/**************************************************************************** * libs/libm/newlib/include/ieeefp.h * * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. The * ASF licenses this file to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance with the * License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations * under the License. * ****************************************************************************/ #ifndef _IEEE_FP_H_ #define _IEEE_FP_H_ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #ifdef __cplusplus extern "C" { #endif /* FIXME FIXME FIXME: * Neither of __ieee_{float,double}_shape_type seem to be used anywhere * except in libm/test. If that is the case, please delete these from here. * If that is not the case, please insert documentation here describing why * they're needed. */ #ifdef __IEEE_BIG_ENDIAN typedef union { double value; struct { unsigned int sign : 1; unsigned int exponent: 11; unsigned int fraction0:4; unsigned int fraction1:16; unsigned int fraction2:16; unsigned int fraction3:16; } number; struct { unsigned int sign : 1; unsigned int exponent: 11; unsigned int quiet:1; unsigned int function0:3; unsigned int function1:16; unsigned int function2:16; unsigned int function3:16; } nan; struct { unsigned long msw; unsigned long lsw; } parts; long aslong[2]; } __ieee_double_shape_type; #elif defined __IEEE_LITTLE_ENDIAN typedef union { double value; struct { #ifdef __SMALL_BITFIELDS unsigned int fraction3:16; unsigned int fraction2:16; unsigned int fraction1:16; unsigned int fraction0: 4; #else unsigned int fraction1:32; unsigned int fraction0:20; #endif unsigned int exponent :11; unsigned int sign : 1; } number; struct { #ifdef __SMALL_BITFIELDS unsigned int function3:16; unsigned int function2:16; unsigned int function1:16; unsigned int function0:3; #else unsigned int function1:32; unsigned int function0:19; #endif unsigned int quiet:1; unsigned int exponent: 11; unsigned int sign : 1; } nan; struct { unsigned long lsw; unsigned long msw; } parts; long aslong[2]; } __ieee_double_shape_type; #endif /* __IEEE_LITTLE_ENDIAN */ #ifdef __IEEE_BIG_ENDIAN typedef union { float value; struct { unsigned int sign : 1; unsigned int exponent: 8; unsigned int fraction0: 7; unsigned int fraction1: 16; } number; struct { unsigned int sign:1; unsigned int exponent:8; unsigned int quiet:1; unsigned int function0:6; unsigned int function1:16; } nan; long p1; } __ieee_float_shape_type; #elif defined __IEEE_LITTLE_ENDIAN typedef union { float value; struct { unsigned int fraction0: 7; unsigned int fraction1: 16; unsigned int exponent: 8; unsigned int sign : 1; } number; struct { unsigned int function1:16; unsigned int function0:6; unsigned int quiet:1; unsigned int exponent:8; unsigned int sign:1; } nan; long p1; } __ieee_float_shape_type; #endif /* __IEEE_LITTLE_ENDIAN */ #ifndef _LDBL_EQ_DBL #ifndef LDBL_MANT_DIG #error "LDBL_MANT_DIG not defined - should be found in float.h" #elif LDBL_MANT_DIG == DBL_MANT_DIG #error "double and long double are the same size but LDBL_EQ_DBL is not defined" #elif LDBL_MANT_DIG == 53 /* This happens when doubles are 32-bits and long doubles are 64-bits. */ #define EXT_EXPBITS 11 #define EXT_FRACHBITS 20 #define