363 lines
9.3 KiB
C
363 lines
9.3 KiB
C
/* Automatic switching between software and hardware IEEE 128-bit
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floating-point emulation for PowerPC.
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Copyright (C) 2016-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Michael Meissner (meissner@linux.vnet.ibm.com)
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Code is based on the main soft-fp library written by:
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Richard Henderson (rth@cygnus.com) and
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Jakub Jelinek (jj@ultra.linux.cz).
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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In addition to the permissions in the GNU Lesser General Public
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License, the Free Software Foundation gives you unlimited
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permission to link the compiled version of this file into
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combinations with other programs, and to distribute those
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combinations without any restriction coming from the use of this
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file. (The Lesser General Public License restrictions do apply in
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other respects; for example, they cover modification of the file,
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and distribution when not linked into a combine executable.)
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <soft-fp.h>
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#include <quad-float128.h>
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#include <string.h>
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#include <stdlib.h>
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#include <ctype.h>
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#ifndef FLOAT128_HW_INSNS
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#error "float128-ifunc.c needs access to ISA 3.0 instructions and ifunc"
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#endif
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#ifdef __FLOAT128_HARDWARE__
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#error "This module must not be compiled with IEEE 128-bit hardware support"
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#endif
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#include <sys/auxv.h>
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/* Use the namespace clean version of getauxval. However, not all versions of
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sys/auxv.h declare it, so declare it here. This code is intended to be
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temporary until a suitable version of __builtin_cpu_supports is added that
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allows us to tell quickly if the machine supports IEEE 128-bit hardware. */
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extern unsigned long __getauxval (unsigned long);
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static int
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have_ieee_hw_p (void)
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{
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static int ieee_hw_p = -1;
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if (ieee_hw_p < 0)
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{
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char *p = (char *) __getauxval (AT_PLATFORM);
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ieee_hw_p = 0;
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/* Don't use atoi/strtol/strncmp/etc. These may require the normal
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environment to be setup to set errno to 0, and the ifunc resolvers run
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before the whole glibc environment is initialized. */
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if (p && p[0] == 'p' && p[1] == 'o' && p[2] == 'w' && p[3] == 'e'
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&& p[4] == 'r')
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{
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long n = 0;
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char ch;
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p += 5;
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while ((ch = *p++) >= '0' && (ch <= '9'))
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n = (n * 10) + (ch - '0');
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if (n >= 9)
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ieee_hw_p = 1;
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}
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}
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return ieee_hw_p;
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}
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#define SW_OR_HW(SW, HW) (have_ieee_hw_p () ? HW : SW)
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/* Resolvers. */
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/* We do not provide ifunc resolvers for __fixkfti, __fixunskfti, __floattikf,
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and __floatuntikf. There is no ISA 3.0 instruction that converts between
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128-bit integer types and 128-bit IEEE floating point, or vice versa. So
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use the emulator functions for these conversions. */
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static void *__addkf3_resolve (void);
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static void *__subkf3_resolve (void);
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static void *__mulkf3_resolve (void);
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static void *__divkf3_resolve (void);
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static void *__negkf2_resolve (void);
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static void *__eqkf2_resolve (void);
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static void *__nekf2_resolve (void);
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static void *__gekf2_resolve (void);
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static void *__gtkf2_resolve (void);
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static void *__lekf2_resolve (void);
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static void *__ltkf2_resolve (void);
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static void *__unordkf2_resolve (void);
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static void *__extendsfkf2_resolve (void);
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static void *__extenddfkf2_resolve (void);
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static void *__trunckfsf2_resolve (void);
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static void *__trunckfdf2_resolve (void);
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static void *__fixkfsi_resolve (void);
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static void *__fixkfdi_resolve (void);
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static void *__fixunskfsi_resolve (void);
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static void *__fixunskfdi_resolve (void);
