128ibm/s_setpayloadl.c @@ -0,0 +1,3 @@ +#define SIG 0 +#define FUNC setpayloadl +#include diff --git a/sysdeps/ieee754/ldbl-128ibm/s_setpayloadl_main.c b/sysdeps/ieee754/ldbl-128ibm/s_setpayloadl_main.c new file mode 100644 index 0000000..278306f --- /dev/null +++ b/sysdeps/ieee754/ldbl-128ibm/s_setpayloadl_main.c @@ -0,0 +1,60 @@ +/* Set NaN payload. ldbl-128ibm version. + Copyright (C) 2016 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 + +#define SET_HIGH_BIT (HIGH_ORDER_BIT_IS_SET_FOR_SNAN ? SIG : !SIG) +#define BIAS 0x3ff +#define PAYLOAD_DIG 51 +#define EXPLICIT_MANT_DIG 52 + +int +FUNC (long double *x, long double payload) +{ + double hi, lo; + uint64_t hx, lx; + + ldbl_unpack (payload, &hi, &lo); + EXTRACT_WORDS64 (hx, hi); + EXTRACT_WORDS64 (lx, lo); + int exponent = hx >> EXPLICIT_MANT_DIG; + /* Test if argument is (a) negative or too large; (b) too small, + except for 0 when allowed; (c) not an integer. All valid + arguments have the low part zero. */ + if ((lx & 0x7fffffffffffffffULL) != 0 + || exponent >= BIAS + PAYLOAD_DIG + || (exponent < BIAS && !(SET_HIGH_BIT && hx == 0)) + || (hx & ((1ULL << (BIAS + EXPLICIT_MANT_DIG - exponent)) - 1)) != 0) + { + *x = 0.0L; + return 1; + } + if (hx != 0) + { + hx &= (1ULL << EXPLICIT_MANT_DIG) - 1; + hx |= 1ULL << EXPLICIT_MANT_DIG; + hx >>= BIAS + EXPLICIT_MANT_DIG - exponent; + } + hx |= 0x7ff0000000000000ULL | (SET_HIGH_BIT ? 0x8000000000000ULL : 0); + INSERT_WORDS64 (hi, hx); + *x = ldbl_pack (hi, 0.0); + return 0; +} -- cgit v1.1