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122 lines
2.6 KiB
122 lines
2.6 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/fp/denormal.c $ Revision: $ |
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* |
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* Purpose: |
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* <<please update with a synopsis of the functionality provided by this file>> |
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* |
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* External Interfaces: |
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* <<the following list was autogenerated, please review>> |
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* dbl_denormalize(dbl_opndp1,dbl_opndp2,inexactflag,rmode) |
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* sgl_denormalize(sgl_opnd,inexactflag,rmode) |
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* |
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* Internal Interfaces: |
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* <<please update>> |
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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 "hppa.h" |
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#include <linux/kernel.h> |
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/* #include <machine/sys/mdep_private.h> */ |
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#undef Fpustatus_register |
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#define Fpustatus_register Fpu_register[0] |
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void |
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sgl_denormalize(unsigned int *sgl_opnd, boolean *inexactflag, int rmode) |
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{ |
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unsigned int opnd; |
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int sign, exponent; |
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boolean guardbit = FALSE, stickybit, inexact; |
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opnd = *sgl_opnd; |
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stickybit = *inexactflag; |
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exponent = Sgl_exponent(opnd) - SGL_WRAP; |
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sign = Sgl_sign(opnd); |
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Sgl_denormalize(opnd,exponent,guardbit,stickybit,inexact); |
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if (inexact) { |
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switch (rmode) { |
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case ROUNDPLUS: |
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if (sign == 0) { |
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Sgl_increment(opnd); |
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} |
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break; |
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case ROUNDMINUS: |
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if (sign != 0) { |
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Sgl_increment(opnd); |
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} |
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break; |
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case ROUNDNEAREST: |
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if (guardbit && (stickybit || |
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Sgl_isone_lowmantissa(opnd))) { |
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Sgl_increment(opnd); |
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} |
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break; |
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} |
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} |
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Sgl_set_sign(opnd,sign); |
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*sgl_opnd = opnd; |
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*inexactflag = inexact; |
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return; |
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} |
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void |
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dbl_denormalize(unsigned int *dbl_opndp1, |
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unsigned int * dbl_opndp2, |
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boolean *inexactflag, |
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int rmode) |
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{ |
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unsigned int opndp1, opndp2; |
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int sign, exponent; |
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boolean guardbit = FALSE, stickybit, inexact; |
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opndp1 = *dbl_opndp1; |
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opndp2 = *dbl_opndp2; |
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stickybit = *inexactflag; |
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exponent = Dbl_exponent(opndp1) - DBL_WRAP; |
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sign = Dbl_sign(opndp1); |
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Dbl_denormalize(opndp1,opndp2,exponent,guardbit,stickybit,inexact); |
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if (inexact) { |
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switch (rmode) { |
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case ROUNDPLUS: |
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if (sign == 0) { |
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Dbl_increment(opndp1,opndp2); |
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} |
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break; |
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case ROUNDMINUS: |
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if (sign != 0) { |
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Dbl_increment(opndp1,opndp2); |
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} |
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break; |
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case ROUNDNEAREST: |
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if (guardbit && (stickybit || |
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Dbl_isone_lowmantissap2(opndp2))) { |
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Dbl_increment(opndp1,opndp2); |
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} |
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break; |
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} |
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} |
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Dbl_set_sign(opndp1,sign); |
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*dbl_opndp1 = opndp1; |
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*dbl_opndp2 = opndp2; |
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*inexactflag = inexact; |
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return; |
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}
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