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static void *__floatsikf_resolve (void);
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static void *__floatdikf_resolve (void);
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static void *__floatunsikf_resolve (void);
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static void *__floatundikf_resolve (void);
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static void *__extendkftf2_resolve (void);
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static void *__trunctfkf2_resolve (void);
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static void *
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__addkf3_resolve (void)
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{
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return (void *) SW_OR_HW (__addkf3_sw, __addkf3_hw);
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}
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static void *
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__subkf3_resolve (void)
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{
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return (void *) SW_OR_HW (__subkf3_sw, __subkf3_hw);
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}
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static void *
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__mulkf3_resolve (void)
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{
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return (void *) SW_OR_HW (__mulkf3_sw, __mulkf3_hw);
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}
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static void *
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__divkf3_resolve (void)
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{
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return (void *) SW_OR_HW (__divkf3_sw, __divkf3_hw);
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}
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static void *
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__negkf2_resolve (void)
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{
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return (void *) SW_OR_HW (__negkf2_sw, __negkf2_hw);
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}
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static void *
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__floatsikf_resolve (void)
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{
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return (void *) SW_OR_HW (__floatsikf_sw, __floatsikf_hw);
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}
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static void *
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__floatdikf_resolve (void)
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{
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return (void *) SW_OR_HW (__floatdikf_sw, __floatdikf_hw);
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}
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static void *
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__floatunsikf_resolve (void)
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{
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return (void *) SW_OR_HW (__floatunsikf_sw, __floatunsikf_hw);
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}
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static void *
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__floatundikf_resolve (void)
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{
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return (void *) SW_OR_HW (__floatundikf_sw, __floatundikf_hw);
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}
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static void *
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__fixkfsi_resolve (void)
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{
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return (void *) SW_OR_HW (__fixkfsi_sw, __fixkfsi_hw);
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}
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static void *
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__fixkfdi_resolve (void)
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{
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return (void *) SW_OR_HW (__fixkfdi_sw, __fixkfdi_hw);
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}
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static void *
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__fixunskfsi_resolve (void)
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{
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return (void *) SW_OR_HW (__fixunskfsi_sw, __fixunskfsi_hw);
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}
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static void *
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__fixunskfdi_resolve (void)
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{
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return (void *) SW_OR_HW (__fixunskfdi_sw, __fixunskfdi_hw);
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}
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static void *
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__extendsfkf2_resolve (void)
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{
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return (void *) SW_OR_HW (__extendsfkf2_sw, __extendsfkf2_hw);
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}
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static void *
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__extenddfkf2_resolve (void)
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{
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return (void *) SW_OR_HW (__extenddfkf2_sw, __extenddfkf2_hw);
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}
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static void *
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__trunckfsf2_resolve (void)
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{
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return (void *) SW_OR_HW (__trunckfsf2_sw, __trunckfsf2_hw);
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}
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static void *
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__trunckfdf2_resolve (void)
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{
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return (void *) SW_OR_HW (__trunckfdf2_sw, __trunckfdf2_hw);
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}
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static void *
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__extendkftf2_resolve (void)
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{
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return (void *) SW_OR_HW (__extendkftf2_sw, __extendkftf2_hw);
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}
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static void *
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__trunctfkf2_resolve (void)
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{
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return (void *) SW_OR_HW (__trunctfkf2_sw, __trunctfkf2_hw);
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}
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static void *
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__eqkf2_resolve (void)
