diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/parisc/math-emu/dfdiv.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/parisc/math-emu/dfdiv.c | 400 |
1 files changed, 0 insertions, 400 deletions
diff --git a/ANDROID_3.4.5/arch/parisc/math-emu/dfdiv.c b/ANDROID_3.4.5/arch/parisc/math-emu/dfdiv.c deleted file mode 100644 index d7d4bec0..00000000 --- a/ANDROID_3.4.5/arch/parisc/math-emu/dfdiv.c +++ /dev/null @@ -1,400 +0,0 @@ -/* - * 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/dfdiv.c $Revision: 1.1 $ - * - * Purpose: - * Double Precision Floating-point Divide - * - * External Interfaces: - * dbl_fdiv(srcptr1,srcptr2,dstptr,status) - * - * Internal Interfaces: - * - * Theory: - * <<please update with a overview of the operation of this file>> - * - * END_DESC -*/ - - -#include "float.h" -#include "dbl_float.h" - -/* - * Double Precision Floating-point Divide - */ - -int -dbl_fdiv (dbl_floating_point * srcptr1, dbl_floating_point * srcptr2, - dbl_floating_point * dstptr, unsigned int *status) -{ - register unsigned int opnd1p1, opnd1p2, opnd2p1, opnd2p2; - register unsigned int opnd3p1, opnd3p2, resultp1, resultp2; - register int dest_exponent, count; - register boolean inexact = FALSE, guardbit = FALSE, stickybit = FALSE; - boolean is_tiny; - - Dbl_copyfromptr(srcptr1,opnd1p1,opnd1p2); - Dbl_copyfromptr(srcptr2,opnd2p1,opnd2p2); - /* - * set sign bit of result - */ - if (Dbl_sign(opnd1p1) ^ Dbl_sign(opnd2p1)) - Dbl_setnegativezerop1(resultp1); - else Dbl_setzerop1(resultp1); - /* - * check first operand for NaN's or infinity - */ - if (Dbl_isinfinity_exponent(opnd1p1)) { - if (Dbl_iszero_mantissa(opnd1p1,opnd1p2)) { - if (Dbl_isnotnan(opnd2p1,opnd2p2)) { - if (Dbl_isinfinity(opnd2p1,opnd2p2)) { - /* - * invalid since both operands - * are infinity - */ - if (Is_invalidtrap_enabled()) - return(INVALIDEXCEPTION); - Set_invalidflag(); - Dbl_makequietnan(resultp1,resultp2); - Dbl_copytoptr(resultp1,resultp2,dstptr); - return(NOEXCEPTION); - } - /* - * return infinity - */ - Dbl_setinfinity_exponentmantissa(resultp1,resultp2); - Dbl_copytoptr(resultp1,resultp2,dstptr); - return(NOEXCEPTION); - } - } - else { - /* - * is NaN; signaling or quiet? - */ - if (Dbl_isone_signaling(opnd1p1)) { - /* trap if INVALIDTRAP enabled */ - if (Is_invalidtrap_enabled()) - return(INVALIDEXCEPTION); - /* make NaN quiet */ - Set_invalidflag(); - Dbl_set_quiet(opnd1p1); - } - /* - * is second operand a signaling NaN? - */ - else if (Dbl_is_signalingnan(opnd2p1)) { - /* trap if INVALIDTRAP enabled */ - if (Is_invalidtrap_enabled()) - return(INVALIDEXCEPTION); - /* make NaN quiet */ - Set_invalidflag(); - Dbl_set_quiet(opnd2p1); - Dbl_copytoptr(opnd2p1,opnd2p2,dstptr); - return(NOEXCEPTION); - } - /* - * return quiet NaN - */ - Dbl_copytoptr(opnd1p1,opnd1p2,dstptr); - return(NOEXCEPTION); - } - } - /* - * check second operand for NaN's or infinity - */ - if (Dbl_isinfinity_exponent(opnd2p1)) { - if (Dbl_iszero_mantissa(opnd2p1,opnd2p2)) { - /* - * return zero - */ - Dbl_setzero_exponentmantissa(resultp1,resultp2); - Dbl_copytoptr(resultp1,resultp2,dstptr); - return(NOEXCEPTION); - } - /* - * is NaN; signaling or quiet? - */ - if (Dbl_isone_signaling(opnd2p1)) { - /* trap if INVALIDTRAP enabled */ - if (Is_invalidtrap_enabled()) return(INVALIDEXCEPTION); - /* make