op-4.h
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- /* Software floating-point emulation.
- Basic four-word fraction declaration and manipulation.
- Copyright (C) 1997,1998,1999 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contributed by Richard Henderson (rth@cygnus.com),
- Jakub Jelinek (jj@ultra.linux.cz),
- David S. Miller (davem@redhat.com) and
- Peter Maydell (pmaydell@chiark.greenend.org.uk).
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public License as
- published by the Free Software Foundation; either version 2 of the
- License, or (at your option) any later version.
- The GNU C Library 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
- Library General Public License for more details.
- You should have received a copy of the GNU Library General Public
- License along with the GNU C Library; see the file COPYING.LIB. If
- not, write to the Free Software Foundation, Inc.,
- 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
- #ifndef __MATH_EMU_OP_4_H__
- #define __MATH_EMU_OP_4_H__
- #define _FP_FRAC_DECL_4(X) _FP_W_TYPE X##_f[4]
- #define _FP_FRAC_COPY_4(D,S)
- (D##_f[0] = S##_f[0], D##_f[1] = S##_f[1],
- D##_f[2] = S##_f[2], D##_f[3] = S##_f[3])
- #define _FP_FRAC_SET_4(X,I) __FP_FRAC_SET_4(X, I)
- #define _FP_FRAC_HIGH_4(X) (X##_f[3])
- #define _FP_FRAC_LOW_4(X) (X##_f[0])
- #define _FP_FRAC_WORD_4(X,w) (X##_f[w])
- #define _FP_FRAC_SLL_4(X,N)
- do {
- _FP_I_TYPE _up, _down, _skip, _i;
- _skip = (N) / _FP_W_TYPE_SIZE;
- _up = (N) % _FP_W_TYPE_SIZE;
- _down = _FP_W_TYPE_SIZE - _up;
- if (!_up)
- for (_i = 3; _i >= _skip; --_i)
- X##_f[_i] = X##_f[_i-_skip];
- else
- {
- for (_i = 3; _i > _skip; --_i)
- X##_f[_i] = X##_f[_i-_skip] << _up
- | X##_f[_i-_skip-1] >> _down;
- X##_f[_i--] = X##_f[0] << _up;
- }
- for (; _i >= 0; --_i)
- X##_f[_i] = 0;
- } while (0)
- /* This one was broken too */
- #define _FP_FRAC_SRL_4(X,N)
- do {
- _FP_I_TYPE _up, _down, _skip, _i;
- _skip = (N) / _FP_W_TYPE_SIZE;
- _down = (N) % _FP_W_TYPE_SIZE;
- _up = _FP_W_TYPE_SIZE - _down;
- if (!_down)
- for (_i = 0; _i <= 3-_skip; ++_i)
- X##_f[_i] = X##_f[_i+_skip];
- else
- {
- for (_i = 0; _i < 3-_skip; ++_i)
- X##_f[_i] = X##_f[_i+_skip] >> _down
- | X##_f[_i+_skip+1] << _up;
- X##_f[_i++] = X##_f[3] >> _down;
- }
- for (; _i < 4; ++_i)
- X##_f[_i] = 0;
- } while (0)
- /* Right shift with sticky-lsb.
- * What this actually means is that we do a standard right-shift,
- * but that if any of the bits that fall off the right hand side
- * were one then we always set the LSbit.
