diff options
Diffstat (limited to 'arch/parisc/math-emu/fcnvfxt.c')
| -rw-r--r-- | arch/parisc/math-emu/fcnvfxt.c | 328 |
1 files changed, 328 insertions, 0 deletions
diff --git a/arch/parisc/math-emu/fcnvfxt.c b/arch/parisc/math-emu/fcnvfxt.c new file mode 100644 index 0000000..8b9010c --- /dev/null +++ b/arch/parisc/math-emu/fcnvfxt.c @@ -0,0 +1,328 @@ +/* + * Linux/PA-RISC Project (http://www.parisc-linux.org/) + * + * Floating-point emulation code + * Copyright (C) 2001 Hewlett-Packard (Paul Bame) <bame@debian.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2, or (at your option) + * any later version. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ +/* + * BEGIN_DESC + * + * File: + * @(#) pa/spmath/fcnvfxt.c $Revision: 1.1 $ + * + * Purpose: + * Single Floating-point to Single Fixed-point /w truncated result + * Single Floating-point to Double Fixed-point /w truncated result + * Double Floating-point to Single Fixed-point /w truncated result + * Double Floating-point to Double Fixed-point /w truncated result + * + * External Interfaces: + * dbl_to_dbl_fcnvfxt(srcptr,nullptr,dstptr,status) + * dbl_to_sgl_fcnvfxt(srcptr,nullptr,dstptr,status) + * sgl_to_dbl_fcnvfxt(srcptr,nullptr,dstptr,status) + * sgl_to_sgl_fcnvfxt(srcptr,nullptr,dstptr,status) + * + * Internal Interfaces: + * + * Theory: + * <<please update with a overview of the operation of this file>> + * + * END_DESC +*/ + + +#include "float.h" +#include "sgl_float.h" +#include "dbl_float.h" +#include "cnv_float.h" + +/* + * Convert single floating-point to single fixed-point format + * with truncated result + */ +/*ARGSUSED*/ +int +sgl_to_sgl_fcnvfxt( + sgl_floating_point *srcptr, + unsigned int *nullptr, + int *dstptr, + unsigned int *status) +{ + register unsigned int src, temp; + register int src_exponent, result; + + src = *srcptr; + src_exponent = Sgl_exponent(src) - SGL_BIAS; + + /* + * Test for overflow + */ + if (src_exponent > SGL_FX_MAX_EXP) { + /* check for MININT */ + if ((src_exponent > SGL_FX_MAX_EXP + 1) || + Sgl_isnotzero_mantissa(src) || Sgl_iszero_sign(src)) { + if (Sgl_iszero_sign(src)) result = 0x7fffffff; + else result = 0x80000000; + + if (Is_invalidtrap_enabled()) { + return(INVALIDEXCEPTION); + } + Set_invalidflag(); + *dstptr = result; + return(NOEXCEPTION); + } + } + /* + * Generate result + */ + if (src_exponent >= 0) { + temp = src; + Sgl_clear_signexponent_set_hidden(temp); + Int_from_sgl_mantissa(temp,src_exponent); + if (Sgl_isone_sign(src)) result = -Sgl_all(temp); + else result = Sgl_all(temp); + *dstptr = result; + + /* check for inexact */ + if (Sgl_isinexact_to_fix(src,src_exponent)) { + if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION); + else Set_inexactflag(); + } + } + else { + *dstptr = 0; + + /* check for inexact */ + if (Sgl_isnotzero_exponentmantissa(src)) { + if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION); + else Set_inexactflag(); + } + } + return(NOEXCEPTION); +} + +/* + * Single Floating-point to Double Fixed-point + */ +/*ARGSUSED*/ +int +sgl_to_dbl_fcnvfxt( + sgl_floating_point *srcptr, + unsigned int *nullptr, + dbl_integer *dstptr, + unsigned int *status) +{ + register int src_exponent, resultp1; + register unsigned int src, temp, resultp2; + + src = *srcptr; + src_exponent = Sgl_exponent(src) - SGL_BIAS; + + /* + * Test for overflow + */ + if (src_exponent > DBL_FX_MAX_EXP) { + /* check for MININT */ + if ((src_exponent > DBL_FX_MAX_EXP + 1) || + Sgl_isnotzero_mantissa(src) || Sgl_iszero_sign(src)) { + if (Sgl_iszero_sign(src)) { + resultp1 = 0x7fffffff; + resultp2 = 0xffffffff; + } + else { + resultp1 = 0x80000000; + resultp2 = 0; + } + if (Is_invalidtrap_enabled()) { + return(INVALIDEXCEPTION); + } + Set_invalidflag(); + Dint_copytoptr(resultp1,resultp2,dstptr); + return(NOEXCEPTION); + } + Dint_set_minint(resultp1,resultp2); + Dint_copytoptr(resultp1,resultp2,dstptr); + return(NOEXCEPTION); + } + /* + * Generate result + */ + if (src_exponent >= 0) { + temp = src; + Sgl_clear_signexponent_set_hidden(temp); + Dint_from_sgl_mantissa(temp,src_exponent,resultp1,resultp2); + if (Sgl_isone_sign(src)) { + Dint_setone_sign(resultp1,resultp2); + } + Dint_copytoptr(resultp1,resultp2,dstptr); + + /* check for inexact */ + if (Sgl_isinexact_to_fix(src,src_exponent)) { + if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION); + else Set_inexactflag(); + } + } + else { + Dint_setzero(resultp1,resultp2); + Dint_copytoptr(resultp1,resultp2,dstptr); + + /* check for inexact */ + if (Sgl_isnotzero_exponentmantissa(src)) { + if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION); + else Set_inexactflag(); + } + } + return(NOEXCEPTION); +} + +/* + * Double Floating-point to Single Fixed-point + */ +/*ARGSUSED*/ +int +dbl_to_sgl_fcnvfxt( + dbl_floating_point *srcptr, + unsigned int *nullptr, + int *dstptr, + unsigned int *status) +{ + register unsigned int srcp1, srcp2, tempp1, tempp2; + register int src_exponent, result; + + Dbl_copyfromptr(srcptr,srcp1,srcp2); + src_exponent = Dbl_exponent(srcp1) - DBL_BIAS; + + /* + * Test for overflow + */ + if (src_exponent > SGL_FX_MAX_EXP) { + /* check for MININT */ + if (Dbl_isoverflow_to_int(src_exponent,srcp1,srcp2)) { + if (Dbl_iszero_sign(srcp1)) result = 0x7fffffff; + else result = 0x80000000; + + if (Is_invalidtrap_enabled()) { + return(INVALIDEXCEPTION); + } + Set_invalidflag(); + *dstptr = result; + return(NOEXCEPTION); + } + } + /* + * Generate result + */ + if (src_exponent >= 0) { + tempp1 = srcp1; + tempp2 = srcp2; + Dbl_clear_signexponent_set_hidden(tempp1); + Int_from_dbl_mantissa(tempp1,tempp2,src_exponent); + if (Dbl_isone_sign(srcp1) && (src_exponent <= SGL_FX_MAX_EXP)) + result = -Dbl_allp1(tempp1); + else result = Dbl_allp1(tempp1); + *dstptr = result; + + /* check for inexact */ + if (Dbl_isinexact_to_fix(srcp1,srcp2,src_exponent)) { + if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION); + else Set_inexactflag(); + } + } + else { + *dstptr = 0; + + /* check for inexact */ + if (Dbl_isnotzero_exponentmantissa(srcp1,srcp2)) { + if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION); + else Set_inexactflag(); + } + } + return(NOEXCEPTION); +} + +/* + * Double Floating-point to Double Fixed-point + */ +/*ARGSUSED*/ +int +dbl_to_dbl_fcnvfxt( + dbl_floating_point *srcptr, + unsigned int *nullptr, + dbl_integer *dstptr, + unsigned int *status) +{ + register int src_exponent, resultp1; + register unsigned int srcp1, srcp2, tempp1, tempp2, resultp2; + + Dbl_copyfromptr(srcptr,srcp1,srcp2); + src_exponent = Dbl_exponent(srcp1) - DBL_BIAS; + + /* + * Test for overflow + */ + if (src_exponent > DBL_FX_MAX_EXP) { + /* check for MININT */ + if ((src_exponent > DBL_FX_MAX_EXP + 1) || + Dbl_isnotzero_mantissa(srcp1,srcp2) || Dbl_iszero_sign(srcp1)) { + if (Dbl_iszero_sign(srcp1)) { + resultp1 = 0x7fffffff; + resultp2 = 0xffffffff; + } + else { + resultp1 = 0x80000000; + resultp2 = 0; + } + if (Is_invalidtrap_enabled()) { + return(INVALIDEXCEPTION); + } + Set_invalidflag(); + Dint_copytoptr(resultp1,resultp2,dstptr); + return(NOEXCEPTION); + } + } + /* + * Generate result + */ + if (src_exponent >= 0) { + tempp1 = srcp1; + tempp2 = srcp2; + Dbl_clear_signexponent_set_hidden(tempp1); + Dint_from_dbl_mantissa(tempp1,tempp2,src_exponent, + resultp1,resultp2); + if (Dbl_isone_sign(srcp1)) { + Dint_setone_sign(resultp1,resultp2); + } + Dint_copytoptr(resultp1,resultp2,dstptr); + + /* check for inexact */ + if (Dbl_isinexact_to_fix(srcp1,srcp2,src_exponent)) { + if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION); + else Set_inexactflag(); + } + } + else { + Dint_setzero(resultp1,resultp2); + Dint_copytoptr(resultp1,resultp2,dstptr); + + /* check for inexact */ + if (Dbl_isnotzero_exponentmantissa(srcp1,srcp2)) { + if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION); + else Set_inexactflag(); + } + } + return(NOEXCEPTION); +} |
