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315 lines
7.8 KiB
315 lines
7.8 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Linux/PA-RISC Project (http://www.parisc-linux.org/) |
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* |
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* Floating-point emulation code |
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* Copyright (C) 2001 Hewlett-Packard (Paul Bame) <[email protected]> |
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*/ |
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/* |
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* BEGIN_DESC |
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* |
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* File: |
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* @(#) pa/spmath/fcnvfxt.c $Revision: 1.1 $ |
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* |
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* Purpose: |
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* Single Floating-point to Single Fixed-point /w truncated result |
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* Single Floating-point to Double Fixed-point /w truncated result |
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* Double Floating-point to Single Fixed-point /w truncated result |
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* Double Floating-point to Double Fixed-point /w truncated result |
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* |
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* External Interfaces: |
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* dbl_to_dbl_fcnvfxt(srcptr,nullptr,dstptr,status) |
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* dbl_to_sgl_fcnvfxt(srcptr,nullptr,dstptr,status) |
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* sgl_to_dbl_fcnvfxt(srcptr,nullptr,dstptr,status) |
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* sgl_to_sgl_fcnvfxt(srcptr,nullptr,dstptr,status) |
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* |
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* Internal Interfaces: |
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* |
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* Theory: |
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* <<please update with a overview of the operation of this file>> |
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* |
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* END_DESC |
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*/ |
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#include "float.h" |
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#include "sgl_float.h" |
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#include "dbl_float.h" |
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#include "cnv_float.h" |
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/* |
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* Convert single floating-point to single fixed-point format |
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* with truncated result |
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*/ |
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/*ARGSUSED*/ |
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int |
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sgl_to_sgl_fcnvfxt( |
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sgl_floating_point *srcptr, |
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unsigned int *nullptr, |
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int *dstptr, |
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unsigned int *status) |
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{ |
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register unsigned int src, temp; |
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register int src_exponent, result; |
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src = *srcptr; |
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src_exponent = Sgl_exponent(src) - SGL_BIAS; |
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/* |
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* Test for overflow |
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*/ |
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if (src_exponent > SGL_FX_MAX_EXP) { |
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/* check for MININT */ |
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if ((src_exponent > SGL_FX_MAX_EXP + 1) || |
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Sgl_isnotzero_mantissa(src) || Sgl_iszero_sign(src)) { |
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if (Sgl_iszero_sign(src)) result = 0x7fffffff; |
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else result = 0x80000000; |
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if (Is_invalidtrap_enabled()) { |
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return(INVALIDEXCEPTION); |
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} |
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Set_invalidflag(); |
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*dstptr = result; |
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return(NOEXCEPTION); |
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} |
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} |
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/* |
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* Generate result |
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*/ |
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if (src_exponent >= 0) { |
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temp = src; |
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Sgl_clear_signexponent_set_hidden(temp); |
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Int_from_sgl_mantissa(temp,src_exponent); |
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if (Sgl_isone_sign(src)) result = -Sgl_all(temp); |
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else result = Sgl_all(temp); |
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*dstptr = result; |
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/* check for inexact */ |
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if (Sgl_isinexact_to_fix(src,src_exponent)) { |
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if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION); |
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else Set_inexactflag(); |
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} |
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} |
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else { |
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*dstptr = 0; |
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/* check for inexact */ |
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if (Sgl_isnotzero_exponentmantissa(src)) { |
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if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION); |
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else Set_inexactflag(); |
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} |
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} |
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return(NOEXCEPTION); |
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} |
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/* |
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* Single Floating-point to Double Fixed-point |
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*/ |
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/*ARGSUSED*/ |
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int |
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sgl_to_dbl_fcnvfxt( |
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sgl_floating_point *srcptr, |
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unsigned int *nullptr, |
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dbl_integer *dstptr, |
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unsigned int *status) |
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{ |
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register int src_exponent, resultp1; |
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register unsigned int src, temp, resultp2; |
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src = *srcptr; |
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src_exponent = Sgl_exponent(src) - SGL_BIAS; |
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/* |
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* Test for overflow |
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*/ |
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if (src_exponent > DBL_FX_MAX_EXP) { |
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/* check for MININT */ |
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if ((src_exponent > DBL_FX_MAX_EXP + 1) || |
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Sgl_isnotzero_mantissa(src) || Sgl_iszero_sign(src)) { |
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if (Sgl_iszero_sign(src)) { |
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resultp1 = 0x7fffffff; |
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resultp2 = 0xffffffff; |
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} |
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else { |
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resultp1 = 0x80000000; |
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resultp2 = 0; |
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} |
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if (Is_invalidtrap_enabled()) { |
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return(INVALIDEXCEPTION); |
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} |
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Set_invalidflag(); |
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Dint_copytoptr(resultp1,resultp2,dstptr); |
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return(NOEXCEPTION); |
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} |
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Dint_set_minint(resultp1,resultp2); |
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Dint_copytoptr(resultp1,resultp2,dstptr); |
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return(NOEXCEPTION); |
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} |
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/* |
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* Generate result |
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*/ |
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if (src_exponent >= 0) { |
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temp = src; |
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Sgl_clear_signexponent_set_hidden(temp); |
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Dint_from_sgl_mantissa(temp,src_exponent,resultp1,resultp2); |
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if (Sgl_isone_sign(src)) { |
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Dint_setone_sign(resultp1,resultp2); |
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} |
