/* $OpenBSD: fcnvfx.c,v 1.9 2023/03/08 04:43:07 guenther Exp $ */ /* (c) Copyright 1986 HEWLETT-PACKARD COMPANY To anyone who acknowledges that this file is provided "AS IS" without any express or implied warranty: permission to use, copy, modify, and distribute this file for any purpose is hereby granted without fee, provided that the above copyright notice and this notice appears in all copies, and that the name of Hewlett-Packard Company not be used in advertising or publicity pertaining to distribution of the software without specific, written prior permission. Hewlett-Packard Company makes no representations about the suitability of this software for any purpose. */ /* @(#)fcnvfx.c: Revision: 2.8.88.2 Date: 93/12/08 13:27:29 */ #include "float.h" #include "sgl_float.h" #include "dbl_float.h" #include "cnv_float.h" /* * Single Floating-point to Single Fixed-point */ int sgl_to_sgl_fcnvfx(srcptr, null, dstptr, status) sgl_floating_point *srcptr, *null; int *dstptr; unsigned int *status; { register unsigned int src, temp; register int src_exponent, result; register int inexact = FALSE; 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); /* check for inexact */ if (Sgl_isinexact_to_fix(src,src_exponent)) { inexact = TRUE; /* round result */ switch (Rounding_mode()) { case ROUNDPLUS: if (Sgl_iszero_sign(src)) result++; break; case ROUNDMINUS: if (Sgl_isone_sign(src)) result--; break; case ROUNDNEAREST: if (Sgl_isone_roundbit(src,src_exponent)) { if (Sgl_isone_stickybit(src,src_exponent) || (Sgl_isone_lowmantissa(temp))) { if (Sgl_iszero_sign(src)) result++; else result--; } } } } } else { result = 0; /* check for inexact */ if (Sgl_isnotzero_exponentmantissa(src)) { inexact = TRUE; /* round result */ switch (Rounding_mode()) { case ROUNDPLUS: if (Sgl_iszero_sign(src)) result++; break; case ROUNDMINUS: if (Sgl_isone_sign(src)) result--; break; case ROUNDNEAREST: if (src_exponent == -1) if (Sgl_isnotzero_mantissa(src)) { if (Sgl_iszero_sign(src)) result++; else result--; } } } } *dstptr = result; if (inexact) { if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION); else Set_inexactflag(); } return(NOEXCEPTION); } /* * Single Floating-point to Double Fixed-point */ int sgl_to_dbl_fcnvfx(srcptr, null, dstptr, status) sgl_floating_point *srcptr, *null; dbl_integer *dstptr; unsigned int *status; { register int src_exponent, resultp1; register unsigned int src, temp, resultp2; register int inexact = FALSE; 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); } /* check for inexact */ if (Sgl_isinexact_to_fix(src,src_exponent)) { inexact = TRUE; /* round result */ switch (Rounding_mode()) { case ROUNDPLUS: if (Sgl_iszero_sign(src)) { Dint_increment(resultp1,resultp2); } break; case ROUNDMINUS: if (Sgl_isone_sign(src)) { Dint_decrement(resultp1,resultp2); } break; case ROUNDNEAREST: if (Sgl_isone_roundbit(src,src_exponent)) if (Sgl_isone_stickybit(src,src_exponent) || (Dint_isone_lowp2(resultp2))) { if (Sgl_iszero_sign(src)) { Dint_increment(resultp1,resultp2); } else { Dint_decrement(resultp1,resultp2); } } } } } else { Dint_setzero(resultp1,resultp2); /* check for inexact */ if (Sgl_isnotzero_exponentmantissa(src)) { inexact = TRUE; /* round result */ switch (Rounding_mode()) { case ROUNDPLUS: if (Sgl_iszero_sign(src)) { Dint_increment(resultp1,resultp2); } break; case ROUNDMINUS: if (Sgl_isone_sign(src)) { Dint_decrement(resultp1,resultp2); } break; case ROUNDNEAREST: if (src_exponent == -1) if (Sgl_isnotzero_mantissa(src)) { if (Sgl_iszero_sign(src)) { Dint_increment(resultp1,resultp2); } else { Dint_decrement(resultp1,resultp2); } } } } } Dint_copytoptr(resultp1,resultp2,dstptr); if (inexact) { if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION); else Set_inexactflag(); } return(NOEXCEPTION); } /* * Double Floating-point to Single Fixed-point */ int dbl_to_sgl_fcnvfx(srcptr, null, dstptr, status) dbl_floating_point *srcptr, *null; int *dstptr; unsigned int *status; { register unsigned int srcp1,srcp2, tempp1,tempp2; register int src_exponent, result; register int inexact = FALSE; 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); /* check for inexact */ if (Dbl_isinexact_to_fix(srcp1,srcp2,src_exponent)) { inexact = TRUE; /* round result */ switch (Rounding_mode()) { case ROUNDPLUS: if (Dbl_iszero_sign(srcp1)) result++; break; case ROUNDMINUS: if (Dbl_isone_sign(srcp1)) result--; break; case ROUNDNEAREST: if (Dbl_isone_roundbit(srcp1,srcp2,src_exponent)) if (Dbl_isone_stickybit(srcp1,srcp2,src_exponent) || (Dbl_isone_lowmantissap1(tempp1))) { if (Dbl_iszero_sign(srcp1)) result++; else result--; } } /* check for overflow */ if ((Dbl_iszero_sign(srcp1) && result < 0) || (Dbl_isone_sign(srcp1) && result > 0)) { if (Dbl_iszero_sign(srcp1)) result = 0x7fffffff; else result = 0x80000000; if (Is_overflowtrap_enabled()) { if (Is_inexacttrap_enabled()) return(OVERFLOWEXCEPTION|INEXACTEXCEPTION); else Set_inexactflag(); return(OVERFLOWEXCEPTION); } Set_overflowflag(); *dstptr = result; if (Is_inexacttrap_enabled() ) return(INEXACTEXCEPTION); else Set_inexactflag(); return(NOEXCEPTION); } } } else { result = 0; /* check for inexact */ if (Dbl_isnotzero_exponentmantissa(srcp1,srcp2)) { inexact = TRUE; /* round result */ switch (Rounding_mode()) { case ROUNDPLUS: if (Dbl_iszero_sign(srcp1)) result++; break; case ROUNDMINUS: if (Dbl_isone_sign(srcp1)) result--; break; case ROUNDNEAREST: if (src_exponent == -1) if (Dbl_isnotzero_mantissa(srcp1,srcp2)) { if (Dbl_iszero_sign(srcp1)) result++; else result--; } } } } *dstptr = result; if (inexact) { if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION); else Set_inexactflag(); } return(NOEXCEPTION); } /* * Double Floating-point to Double Fixed-point */ int dbl_to_dbl_fcnvfx(srcptr, null, dstptr, status) dbl_floating_point *srcptr, *null; dbl_integer *dstptr; unsigned int *status; { register int src_exponent, resultp1; register unsigned int srcp1, srcp2, tempp1, tempp2, resultp2; register int inexact = FALSE; 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); } /* check for inexact */ if (Dbl_isinexact_to_fix(srcp1,srcp2,src_exponent)) { inexact = TRUE; /* round result */ switch (Rounding_mode()) { case ROUNDPLUS: if (Dbl_iszero_sign(srcp1)) { Dint_increment(resultp1,resultp2); } break; case ROUNDMINUS: if (Dbl_isone_sign(srcp1)) { Dint_decrement(resultp1,resultp2); } break; case ROUNDNEAREST: if (Dbl_isone_roundbit(srcp1,srcp2,src_exponent)) if (Dbl_isone_stickybit(srcp1,srcp2,src_exponent) || (Dint_isone_lowp2(resultp2))) { if (Dbl_iszero_sign(srcp1)) { Dint_increment(resultp1,resultp2); } else { Dint_decrement(resultp1,resultp2); } } } } } else { Dint_setzero(resultp1,resultp2); /* check for inexact */ if (Dbl_isnotzero_exponentmantissa(srcp1,srcp2)) { inexact = TRUE; /* round result */ switch (Rounding_mode()) { case ROUNDPLUS: if (Dbl_iszero_sign(srcp1)) { Dint_increment(resultp1,resultp2); } break; case ROUNDMINUS: if (Dbl_isone_sign(srcp1)) { Dint_decrement(resultp1,resultp2); } break; case ROUNDNEAREST: if (src_exponent == -1) if (Dbl_isnotzero_mantissa(srcp1,srcp2)) { if (Dbl_iszero_sign(srcp1)) { Dint_increment(resultp1,resultp2); } else { Dint_decrement(resultp1,resultp2); } } } } } Dint_copytoptr(resultp1,resultp2,dstptr); if (inexact) { if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION); else Set_inexactflag(); } return(NOEXCEPTION); }