- */
- #define _FP_FRAC_SRS_4(X,N,size)
- do {
- _FP_I_TYPE _up, _down, _skip, _i;
- _FP_W_TYPE _s;
- _skip = (N) / _FP_W_TYPE_SIZE;
- _down = (N) % _FP_W_TYPE_SIZE;
- _up = _FP_W_TYPE_SIZE - _down;
- for (_s = _i = 0; _i < _skip; ++_i)
- _s |= X##_f[_i];
- _s |= X##_f[_i] << _up;
- /* s is now != 0 if we want to set the LSbit */
- if (!_down)
- for (_i = 0; _i <= 3-_skip; ++_i)
- X##_f[_i] = X##_f[_i+_skip];
- else
- {
- for (_i = 0; _i < 3-_skip; ++_i)
- X##_f[_i] = X##_f[_i+_skip] >> _down
- | X##_f[_i+_skip+1] << _up;
- X##_f[_i++] = X##_f[3] >> _down;
- }
- for (; _i < 4; ++_i)
- X##_f[_i] = 0;
- /* don't fix the LSB until the very end when we're sure f[0] is stable */
- X##_f[0] |= (_s != 0);
- } while (0)
- #define _FP_FRAC_ADD_4(R,X,Y)
- __FP_FRAC_ADD_4(R##_f[3], R##_f[2], R##_f[1], R##_f[0],
- X##_f[3], X##_f[2], X##_f[1], X##_f[0],
- Y##_f[3], Y##_f[2], Y##_f[1], Y##_f[0])
- #define _FP_FRAC_SUB_4(R,X,Y)
- __FP_FRAC_SUB_4(R##_f[3], R##_f[2], R##_f[1], R##_f[0],
- X##_f[3], X##_f[2], X##_f[1], X##_f[0],
- Y##_f[3], Y##_f[2], Y##_f[1], Y##_f[0])
- #define _FP_FRAC_DEC_4(X,Y)
- __FP_FRAC_DEC_4(X##_f[3], X##_f[2], X##_f[1], X##_f[0],
- Y##_f[3], Y##_f[2], Y##_f[1], Y##_f[0])
- #define _FP_FRAC_ADDI_4(X,I)
- __FP_FRAC_ADDI_4(X##_f[3], X##_f[2], X##_f[1], X##_f[0], I)
- #define _FP_ZEROFRAC_4 0,0,0,0
- #define _FP_MINFRAC_4 0,0,0,1
- #define _FP_MAXFRAC_4 (~(_FP_WS_TYPE)0), (~(_FP_WS_TYPE)0), (~(_FP_WS_TYPE)0), (~(_FP_WS_TYPE)0)
- #define _FP_FRAC_ZEROP_4(X) ((X##_f[0] | X##_f[1] | X##_f[2] | X##_f[3]) == 0)
- #define _FP_FRAC_NEGP_4(X) ((_FP_WS_TYPE)X##_f[3] < 0)
- #define _FP_FRAC_OVERP_4(fs,X) (_FP_FRAC_HIGH_##fs(X) & _FP_OVERFLOW_##fs)
- #define _FP_FRAC_CLEAR_OVERP_4(fs,X) (_FP_FRAC_HIGH_##fs(X) &= ~_FP_OVERFLOW_##fs)
- #define _FP_FRAC_EQ_4(X,Y)
- (X##_f[0] == Y##_f[0] && X##_f[1] == Y##_f[1]
- && X##_f[2] == Y##_f[2] && X##_f[3] == Y##_f[3])
- #define _FP_FRAC_GT_4(X,Y)
- (X##_f[3] > Y##_f[3] ||
- (X##_f[3] == Y##_f[3] && (X##_f[2] > Y##_f[2] ||
- (X##_f[2] == Y##_f[2] && (X##_f[1] > Y##_f[1] ||
- (X##_f[1] == Y##_f[1] && X##_f[0] > Y##_f[0])
- ))
- ))
- )
- #define _FP_FRAC_GE_4(X,Y)
- (X##_f[3] > Y##_f[3] ||
- (X##_f[3] == Y##_f[3] && (X##_f[2] > Y##_f[2] ||
