From f8e8b8ed9f266097b42a77359445372d82365916 Mon Sep 17 00:00:00 2001 From: Joseph Myers Date: Wed, 19 Oct 2016 01:49:09 +0000 Subject: Add getpayload, getpayloadf, getpayloadl. TS 18661-1 defines functions for manipulating the payloads of NaNs. This patch implements the getpayload functions for glibc; these extract the NaN payload (from an argument passed as a pointer, for which corresponding libm-test support is added) and return it in the same floating-point type. The return value of these functions is unspecified for non-NaN arguments; the patch does the simplest thing to implement, which is that the functions do not check whether the argument is a NaN and just treat the relevant bits of the representation as a payload regardless. A conversion from integer to floating-point is used to produce the required return value, except in the ldbl-128 case; as 128-bit integers are not supported for all configurations using ldbl-128, the code constructs the required floating-point representation of the return value directly instead. Tested for x86_64, x86, mips64 and powerpc. * math/bits/mathcalls.h [__GLIBC_USE (IEC_60559_BFP_EXT)] (getpayload): New declaration. * math/Versions (getpayload): New libm symbol at version GLIBC_2.25. (getpayloadf): Likewise. (getpayloadl): Likewise. * math/Makefile (libm-calls): Add s_getpayloadF. * math/libm-test.inc: Include . (struct test_f_f_data): Add comment. (RUN_TEST_fp_f): New macro. (RUN_TEST_LOOP_fp_f): Likewise. (getpayload_test_data): New array. (getpayload_test): New function. (main): Call getpayload_test. * math/gen-libm-test.pl (parse_args): Handle 'p' in argument descriptor. * manual/arith.texi (FP Bit Twiddling): Document getpayload, getpayloadf and getpayloadl. * manual/libm-err-tab.pl: Update comment on interfaces without ulps tabulated. * sysdeps/ieee754/dbl-64/s_getpayload.c: New file. * sysdeps/ieee754/dbl-64/wordsize-64/s_getpayload.c: Likewise. * sysdeps/ieee754/flt-32/s_getpayloadf.c: Likewise. * sysdeps/ieee754/ldbl-128/s_getpayloadl.c: Likewise. * sysdeps/ieee754/ldbl-128ibm/s_getpayloadl.c: Likewise. * sysdeps/ieee754/ldbl-96/s_getpayloadl.c: Likewise. * 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-96/s_getpayloadl.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) create mode 100644 sysdeps/ieee754/ldbl-96/s_getpayloadl.c (limited to 'sysdeps/ieee754/ldbl-96/s_getpayloadl.c') diff --git a/sysdeps/ieee754/ldbl-96/s_getpayloadl.c b/sysdeps/ieee754/ldbl-96/s_getpayloadl.c new file mode 100644 index 0000000000..3ef90d07de --- /dev/null +++ b/sysdeps/ieee754/ldbl-96/s_getpayloadl.c @@ -0,0 +1,32 @@ +/* Get NaN payload. ldbl-96 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 + +long double +getpayloadl (const long double *x) +{ + uint16_t se __attribute__ ((unused)); + uint32_t hx, lx; + GET_LDOUBLE_WORDS (se, hx, lx, *x); + hx &= 0x3fffffff; + uint64_t ix = ((uint64_t) hx << 32) | lx; + return (long double) ix; +} -- cgit 1.4.1