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{
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return (void *) SW_OR_HW (__eqkf2_sw, __eqkf2_hw);
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}
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static void *
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__gekf2_resolve (void)
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{
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return (void *) SW_OR_HW (__gekf2_sw, __gekf2_hw);
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}
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static void *
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__lekf2_resolve (void)
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{
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return (void *) SW_OR_HW (__lekf2_sw, __lekf2_hw);
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}
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static void *
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__unordkf2_resolve (void)
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{
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return (void *) SW_OR_HW (__unordkf2_sw, __unordkf2_hw);
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}
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/* Resolve __nekf2, __gtkf2, __ltkf2 like __eqkf2, __gekf2, and __lekf2, since
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the functions return the same values. */
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static void *
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__nekf2_resolve (void)
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{
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return (void *) SW_OR_HW (__eqkf2_sw, __eqkf2_hw);
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}
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static void *
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__gtkf2_resolve (void)
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{
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return (void *) SW_OR_HW (__gekf2_sw, __gekf2_hw);
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}
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static void *
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__ltkf2_resolve (void)
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{
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return (void *) SW_OR_HW (__lekf2_sw, __lekf2_hw);
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}
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/* Ifunc definitions. */
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TFtype __addkf3 (TFtype, TFtype)
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__attribute__ ((__ifunc__ ("__addkf3_resolve")));
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TFtype __subkf3 (TFtype, TFtype)
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__attribute__ ((__ifunc__ ("__subkf3_resolve")));
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TFtype __mulkf3 (TFtype, TFtype)
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__attribute__ ((__ifunc__ ("__mulkf3_resolve")));
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TFtype __divkf3 (TFtype, TFtype)
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__attribute__ ((__ifunc__ ("__divkf3_resolve")));
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TFtype __negkf2 (TFtype)
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__attribute__ ((__ifunc__ ("__negkf2_resolve")));
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CMPtype __eqkf2 (TFtype, TFtype)
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__attribute__ ((__ifunc__ ("__eqkf2_resolve")));
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CMPtype __nekf2 (TFtype, TFtype)
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__attribute__ ((__ifunc__ ("__nekf2_resolve")));
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CMPtype __gekf2 (TFtype, TFtype)
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__attribute__ ((__ifunc__ ("__gekf2_resolve")));
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CMPtype __gtkf2 (TFtype, TFtype)
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__attribute__ ((__ifunc__ ("__gtkf2_resolve")));
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CMPtype __lekf2 (TFtype, TFtype)
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__attribute__ ((__ifunc__ ("__lekf2_resolve")));
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CMPtype __ltkf2 (TFtype, TFtype)
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__attribute__ ((__ifunc__ ("__ltkf2_resolve")));
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CMPtype __unordkf2 (TFtype, TFtype)
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__attribute__ ((__ifunc__ ("__unordkf2_resolve")));
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TFtype __extendsfkf2 (float)
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__attribute__ ((__ifunc__ ("__extendsfkf2_resolve")));
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TFtype __extenddfkf2 (double)
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__attribute__ ((__ifunc__ ("__extenddfkf2_resolve")));
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float __trunckfsf2 (TFtype)
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__attribute__ ((__ifunc__ ("__trunckfsf2_resolve")));
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double __trunckfdf2 (TFtype)
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__attribute__ ((__ifunc__ ("__trunckfdf2_resolve")));
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SItype_ppc __fixkfsi (TFtype)
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__attribute__ ((__ifunc__ ("__fixkfsi_resolve")));
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DItype_ppc __fixkfdi (TFtype)
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__attribute__ ((__ifunc__ ("__fixkfdi_resolve")));
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USItype_ppc __fixunskfsi (TFtype)
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__attribute__ ((__ifunc__ ("__fixunskfsi_resolve")));
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UDItype_ppc __fixunskfdi (TFtype)
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__attribute__ ((__ifunc__ ("__fixunskfdi_resolve")));
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TFtype __floatsikf (SItype_ppc)
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__attribute__ ((__ifunc__ ("__floatsikf_resolve")));
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TFtype __floatdikf (DItype_ppc)
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__attribute__ ((__ifunc__ ("__floatdikf_resolve")));
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TFtype __floatunsikf (USItype_ppc)
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__attribute__ ((__ifunc__ ("__floatunsikf_resolve")));
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TFtype __floatundikf (UDItype_ppc)
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__attribute__ ((__ifunc__ ("__floatundikf_resolve")));
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IBM128_TYPE __extendkftf2 (TFtype)
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__attribute__ ((__ifunc__ ("__extendkftf2_resolve")));
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TFtype __trunctfkf2 (IBM128_TYPE)
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__attribute__ ((__ifunc__ ("__trunctfkf2_resolve")));
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