- (X##_f[2] == Y##_f[2] && (X##_f[1] > Y##_f[1] ||
- (X##_f[1] == Y##_f[1] && X##_f[0] >= Y##_f[0])
- ))
- ))
- )
- #define _FP_FRAC_CLZ_4(R,X)
- do {
- if (X##_f[3])
- {
- __FP_CLZ(R,X##_f[3]);
- }
- else if (X##_f[2])
- {
- __FP_CLZ(R,X##_f[2]);
- R += _FP_W_TYPE_SIZE;
- }
- else if (X##_f[1])
- {
- __FP_CLZ(R,X##_f[2]);
- R += _FP_W_TYPE_SIZE*2;
- }
- else
- {
- __FP_CLZ(R,X##_f[0]);
- R += _FP_W_TYPE_SIZE*3;
- }
- } while(0)
- #define _FP_UNPACK_RAW_4(fs, X, val)
- do {
- union _FP_UNION_##fs _flo; _flo.flt = (val);
- X##_f[0] = _flo.bits.frac0;
- X##_f[1] = _flo.bits.frac1;
- X##_f[2] = _flo.bits.frac2;
- X##_f[3] = _flo.bits.frac3;
- X##_e = _flo.bits.exp;
- X##_s = _flo.bits.sign;
- } while (0)
- #define _FP_UNPACK_RAW_4_P(fs, X, val)
- do {
- union _FP_UNION_##fs *_flo =
- (union _FP_UNION_##fs *)(val);
-
- X##_f[0] = _flo->bits.frac0;
- X##_f[1] = _flo->bits.frac1;
- X##_f[2] = _flo->bits.frac2;
- X##_f[3] = _flo->bits.frac3;
- X##_e = _flo->bits.exp;
- X##_s = _flo->bits.sign;
- } while (0)
- #define _FP_PACK_RAW_4(fs, val, X)
- do {
- union _FP_UNION_##fs _flo;
- _flo.bits.frac0 = X##_f[0];
- _flo.bits.frac1 = X##_f[1];
- _flo.bits.frac2 = X##_f[2];
- _flo.bits.frac3 = X##_f[3];
- _flo.bits.exp = X##_e;
- _flo.bits.sign = X##_s;
- (val) = _flo.flt;
- } while (0)
- #define _FP_PACK_RAW_4_P(fs, val, X)
- do {
- union _FP_UNION_##fs *_flo =
- (union _FP_UNION_##fs *)(val);
-
- _flo->bits.frac0 = X##_f[0];
- _flo->bits.frac1 = X##_f[1];
- _flo->bits.frac2 = X##_f[2];
- _flo->bits.frac3 = X##_f[3];
- _flo->bits.exp = X##_e;
- _flo->bits.sign = X##_s;
- } while (0)
- /*
- * Multiplication algorithms:
- */
- /* Given a 1W * 1W => 2W primitive, do the extended multiplication. */
- #define _FP_MUL_MEAT_4_wide(wfracbits, R, X, Y, doit)
- do {
- _FP_FRAC_DECL_8(_z); _FP_FRAC_DECL_2(_b); _FP_FRAC_DECL_2(_c);
- _FP_FRAC_DECL_2(_d); _FP_FRAC_DECL_2(_e); _FP_FRAC_DECL_2(_f);
-
- doit(_FP_FRAC_WORD_8(_z,1), _FP_FRAC_WORD_8(_z,0), X##_f[0], Y##_f[0]);
- doit(_b_f1, _b_f0, X##_f[0], Y##_f[1]);
- doit(_c_f1, _c_f0, X##_f[1], Y##_f[0]);
- doit(_d_f1, _d_f0, X##_f[1], Y##_f[1]);
- doit(_e_f1, _e_f0, X##_f[0], Y##_f[2]);
- doit(_f_f1, _f_f0, X##_f[2], Y##_f[0]);
- __FP_FRAC_ADD_3(_FP_FRAC_WORD_8(_z,3),_FP_FRAC_WORD_8(_z,2),