NaN quiet */ - Set_invalidflag(); - Dbl_set_quiet(opnd2p1); - } - /* - * return quiet NaN - */ - Dbl_copytoptr(opnd2p1,opnd2p2,dstptr); - return(NOEXCEPTION); - } - /* - * check for division by zero - */ - if (Dbl_iszero_exponentmantissa(opnd2p1,opnd2p2)) { - if (Dbl_iszero_exponentmantissa(opnd1p1,opnd1p2)) { - /* invalid since both operands are zero */ - if (Is_invalidtrap_enabled()) return(INVALIDEXCEPTION); - Set_invalidflag(); - Dbl_makequietnan(resultp1,resultp2); - Dbl_copytoptr(resultp1,resultp2,dstptr); - return(NOEXCEPTION); - } - if (Is_divisionbyzerotrap_enabled()) - return(DIVISIONBYZEROEXCEPTION); - Set_divisionbyzeroflag(); - Dbl_setinfinity_exponentmantissa(resultp1,resultp2); - Dbl_copytoptr(resultp1,resultp2,dstptr); - return(NOEXCEPTION); - } - /* - * Generate exponent - */ - dest_exponent = Dbl_exponent(opnd1p1) - Dbl_exponent(opnd2p1) + DBL_BIAS; - - /* - * Generate mantissa - */ - if (Dbl_isnotzero_exponent(opnd1p1)) { - /* set hidden bit */ - Dbl_clear_signexponent_set_hidden(opnd1p1); - } - else { - /* check for zero */ - if (Dbl_iszero_mantissa(opnd1p1,opnd1p2)) { - Dbl_setzero_exponentmantissa(resultp1,resultp2); - Dbl_copytoptr(resultp1,resultp2,dstptr); - return(NOEXCEPTION); - } - /* is denormalized, want to normalize */ - Dbl_clear_signexponent(opnd1p1); - Dbl_leftshiftby1(opnd1p1,opnd1p2); - Dbl_normalize(opnd1p1,opnd1p2,dest_exponent); - } - /* opnd2 needs to have hidden bit set with msb in hidden bit */ - if (Dbl_isnotzero_exponent(opnd2p1)) { - Dbl_clear_signexponent_set_hidden(opnd2p1); - } - else { - /* is denormalized; want to normalize */ - Dbl_clear_signexponent(opnd2p1); - Dbl_leftshiftby1(opnd2p1,opnd2p2); - while (Dbl_iszero_hiddenhigh7mantissa(opnd2p1)) { - dest_exponent+=8; - Dbl_leftshiftby8(opnd2p1,opnd2p2); - } - if (Dbl_iszero_hiddenhigh3mantissa(opnd2p1)) { - dest_exponent+=4; - Dbl_leftshiftby4(opnd2p1,opnd2p2); - } - while (Dbl_iszero_hidden(opnd2p1)) { - dest_exponent++; - Dbl_leftshiftby1(opnd2p1,opnd2p2); - } - } - - /* Divide the source mantissas */ - - /* - * A non-restoring divide algorithm is used. - */ - Twoword_subtract(opnd1p1,opnd1p2,opnd2p1,opnd2p2); - Dbl_setzero(opnd3p1,opnd3p2); - for (count=1; count <= DBL_P && (opnd1p1 || opnd1p2); count++) { - Dbl_leftshiftby1(opnd1p1,opnd1p2); - Dbl_leftshiftby1(opnd3p1,opnd3p2); - if (Dbl_iszero_sign(opnd1p1)) { - Dbl_setone_lowmantissap2(opnd3p2); - Twoword_subtract(opnd1p1,opnd1p2,opnd2p1,opnd2p2); - } - else { - Twoword_add(opnd1p1, opnd1p2, opnd2p1, opnd2p2); - } - } - if (count <= DBL_P) { - Dbl_leftshiftby1(opnd3p1,opnd3p2); - Dbl_setone_lowmantissap2(opnd3p2); - Dbl_leftshift(opnd3p1,opnd3p2,(DBL_P-count)); - if (Dbl_iszero_hidden(opnd3p1)) { - Dbl_leftshiftby1(opnd3p1,opnd3p2); - dest_exponent--; - } - } - else { - if (Dbl_iszero_hidden(opnd3p1)) { - /* need to get one more bit of result */ - Dbl_leftshiftby1(opnd1p1,opnd1p2); - Dbl_leftshiftby1(opnd3p1,opnd3p2); - if (Dbl_iszero_sign(opnd1p1)) { - Dbl_setone_lowmantissap2(opnd3p2); - Twoword_subtract(opnd1p1,opnd1p2,opnd2p1,opnd2p2); - } - else { - Twoword_add(opnd1p1,opnd1p2,opnd2p1,opnd2p2); - } - dest_exponent--; - } - if (Dbl_iszero_sign(opnd1p1)) guardbit = TRUE; - stickybit = Dbl_allp1(opnd1p1) || Dbl_allp2(opnd1p2); - } - inexact = guardbit | stickybit; - - /* - * round