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319 lines
7.2 KiB
319 lines
7.2 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/fcnvfut.c $Revision: 1.1 $ |
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* |
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* Purpose: |
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* Floating-point to Unsigned Fixed-point Converts with Truncation |
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* |
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* External Interfaces: |
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* dbl_to_dbl_fcnvfut(srcptr,nullptr,dstptr,status) |
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* dbl_to_sgl_fcnvfut(srcptr,nullptr,dstptr,status) |
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* sgl_to_dbl_fcnvfut(srcptr,nullptr,dstptr,status) |
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* sgl_to_sgl_fcnvfut(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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* Floating-point to Unsigned Fixed-point Converts with Truncation * |
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************************************************************************/ |
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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_fcnvfut (sgl_floating_point * srcptr, unsigned int *nullptr, |
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unsigned int *dstptr, unsigned int *status) |
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{ |
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register unsigned int src, result; |
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register int src_exponent; |
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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 + 1) { |
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if (Sgl_isone_sign(src)) { |
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result = 0; |
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} else { |
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result = 0xffffffff; |
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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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*dstptr = result; |
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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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/* |
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* Check sign. |
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* If negative, trap unimplemented. |
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*/ |
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if (Sgl_isone_sign(src)) { |
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result = 0; |
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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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Sgl_clear_signexponent_set_hidden(src); |
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Suint_from_sgl_mantissa(src,src_exponent,result); |
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*dstptr = result; |
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/* check for inexact */ |
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if (Sgl_isinexact_to_unsigned(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 Unsigned Fixed |
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*/ |
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/*ARGSUSED*/ |
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int |
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sgl_to_dbl_fcnvfut (sgl_floating_point * srcptr, unsigned int *nullptr, |
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dbl_unsigned * dstptr, unsigned int *status) |
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{ |
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register int src_exponent; |
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register unsigned int src, resultp1, 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 + 1) { |
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if (Sgl_isone_sign(src)) { |
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resultp1 = resultp2 = 0; |
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} else { |
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resultp1 = resultp2 = 0xffffffff; |
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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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Duint_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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/* |
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* Check sign. |
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* If negative, trap unimplemented. |
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*/ |
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if (Sgl_isone_sign(src)) { |
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resultp1 = resultp2 = 0; |
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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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Duint_copytoptr(resultp1,resultp2,dstptr); |
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return(NOEXCEPTION); |
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} |
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Sgl_clear_signexponent_set_hidden(src); |
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Duint_from_sgl_mantissa(src,src_exponent,resultp1,resultp2); |
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Duint_copytoptr(resultp1,resultp2,dstptr); |
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/* check for inexact */ |
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if (Sgl_isinexact_to_unsigned(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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Duint_setzero(resultp1,resultp2); |
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Duint_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 Unsigned Fixed |
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*/ |
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/*ARGSUSED*/ |
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int |
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dbl_to_sgl_fcnvfut (dbl_floating_point * srcptr, unsigned int *nullptr, |
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unsigned int *dstptr, unsigned int *status) |
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{ |
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register unsigned int srcp1, srcp2, result; |
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register int src_exponent; |
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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 + 1) { |
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if (Dbl_isone_sign(srcp1)) { |
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result = 0; |
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} else { |
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result = 0xffffffff; |
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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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*dstptr = result; |
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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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/* |
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* Check sign. |
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* If negative, trap unimplemented. |
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*/ |
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if (Dbl_isone_sign(srcp1)) { |
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result = 0; |
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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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Dbl_clear_signexponent_set_hidden(srcp1); |
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Suint_from_dbl_mantissa(srcp1,srcp2,src_exponent,result); |
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*dstptr = result; |
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/* check for inexact */ |
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if (Dbl_isinexact_to_unsigned(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 Unsigned Fixed |
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*/ |
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/*ARGSUSED*/ |
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int |
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dbl_to_dbl_fcnvfut (dbl_floating_point * srcptr, unsigned int *nullptr, |
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dbl_unsigned * dstptr, unsigned int *status) |
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{ |
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register int src_exponent; |
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register unsigned int srcp1, srcp2, resultp1, 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 + 1) { |
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if (Dbl_isone_sign(srcp1)) { |
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resultp1 = resultp2 = 0; |
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} else { |
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resultp1 = resultp2 = 0xffffffff; |
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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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Duint_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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/* |
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* Check sign. |
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* If negative, trap unimplemented. |
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*/ |
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if (Dbl_isone_sign(srcp1)) { |
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resultp1 = resultp2 = 0; |
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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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Duint_copytoptr(resultp1,resultp2,dstptr); |
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return(NOEXCEPTION); |
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} |
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Dbl_clear_signexponent_set_hidden(srcp1); |
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Duint_from_dbl_mantissa(srcp1,srcp2,src_exponent, |
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resultp1,resultp2); |
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Duint_copytoptr(resultp1,resultp2,dstptr); |
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/* check for inexact */ |
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if (Dbl_isinexact_to_unsigned(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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Duint_setzero(resultp1,resultp2); |
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Duint_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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