- _FP_FRAC_WORD_8(_z,1), 0,_b_f1,_b_f0,
- 0,0,_FP_FRAC_WORD_8(_z,1));
- __FP_FRAC_ADD_3(_FP_FRAC_WORD_8(_z,3),_FP_FRAC_WORD_8(_z,2),
- _FP_FRAC_WORD_8(_z,1), 0,_c_f1,_c_f0,
- _FP_FRAC_WORD_8(_z,3),_FP_FRAC_WORD_8(_z,2),
- _FP_FRAC_WORD_8(_z,1));
- __FP_FRAC_ADD_3(_FP_FRAC_WORD_8(_z,4),_FP_FRAC_WORD_8(_z,3),
- _FP_FRAC_WORD_8(_z,2), 0,_d_f1,_d_f0,
- 0,_FP_FRAC_WORD_8(_z,3),_FP_FRAC_WORD_8(_z,2));
- __FP_FRAC_ADD_3(_FP_FRAC_WORD_8(_z,4),_FP_FRAC_WORD_8(_z,3),
- _FP_FRAC_WORD_8(_z,2), 0,_e_f1,_e_f0,
- _FP_FRAC_WORD_8(_z,4),_FP_FRAC_WORD_8(_z,3),
- _FP_FRAC_WORD_8(_z,2));
- __FP_FRAC_ADD_3(_FP_FRAC_WORD_8(_z,4),_FP_FRAC_WORD_8(_z,3),
- _FP_FRAC_WORD_8(_z,2), 0,_f_f1,_f_f0,
- _FP_FRAC_WORD_8(_z,4),_FP_FRAC_WORD_8(_z,3),
- _FP_FRAC_WORD_8(_z,2));
- doit(_b_f1, _b_f0, X##_f[0], Y##_f[3]);
- doit(_c_f1, _c_f0, X##_f[3], Y##_f[0]);
- doit(_d_f1, _d_f0, X##_f[1], Y##_f[2]);
- doit(_e_f1, _e_f0, X##_f[2], Y##_f[1]);
- __FP_FRAC_ADD_3(_FP_FRAC_WORD_8(_z,5),_FP_FRAC_WORD_8(_z,4),
- _FP_FRAC_WORD_8(_z,3), 0,_b_f1,_b_f0,
- 0,_FP_FRAC_WORD_8(_z,4),_FP_FRAC_WORD_8(_z,3));
- __FP_FRAC_ADD_3(_FP_FRAC_WORD_8(_z,5),_FP_FRAC_WORD_8(_z,4),
- _FP_FRAC_WORD_8(_z,3), 0,_c_f1,_c_f0,
- _FP_FRAC_WORD_8(_z,5),_FP_FRAC_WORD_8(_z,4),
- _FP_FRAC_WORD_8(_z,3));
- __FP_FRAC_ADD_3(_FP_FRAC_WORD_8(_z,5),_FP_FRAC_WORD_8(_z,4),
- _FP_FRAC_WORD_8(_z,3), 0,_d_f1,_d_f0,
- _FP_FRAC_WORD_8(_z,5),_FP_FRAC_WORD_8(_z,4),
- _FP_FRAC_WORD_8(_z,3));
- __FP_FRAC_ADD_3(_FP_FRAC_WORD_8(_z,5),_FP_FRAC_WORD_8(_z,4),
- _FP_FRAC_WORD_8(_z,3), 0,_e_f1,_e_f0,
- _FP_FRAC_WORD_8(_z,5),_FP_FRAC_WORD_8(_z,4),
- _FP_FRAC_WORD_8(_z,3));
- doit(_b_f1, _b_f0, X##_f[2], Y##_f[2]);
- doit(_c_f1, _c_f0, X##_f[1], Y##_f[3]);
- doit(_d_f1, _d_f0, X##_f[3], Y##_f[1]);
- doit(_e_f1, _e_f0, X##_f[2], Y##_f[3]);
- doit(_f_f1, _f_f0, X##_f[3], Y##_f[2]);
- __FP_FRAC_ADD_3(_FP_FRAC_WORD_8(_z,6),_FP_FRAC_WORD_8(_z,5),
- _FP_FRAC_WORD_8(_z,4), 0,_b_f1,_b_f0,
- 0,_FP_FRAC_WORD_8(_z,5),_FP_FRAC_WORD_8(_z,4));
- __FP_FRAC_ADD_3(_FP_FRAC_WORD_8(_z,6),_FP_FRAC_WORD_8(_z,5),
- _FP_FRAC_WORD_8(_z,4), 0,_c_f1,_c_f0,
- _FP_FRAC_WORD_8(_z,6),_FP_FRAC_WORD_8(_z,5),
- _FP_FRAC_WORD_8(_z,4));
- __FP_FRAC_ADD_3(_FP_FRAC_WORD_8(_z,6),_FP_FRAC_WORD_8(_z,5),
- _FP_FRAC_WORD_8(_z,4), 0,_d_f1,_d_f0,