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Dint_copytoptr(resultp1,resultp2,dstptr); |
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/* check for inexact */ |
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if (Sgl_isinexact_to_fix(src,src_exponent)) { |
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if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION); |
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else Set_inexactflag(); |
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} |
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} |
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else { |
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Dint_setzero(resultp1,resultp2); |
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Dint_copytoptr(resultp1,resultp2,dstptr); |
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/* check for inexact */ |
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if (Sgl_isnotzero_exponentmantissa(src)) { |
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if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION); |
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else Set_inexactflag(); |
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} |
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} |
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return(NOEXCEPTION); |
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} |
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/* |
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* Double Floating-point to Single Fixed-point |
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*/ |
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/*ARGSUSED*/ |
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int |
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dbl_to_sgl_fcnvfxt( |
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dbl_floating_point *srcptr, |
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unsigned int *nullptr, |
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int *dstptr, |
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unsigned int *status) |
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{ |
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register unsigned int srcp1, srcp2, tempp1, tempp2; |
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register int src_exponent, result; |
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Dbl_copyfromptr(srcptr,srcp1,srcp2); |
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src_exponent = Dbl_exponent(srcp1) - DBL_BIAS; |
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/* |
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* Test for overflow |
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*/ |
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if (src_exponent > SGL_FX_MAX_EXP) { |
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/* check for MININT */ |
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if (Dbl_isoverflow_to_int(src_exponent,srcp1,srcp2)) { |
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if (Dbl_iszero_sign(srcp1)) result = 0x7fffffff; |
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else result = 0x80000000; |
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if (Is_invalidtrap_enabled()) { |
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return(INVALIDEXCEPTION); |
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} |
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Set_invalidflag(); |
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*dstptr = result; |
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return(NOEXCEPTION); |
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} |
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} |
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/* |
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* Generate result |
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*/ |
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if (src_exponent >= 0) { |
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tempp1 = srcp1; |
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tempp2 = srcp2; |
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Dbl_clear_signexponent_set_hidden(tempp1); |
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Int_from_dbl_mantissa(tempp1,tempp2,src_exponent); |
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if (Dbl_isone_sign(srcp1) && (src_exponent <= SGL_FX_MAX_EXP)) |
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result = -Dbl_allp1(tempp1); |
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else result = Dbl_allp1(tempp1); |
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*dstptr = result; |
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/* check for inexact */ |
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if (Dbl_isinexact_to_fix(srcp1,srcp2,src_exponent)) { |
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if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION); |
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else Set_inexactflag(); |
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} |
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} |
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else { |
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*dstptr = 0; |
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/* check for inexact */ |
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if (Dbl_isnotzero_exponentmantissa(srcp1,srcp2)) { |
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if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION); |
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else Set_inexactflag(); |
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} |
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} |
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return(NOEXCEPTION); |
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} |
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/* |
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* Double Floating-point to Double Fixed-point |
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*/ |
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/*ARGSUSED*/ |
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int |
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dbl_to_dbl_fcnvfxt( |
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dbl_floating_point *srcptr, |
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unsigned int *nullptr, |
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dbl_integer *dstptr, |
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unsigned int *status) |
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{ |
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register int src_exponent, resultp1; |
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register unsigned int srcp1, srcp2, tempp1, tempp2, resultp2; |
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Dbl_copyfromptr(srcptr,srcp1,srcp2); |
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src_exponent = Dbl_exponent(srcp1) - DBL_BIAS; |
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/* |
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* Test for overflow |
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*/ |
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if (src_exponent > DBL_FX_MAX_EXP) { |
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/* check for MININT */ |
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if ((src_exponent > DBL_FX_MAX_EXP + 1) || |
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Dbl_isnotzero_mantissa(srcp1,srcp2) || Dbl_iszero_sign(srcp1)) { |
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if (Dbl_iszero_sign(srcp1)) { |
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resultp1 = 0x7fffffff; |
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resultp2 = 0xffffffff; |
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} |
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else { |
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resultp1 = 0x80000000; |
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resultp2 = 0; |
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} |
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if (Is_invalidtrap_enabled()) { |
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return(INVALIDEXCEPTION); |
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} |
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Set_invalidflag(); |
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Dint_copytoptr(resultp1,resultp2,dstptr); |
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return(NOEXCEPTION); |
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} |
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} |
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/* |
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* Generate result |
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*/ |
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if (src_exponent >= 0) { |
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tempp1 = srcp1; |
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tempp2 = srcp2; |
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Dbl_clear_signexponent_set_hidden(tempp1); |
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Dint_from_dbl_mantissa(tempp1,tempp2,src_exponent, |
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resultp1,resultp2); |
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if (Dbl_isone_sign(srcp1)) { |
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Dint_setone_sign(resultp1,resultp2); |
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} |
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Dint_copytoptr(resultp1,resultp2,dstptr); |
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/* check for inexact */ |
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if (Dbl_isinexact_to_fix(srcp1,srcp2,src_exponent)) { |
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if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION); |
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else Set_inexactflag(); |
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} |
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} |
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else { |
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Dint_setzero(resultp1,resultp2); |
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Dint_copytoptr(resultp1,resultp2,dstptr); |
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/* check for inexact */ |
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if (Dbl_isnotzero_exponentmantissa(srcp1,srcp2)) { |
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if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION); |
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else Set_inexactflag(); |
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} |
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} |
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return(NOEXCEPTION); |
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}
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