231 lines
8.9 KiB
C
231 lines
8.9 KiB
C
/* Software floating-point emulation.
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Definitions for IEEE Quad Precision on the PowerPC.
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Copyright (C) 2016-2020 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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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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/* quad.h defines the TFtype type by:
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typedef float TFtype __attribute__ ((mode (TF)));
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This define forces it to use KFmode (aka, ieee 128-bit floating point).
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However, when the compiler's default is changed so that long double is IEEE
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128-bit floating point, we need to go back to using TFmode and TCmode. */
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#ifndef __LONG_DOUBLE_IEEE128__
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#define TF KF
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/* We also need TCtype to represent complex ieee 128-bit float for
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__mulkc3 and __divkc3. */
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typedef __complex float TCtype __attribute__ ((mode (KC)));
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#else
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typedef __complex float TCtype __attribute__ ((mode (TC)));
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#endif
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/* Force the use of the VSX instruction set. */
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#if defined(_ARCH_PPC) && (!defined(__VSX__) || !defined(__FLOAT128__))
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#pragma GCC target ("vsx,float128")
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#endif
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#include <quad.h>
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#define IBM128_TYPE __ibm128
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/* Add prototypes of the library functions created. In case the appropriate
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int/long types are not declared in scope by the time quad.h is included,
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provide our own version. */
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typedef int SItype_ppc __attribute__ ((__mode__ (__SI__)));
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typedef int DItype_ppc __attribute__ ((__mode__ (__DI__)));
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typedef unsigned USItype_ppc __attribute__ ((__mode__ (__SI__)));
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typedef unsigned UDItype_ppc __attribute__ ((__mode__ (__DI__)));
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#ifdef _ARCH_PPC64
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typedef int TItype_ppc __attribute__ ((__mode__ (__TI__)));
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typedef unsigned UTItype_ppc __attribute__ ((__mode__ (__TI__)));
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#endif
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/* Software emulation functions. */
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extern TFtype __addkf3_sw (TFtype, TFtype);
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extern TFtype __subkf3_sw (TFtype, TFtype);
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extern TFtype __mulkf3_sw (TFtype, TFtype);
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extern TFtype __divkf3_sw (TFtype, TFtype);
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extern TFtype __negkf2_sw (TFtype);
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extern TFtype __powikf2_sw (TFtype, SItype_ppc);
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extern CMPtype __eqkf2_sw (TFtype, TFtype);
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extern CMPtype __gekf2_sw (TFtype, TFtype);
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extern CMPtype __lekf2_sw (TFtype, TFtype);
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extern CMPtype __unordkf2_sw (TFtype, TFtype);
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extern TFtype __extendsfkf2_sw (float);
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extern TFtype __extenddfkf2_sw (double);
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extern float __trunckfsf2_sw (TFtype);
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extern double __trunckfdf2_sw (TFtype);
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extern SItype_ppc __fixkfsi_sw (TFtype);
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extern DItype_ppc __fixkfdi_sw (TFtype);
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extern USItype_ppc __fixunskfsi_sw (TFtype);
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extern UDItype_ppc __fixunskfdi_sw (TFtype);
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extern TFtype __floatsikf_sw (SItype_ppc);
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extern TFtype __floatdikf_sw (DItype_ppc);
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extern TFtype __floatunsikf_sw (USItype_ppc);
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extern TFtype __floatundikf_sw (UDItype_ppc);
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extern IBM128_TYPE __extendkftf2_sw (TFtype);
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extern TFtype __trunctfkf2_sw (IBM128_TYPE);
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extern TCtype __mulkc3_sw (TFtype, TFtype, TFtype, TFtype);
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extern TCtype __divkc3_sw (TFtype, TFtype, TFtype, TFtype);
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#ifdef _ARCH_PPC64
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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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extern TItype_ppc __fixkfti (TFtype);
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extern UTItype_ppc __fixunskfti (TFtype);
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extern TFtype __floattikf (TItype_ppc);
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extern TFtype __floatuntikf (UTItype_ppc);
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#endif
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/* Functions using the ISA 3.0 hardware support. If the code is compiled with
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-mcpu=power9, it will not use these functions, but if it was compiled with
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-mcpu=power7 or -mcpu=power8 and run on a ISA 3.0 system, it will use the
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hardware instruction. */
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extern TFtype __addkf3_hw (TFtype, TFtype);
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extern TFtype __subkf3_hw (TFtype, TFtype);
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extern TFtype __mulkf3_hw (TFtype, TFtype);
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extern TFtype __divkf3_hw (TFtype, TFtype);
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extern TFtype __negkf2_hw (TFtype);
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extern TFtype __powikf2_hw (TFtype, SItype_ppc);
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extern CMPtype __eqkf2_hw (TFtype, TFtype);
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extern CMPtype __gekf2_hw (TFtype, TFtype);
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extern CMPtype __lekf2_hw (TFtype, TFtype);
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extern CMPtype __unordkf2_hw (TFtype, TFtype);
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extern TFtype __extendsfkf2_hw (float);
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extern TFtype __extenddfkf2_hw (double);
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extern float __trunckfsf2_hw (TFtype);
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extern double __trunckfdf2_hw (TFtype);
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extern SItype_ppc __fixkfsi_hw (TFtype);