- _FP_FRAC_WORD_8(_z,6),_FP_FRAC_WORD_8(_z,5),
- _FP_FRAC_WORD_8(_z,4));
- __FP_FRAC_ADD_3(_FP_FRAC_WORD_8(_z,7),_FP_FRAC_WORD_8(_z,6),
- _FP_FRAC_WORD_8(_z,5), 0,_e_f1,_e_f0,
- 0,_FP_FRAC_WORD_8(_z,6),_FP_FRAC_WORD_8(_z,5));
- __FP_FRAC_ADD_3(_FP_FRAC_WORD_8(_z,7),_FP_FRAC_WORD_8(_z,6),
- _FP_FRAC_WORD_8(_z,5), 0,_f_f1,_f_f0,
- _FP_FRAC_WORD_8(_z,7),_FP_FRAC_WORD_8(_z,6),
- _FP_FRAC_WORD_8(_z,5));
- doit(_b_f1, _b_f0, X##_f[3], Y##_f[3]);
- __FP_FRAC_ADD_2(_FP_FRAC_WORD_8(_z,7),_FP_FRAC_WORD_8(_z,6),
- _b_f1,_b_f0,
- _FP_FRAC_WORD_8(_z,7),_FP_FRAC_WORD_8(_z,6));
-
- /* Normalize since we know where the msb of the multiplicands
- were (bit B), we know that the msb of the of the product is
- at either 2B or 2B-1. */
- _FP_FRAC_SRS_8(_z, wfracbits-1, 2*wfracbits);
- __FP_FRAC_SET_4(R, _FP_FRAC_WORD_8(_z,3), _FP_FRAC_WORD_8(_z,2),
- _FP_FRAC_WORD_8(_z,1), _FP_FRAC_WORD_8(_z,0));
- } while (0)
- #define _FP_MUL_MEAT_4_gmp(wfracbits, R, X, Y)
- do {
- _FP_FRAC_DECL_8(_z);
-
- mpn_mul_n(_z_f, _x_f, _y_f, 4);
-
- /* Normalize since we know where the msb of the multiplicands
- were (bit B), we know that the msb of the of the product is
- at either 2B or 2B-1. */
- _FP_FRAC_SRS_8(_z, wfracbits-1, 2*wfracbits);
- __FP_FRAC_SET_4(R, _FP_FRAC_WORD_8(_z,3), _FP_FRAC_WORD_8(_z,2),
- _FP_FRAC_WORD_8(_z,1), _FP_FRAC_WORD_8(_z,0));
- } while (0)
- /*
- * Helper utility for _FP_DIV_MEAT_4_udiv:
- * pppp = m * nnn
- */
- #define umul_ppppmnnn(p3,p2,p1,p0,m,n2,n1,n0)
- do {
- UWtype _t;
- umul_ppmm(p1,p0,m,n0);
- umul_ppmm(p2,_t,m,n1);
- __FP_FRAC_ADDI_2(p2,p1,_t);
- umul_ppmm(p3,_t,m,n2);
- __FP_FRAC_ADDI_2(p3,p2,_t);
- } while (0)
- /*
- * Division algorithms:
- */
- #define _FP_DIV_MEAT_4_udiv(fs, R, X, Y)
- do {
- int _i;
- _FP_FRAC_DECL_4(_n); _FP_FRAC_DECL_4(_m);
- _FP_FRAC_SET_4(_n, _FP_ZEROFRAC_4);
- if (_FP_FRAC_GT_4(X, Y))
- {
- _n_f[3] = X##_f[0] << (_FP_W_TYPE_SIZE - 1);
- _FP_FRAC_SRL_4(X, 1);
- }
- else
- R##_e--;
-
- /* Normalize, i.e. make the most significant bit of the
- denominator set. */
- _FP_FRAC_SLL_4(Y, _FP_WFRACXBITS_##fs);
-
- for (_i = 3; ; _i--)
- {
- if (X##_f[3] == Y##_f[3])
- {
- /* This is a special case, not an optimization
- (X##_f[3]/Y##_f[3] would not fit into UWtype).