result - */ - if (inexact && (dest_exponent > 0 || Is_underflowtrap_enabled())) { - Dbl_clear_signexponent(opnd3p1); - switch (Rounding_mode()) { - case ROUNDPLUS: - if (Dbl_iszero_sign(resultp1)) - Dbl_increment(opnd3p1,opnd3p2); - break; - case ROUNDMINUS: - if (Dbl_isone_sign(resultp1)) - Dbl_increment(opnd3p1,opnd3p2); - break; - case ROUNDNEAREST: - if (guardbit && (stickybit || - Dbl_isone_lowmantissap2(opnd3p2))) { - Dbl_increment(opnd3p1,opnd3p2); - } - } - if (Dbl_isone_hidden(opnd3p1)) dest_exponent++; - } - Dbl_set_mantissa(resultp1,resultp2,opnd3p1,opnd3p2); - - /* - * Test for overflow - */ - if (dest_exponent >= DBL_INFINITY_EXPONENT) { - /* trap if OVERFLOWTRAP enabled */ - if (Is_overflowtrap_enabled()) { - /* - * Adjust bias of result - */ - Dbl_setwrapped_exponent(resultp1,dest_exponent,ovfl); - Dbl_copytoptr(resultp1,resultp2,dstptr); - if (inexact) - if (Is_inexacttrap_enabled()) - return(OVERFLOWEXCEPTION | INEXACTEXCEPTION); - else Set_inexactflag(); - return(OVERFLOWEXCEPTION); - } - Set_overflowflag(); - /* set result to infinity or largest number */ - Dbl_setoverflow(resultp1,resultp2); - inexact = TRUE; - } - /* - * Test for underflow - */ - else if (dest_exponent <= 0) { - /* trap if UNDERFLOWTRAP enabled */ - if (Is_underflowtrap_enabled()) { - /* - * Adjust bias of result - */ - Dbl_setwrapped_exponent(resultp1,dest_exponent,unfl); - Dbl_copytoptr(resultp1,resultp2,dstptr); - if (inexact) - if (Is_inexacttrap_enabled()) - return(UNDERFLOWEXCEPTION | INEXACTEXCEPTION); - else Set_inexactflag(); - return(UNDERFLOWEXCEPTION); - } - - /* Determine if should set underflow flag */ - is_tiny = TRUE; - if (dest_exponent == 0 && inexact) { - switch (Rounding_mode()) { - case ROUNDPLUS: - if (Dbl_iszero_sign(resultp1)) { - Dbl_increment(opnd3p1,opnd3p2); - if (Dbl_isone_hiddenoverflow(opnd3p1)) - is_tiny = FALSE; - Dbl_decrement(opnd3p1,opnd3p2); - } - break; - case ROUNDMINUS: - if (Dbl_isone_sign(resultp1)) { - Dbl_increment(opnd3p1,opnd3p2); - if (Dbl_isone_hiddenoverflow(opnd3p1)) - is_tiny = FALSE; - Dbl_decrement(opnd3p1,opnd3p2); - } - break; - case ROUNDNEAREST: - if (guardbit && (stickybit || - Dbl_isone_lowmantissap2(opnd3p2))) { - Dbl_increment(opnd3p1,opnd3p2); - if (Dbl_isone_hiddenoverflow(opnd3p1)) - is_tiny = FALSE; - Dbl_decrement(opnd3p1,opnd3p2); - } - break; - } - } - - /* - * denormalize result or set to signed zero - */ - stickybit = inexact; - Dbl_denormalize(opnd3p1,opnd3p2,dest_exponent,guardbit, - stickybit,inexact); - - /* return rounded number */ - if (inexact) { - switch (Rounding_mode()) { - case ROUNDPLUS: - if (Dbl_iszero_sign(resultp1)) { - Dbl_increment(opnd3p1,opnd3p2); - } - break; - case ROUNDMINUS: - if (Dbl_isone_sign(resultp1)) { - Dbl_increment(opnd3p1,opnd3p2); - } - break; - case ROUNDNEAREST: - if (guardbit && (stickybit || - Dbl_isone_lowmantissap2(opnd3p2))) { - Dbl_increment(opnd3p1,opnd3p2); - } - break; - } - if (is_tiny) Set_underflowflag(); - } - Dbl_set_exponentmantissa(resultp1,resultp2,opnd3p1,opnd3p2); - } - else Dbl_set_exponent(resultp1,dest_exponent); - Dbl_copytoptr(resultp1,resultp2,dstptr); - - /* check for inexact */ - if (inexact) { - if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION); - else Set_inexactflag(); - } - return(NOEXCEPTION); -} |