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extern DItype_ppc __fixkfdi_hw (TFtype);
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extern USItype_ppc __fixunskfsi_hw (TFtype);
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extern UDItype_ppc __fixunskfdi_hw (TFtype);
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extern TFtype __floatsikf_hw (SItype_ppc);
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extern TFtype __floatdikf_hw (DItype_ppc);
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extern TFtype __floatunsikf_hw (USItype_ppc);
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extern TFtype __floatundikf_hw (UDItype_ppc);
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extern IBM128_TYPE __extendkftf2_hw (TFtype);
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extern TFtype __trunctfkf2_hw (IBM128_TYPE);
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extern TCtype __mulkc3_hw (TFtype, TFtype, TFtype, TFtype);
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extern TCtype __divkc3_hw (TFtype, TFtype, TFtype, TFtype);
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/* Ifunc function declarations, to automatically switch between software
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emulation and hardware support. */
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extern TFtype __addkf3 (TFtype, TFtype);
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extern TFtype __subkf3 (TFtype, TFtype);
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extern TFtype __mulkf3 (TFtype, TFtype);
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extern TFtype __divkf3 (TFtype, TFtype);
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extern TFtype __negkf2 (TFtype);
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extern TFtype __powikf2 (TFtype, SItype_ppc);
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extern CMPtype __eqkf2 (TFtype, TFtype);
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extern CMPtype __nekf2 (TFtype, TFtype);
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extern CMPtype __gekf2 (TFtype, TFtype);
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extern CMPtype __gtkf2 (TFtype, TFtype);
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extern CMPtype __lekf2 (TFtype, TFtype);
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extern CMPtype __ltkf2 (TFtype, TFtype);
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extern CMPtype __unordkf2 (TFtype, TFtype);
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extern TFtype __extendsfkf2 (float);
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extern TFtype __extenddfkf2 (double);
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extern float __trunckfsf2 (TFtype);
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extern double __trunckfdf2 (TFtype);
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extern SItype_ppc __fixkfsi (TFtype);
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extern DItype_ppc __fixkfdi (TFtype);
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extern USItype_ppc __fixunskfsi (TFtype);
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extern UDItype_ppc __fixunskfdi (TFtype);
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extern TFtype __floatsikf (SItype_ppc);
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extern TFtype __floatdikf (DItype_ppc);
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extern TFtype __floatunsikf (USItype_ppc);
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extern TFtype __floatundikf (UDItype_ppc);
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extern IBM128_TYPE __extendkftf2 (TFtype);
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extern TFtype __trunctfkf2 (IBM128_TYPE);
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/* Complex __float128 built on __float128 interfaces. */
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extern TCtype __mulkc3 (TFtype, TFtype, TFtype, TFtype);
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extern TCtype __divkc3 (TFtype, TFtype, TFtype, TFtype);
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/* Implementation of conversions between __ibm128 and __float128, to allow the
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same code to be used on systems with IEEE 128-bit emulation and with IEEE
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128-bit hardware support. */
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union ibm128_union {
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IBM128_TYPE ibm128;
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double dbl[2];
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};
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#define CVT_FLOAT128_TO_IBM128(RESULT, VALUE) \
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{ \
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double __high, __low; \
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TFtype __value = (VALUE); \
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union ibm128_union u; \
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\
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__high = (double) __value; \
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if (__builtin_isnan (__high) || __builtin_isinf (__high)) \
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__low = 0.0; \
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\
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else \
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{ \
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double __high_temp; \
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\
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__low = (double) (__value - (TFtype) __high); \
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/* Renormalize low/high and move them into canonical IBM long \
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double form. */ \
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__high_temp = __high + __low; \
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__low = (__high - __high_temp) + __low; \
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__high = __high_temp; \
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} \
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\
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u.dbl[0] = __high; \
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u.dbl[1] = __low; \
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RESULT = u.ibm128; \
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}
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#define CVT_IBM128_TO_FLOAT128(RESULT, VALUE) \
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{ \
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union ibm128_union u; \
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double __high, __low; \
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\
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u.ibm128 = (VALUE); \
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__high = u.dbl[0]; \
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__low = u.dbl[1]; \
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\
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/* Handle the special cases of NAN and infinity. */ \
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if (__builtin_isnan (__high) || __builtin_isinf (__high)) \
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RESULT = (TFtype) __high; \
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\
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/* If low is 0.0, there no need to do the add. In addition, \
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avoiding the add produces the correct sign if high is -0.0. */ \
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else if (__low == 0.0) \
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RESULT = (TFtype) __high; \
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\
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else \
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RESULT = ((TFtype) __high) + ((TFtype) __low); \
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}
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