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Diffstat (limited to 'kernel/arch/parisc/math-emu/frnd.c')
| -rw-r--r-- | kernel/arch/parisc/math-emu/frnd.c | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/kernel/arch/parisc/math-emu/frnd.c b/kernel/arch/parisc/math-emu/frnd.c new file mode 100644 index 000000000..904b3844b --- /dev/null +++ b/kernel/arch/parisc/math-emu/frnd.c @@ -0,0 +1,252 @@ +/* + * 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 + * + * Purpose: + * Single Floating-point Round to Integer + * Double Floating-point Round to Integer + * Quad Floating-point Round to Integer (returns unimplemented) + * + * External Interfaces: + * dbl_frnd(srcptr,nullptr,dstptr,status) + * sgl_frnd(srcptr,nullptr,dstptr,status) + * + * END_DESC +*/ + + +#include "float.h" +#include "sgl_float.h" +#include "dbl_float.h" +#include "cnv_float.h" + +/* + * Single Floating-point Round to Integer + */ + +/*ARGSUSED*/ +int +sgl_frnd(sgl_floating_point *srcptr, + unsigned int *nullptr, + sgl_floating_point *dstptr, + unsigned int *status) +{ + register unsigned int src, result; + register int src_exponent; + register boolean inexact = FALSE; + + src = *srcptr; + /* + * check source operand for NaN or infinity + */ + if ((src_exponent = Sgl_exponent(src)) == SGL_INFINITY_EXPONENT) { + /* + * is signaling NaN? + */ + if (Sgl_isone_signaling(src)) { + /* trap if INVALIDTRAP enabled */ + if (Is_invalidtrap_enabled()) return(INVALIDEXCEPTION); + /* make NaN quiet */ + Set_invalidflag(); + Sgl_set_quiet(src); + } + /* + * return quiet NaN or infinity + */ + *dstptr = src; + return(NOEXCEPTION); + } + /* + * Need to round? + */ + if ((src_exponent -= SGL_BIAS) >= SGL_P - 1) { + *dstptr = src; + return(NOEXCEPTION); + } + /* + * Generate result + */ + if (src_exponent >= 0) { + Sgl_clear_exponent_set_hidden(src); + result = src; + Sgl_rightshift(result,(SGL_P-1) - (src_exponent)); + /* 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)) Sgl_increment(result); + break; + case ROUNDMINUS: + if (Sgl_isone_sign(src)) Sgl_increment(result); + break; + case ROUNDNEAREST: + if (Sgl_isone_roundbit(src,src_exponent)) + if (Sgl_isone_stickybit(src,src_exponent) + || (Sgl_isone_lowmantissa(result))) + Sgl_increment(result); + } + } + Sgl_leftshift(result,(SGL_P-1) - (src_exponent)); + if (Sgl_isone_hiddenoverflow(result)) + Sgl_set_exponent(result,src_exponent + (SGL_BIAS+1)); + else Sgl_set_exponent(result,src_exponent + SGL_BIAS); + } + else { + result = src; /* set sign */ + Sgl_setzero_exponentmantissa(result); + /* check for inexact */ + if (Sgl_isnotzero_exponentmantissa(src)) { + inexact = TRUE; + /* round result */ + switch (Rounding_mode()) { + case ROUNDPLUS: + if (Sgl_iszero_sign(src)) + Sgl_set_exponent(result,SGL_BIAS); + break; + case ROUNDMINUS: + if (Sgl_isone_sign(src)) + Sgl_set_exponent(result,SGL_BIAS); + break; + case ROUNDNEAREST: + if (src_exponent == -1) + if (Sgl_isnotzero_mantissa(src)) + Sgl_set_exponent(result,SGL_BIAS); + } + } + } + *dstptr = result; + if (inexact) { + if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION); + else Set_inexactflag(); + } + return(NOEXCEPTION); +} + +/* + * Double Floating-point Round to Integer + */ + +/*ARGSUSED*/ +int +dbl_frnd( + dbl_floating_point *srcptr, + unsigned int *nullptr, + dbl_floating_point *dstptr, + unsigned int *status) +{ + register unsigned int srcp1, srcp2, resultp1, resultp2; + register int src_exponent; + register boolean inexact = FALSE; + + Dbl_copyfromptr(srcptr,srcp1,srcp2); + /* + * check source operand for NaN or infinity + */ + if ((src_exponent = Dbl_exponent(srcp1)) == DBL_INFINITY_EXPONENT) { + /* + * is signaling NaN? + */ + if (Dbl_isone_signaling(srcp1)) { + /* trap if INVALIDTRAP enabled */ + if (Is_invalidtrap_enabled()) return(INVALIDEXCEPTION); + /* make NaN quiet */ + Set_invalidflag(); + Dbl_set_quiet(srcp1); + } + /* + * return quiet NaN or infinity + */ + Dbl_copytoptr(srcp1,srcp2,dstptr); + return(NOEXCEPTION); + } + /* + * Need to round? + */ + if ((src_exponent -= DBL_BIAS) >= DBL_P - 1) { + Dbl_copytoptr(srcp1,srcp2,dstptr); + return(NOEXCEPTION); + } + /* + * Generate result + */ + if (src_exponent >= 0) { + Dbl_clear_exponent_set_hidden(srcp1); + resultp1 = srcp1; + resultp2 = srcp2; + Dbl_rightshift(resultp1,resultp2,(DBL_P-1) - (src_exponent)); + /* 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)) + Dbl_increment(resultp1,resultp2); + break; + case ROUNDMINUS: + if (Dbl_isone_sign(srcp1)) + Dbl_increment(resultp1,resultp2); + break; + case ROUNDNEAREST: + if (Dbl_isone_roundbit(srcp1,srcp2,src_exponent)) + if (Dbl_isone_stickybit(srcp1,srcp2,src_exponent) + || (Dbl_isone_lowmantissap2(resultp2))) + Dbl_increment(resultp1,resultp2); + } + } + Dbl_leftshift(resultp1,resultp2,(DBL_P-1) - (src_exponent)); + if (Dbl_isone_hiddenoverflow(resultp1)) + Dbl_set_exponent(resultp1,src_exponent + (DBL_BIAS+1)); + else Dbl_set_exponent(resultp1,src_exponent + DBL_BIAS); + } + else { + resultp1 = srcp1; /* set sign */ + Dbl_setzero_exponentmantissa(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)) + Dbl_set_exponent(resultp1,DBL_BIAS); + break; + case ROUNDMINUS: + if (Dbl_isone_sign(srcp1)) + Dbl_set_exponent(resultp1,DBL_BIAS); + break; + case ROUNDNEAREST: + if (src_exponent == -1) + if (Dbl_isnotzero_mantissa(srcp1,srcp2)) + Dbl_set_exponent(resultp1,DBL_BIAS); + } + } + } + Dbl_copytoptr(resultp1,resultp2,dstptr); + if (inexact) { + if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION); + else Set_inexactflag(); + } + return(NOEXCEPTION); +} |