EXT_FRACLBITS 32 #define __ieee_ext_field_type unsigned long #elif LDBL_MANT_DIG == 64 #define EXT_EXPBITS 15 #define EXT_FRACHBITS 32 #define EXT_FRACLBITS 32 #define __ieee_ext_field_type unsigned int #elif LDBL_MANT_DIG == 65 #define EXT_EXPBITS 15 #define EXT_FRACHBITS 32 #define EXT_FRACLBITS 32 #define __ieee_ext_field_type unsigned int #elif LDBL_MANT_DIG == 112 #define EXT_EXPBITS 15 #define EXT_FRACHBITS 48 #define EXT_FRACLBITS 64 #define __ieee_ext_field_type unsigned long long #elif LDBL_MANT_DIG == 113 #define EXT_EXPBITS 15 #define EXT_FRACHBITS 48 #define EXT_FRACLBITS 64 #define __ieee_ext_field_type unsigned long long #else #error Unsupported value for LDBL_MANT_DIG #endif #define EXT_EXP_INFNAN ((1 << EXT_EXPBITS) - 1) /* 32767 */ #define EXT_EXP_BIAS ((1 << (EXT_EXPBITS - 1)) - 1) /* 16383 */ #define EXT_FRACBITS (EXT_FRACLBITS + EXT_FRACHBITS) typedef struct ieee_ext { __ieee_ext_field_type ext_fracl : EXT_FRACLBITS; __ieee_ext_field_type ext_frach : EXT_FRACHBITS; __ieee_ext_field_type ext_exp : EXT_EXPBITS; __ieee_ext_field_type ext_sign : 1; } ieee_ext; typedef union ieee_ext_u { long double extu_ld; struct ieee_ext extu_ext; } ieee_ext_u; #endif /* ! _LDBL_EQ_DBL */ /* FLOATING ROUNDING */ typedef int fp_rnd; #define FP_RN 0 /* Round to nearest */ #define FP_RM 1 /* Round down */ #define FP_RP 2 /* Round up */ #define FP_RZ 3 /* Round to zero (trunate) */ fp_rnd fpgetround (void); fp_rnd fpsetround (fp_rnd); /* EXCEPTIONS */ typedef int fp_except; #define FP_X_INV 0x10 /* Invalid operation */ #define FP_X_DX 0x80 /* Divide by zero */ #define FP_X_OFL 0x04 /* Overflow exception */ #define FP_X_UFL 0x02 /* Underflow exception */ #define FP_X_IMP 0x01 /* imprecise exception */ fp_except fpgetmask (void); fp_except fpsetmask (fp_except); fp_except fpgetsticky (void); fp_except fpsetsticky (fp_except); /* INTEGER ROUNDING */ typedef int fp_rdi; #define FP_RDI_TOZ 0 /* Round to Zero */ #define FP_RDI_RD 1 /* Follow float mode */ fp_rdi fpgetroundtoi (void); fp_rdi fpsetroundtoi (fp_rdi); #define __IEEE_DBL_EXPBIAS 1023 #define __IEEE_FLT_EXPBIAS 127 #define __IEEE_DBL_EXPLEN 11 #define __IEEE_FLT_EXPLEN 8 #define __IEEE_DBL_FRACLEN (64 - (__IEEE_DBL_EXPLEN + 1)) #define __IEEE_FLT_FRACLEN (32 - (__IEEE_FLT_EXPLEN + 1)) #define __IEEE_DBL_MAXPOWTWO ((double)(1L << 32 - 2) * (1L << (32-11) - 32 + 1)) #define __IEEE_FLT_MAXPOWTWO ((float)(1L << (32-8) - 1)) #define __IEEE_DBL_NAN_EXP 0x7ff #define __IEEE_FLT_NAN_EXP 0xff #ifdef __ieeefp_isnanf #define isnanf(x) __ieeefp_isnanf(x) #endif #ifdef __ieeefp_isinff #define isinff(x) __ieeefp_isinff(x) #endif #ifdef __ieeefp_finitef #define finitef(x) __ieeefp_finitef(x) #endif #ifdef _DOUBLE_IS_32BITS #undef __IEEE_DBL_EXPBIAS #define __IEEE_DBL_EXPBIAS __IEEE_FLT_EXPBIAS #undef __IEEE_DBL_EXPLEN #define __IEEE_DBL_EXPLEN __IEEE_FLT_EXPLEN #undef __IEEE_DBL_FRACLEN #define __IEEE_DBL_FRACLEN __IEEE_FLT_FRACLEN #undef __IEEE_DBL_MAXPOWTWO #define __IEEE_DBL_MAXPOWTWO __IEEE_FLT_MAXPOWTWO #undef __IEEE_DBL_NAN_EXP #define __IEEE_DBL_NAN_EXP __IEEE_FLT_NAN_EXP #undef __ieee_double_shape_type #define __ieee_double_shape_type __ieee_float_shape_type #endif /* _DOUBLE_IS_32BITS */ #ifdef __cplusplus } #endif #endif /* _IEEE_FP_H_ */