- As X## is guaranteed to be < Y, R##_f[_i] can be either
- (UWtype)-1 or (UWtype)-2. */
- R##_f[_i] = -1;
- if (!_i)
- break;
- __FP_FRAC_SUB_4(X##_f[3], X##_f[2], X##_f[1], X##_f[0],
- Y##_f[2], Y##_f[1], Y##_f[0], 0,
- X##_f[2], X##_f[1], X##_f[0], _n_f[_i]);
- _FP_FRAC_SUB_4(X, Y, X);
- if (X##_f[3] > Y##_f[3])
- {
- R##_f[_i] = -2;
- _FP_FRAC_ADD_4(X, Y, X);
- }
- }
- else
- {
- udiv_qrnnd(R##_f[_i], X##_f[3], X##_f[3], X##_f[2], Y##_f[3]);
- umul_ppppmnnn(_m_f[3], _m_f[2], _m_f[1], _m_f[0],
- R##_f[_i], Y##_f[2], Y##_f[1], Y##_f[0]);
- X##_f[2] = X##_f[1];
- X##_f[1] = X##_f[0];
- X##_f[0] = _n_f[_i];
- if (_FP_FRAC_GT_4(_m, X))
- {
- R##_f[_i]--;
- _FP_FRAC_ADD_4(X, Y, X);
- if (_FP_FRAC_GE_4(X, Y) && _FP_FRAC_GT_4(_m, X))
- {
- R##_f[_i]--;
- _FP_FRAC_ADD_4(X, Y, X);
- }
- }
- _FP_FRAC_DEC_4(X, _m);
- if (!_i)
- {
- if (!_FP_FRAC_EQ_4(X, _m))
- R##_f[0] |= _FP_WORK_STICKY;
- break;
- }
- }
- }
- } while (0)
- /*
- * Square root algorithms:
- * We have just one right now, maybe Newton approximation
- * should be added for those machines where division is fast.
- */
-
- #define _FP_SQRT_MEAT_4(R, S, T, X, q)
- do {
- while (q)
- {
- T##_f[3] = S##_f[3] + q;
- if (T##_f[3] <= X##_f[3])
- {
- S##_f[3] = T##_f[3] + q;
- X##_f[3] -= T##_f[3];
- R##_f[3] += q;
- }
- _FP_FRAC_SLL_4(X, 1);
- q >>= 1;
- }
- q = (_FP_W_TYPE)1 << (_FP_W_TYPE_SIZE - 1);
- while (q)
- {
- T##_f[2] = S##_f[2] + q;
- T##_f[3] = S##_f[3];
- if (T##_f[3] < X##_f[3] ||
- (T##_f[3] == X##_f[3] && T##_f[2] <= X##_f[2]))
- {
- S##_f[2] = T##_f[2] + q;
- S##_f[3] += (T##_f[2] > S##_f[2]);
- __FP_FRAC_DEC_2(X##_f[3], X##_f[2],
- T##_f[3], T##_f[2]);
- R##_f[2] += q;
- }
- _FP_FRAC_SLL_4(X, 1);
- q >>= 1;
- }
- q = (_FP_W_TYPE)1 << (_FP_W_TYPE_SIZE - 1);
- while (q)
- {
- T##_f[1] = S##_f[1] + q;
- T##_f[2] = S##_f[2];
- T##_f[3] = S##_f[3];
- if (T##_f[3] < X##_f[3] ||
- (T##_f[3] == X##_f[3] && (T##_f[2] < X##_f[2] ||
- (T##_f[2] == X##_f[2] && T##_f[1] <= X##_f[1]))))
- {
- S##_f[1] = T##_f[1] + q;
- S##_f[2] += (T##_f[1] > S##_f[1]);
- S##_f[3] += (T##_f[2] > S##_f[2]);
- __FP_FRAC_DEC_3(X##_f[3], X##_f[2], X##_f[1],
- T##_f[3], T##_f[2], T##_f[1]);
- R##_f[1] += q;
- }
- _FP_FRAC_SLL_4(X, 1);
- q >>= 1;
- }
- q = (_FP_W_TYPE)1 << (_FP_W_TYPE_SIZE - 1);
- while (q != _FP_WORK_ROUND)
- {
- T##_f[0] = S##_f[0] + q;
- T##_f[1] = S##_f[1];
- T##_f[2] = S##_f[2];
- T##_f[3] = S##_f[3];
- if (_FP_FRAC_GE_4(X,T))
- {
- S##_f[0] = T##_f[0] + q;
- S##_f[1] += (T##_f[0] > S##_f[0]);
- S##_f[2] += (T##_f[1] > S##_f[1]);
- S##_f[3] += (T##_f[2] > S##_f[2]);
- _FP_FRAC_DEC_4(X, T);
- R##_f[0] += q;
- }
- _FP_FRAC_SLL_4(X, 1);
- q >>= 1;
- }
- if (!_FP_FRAC_ZEROP_4(X))
- {
- if (_FP_FRAC_GT_4(X,S))
- R##_f[0] |= _FP_WORK_ROUND;
- R##_f[0] |= _FP_WORK_STICKY;
- }
- } while (0)
- /*
- * Internals
- */
- #define __FP_FRAC_SET_4(X,I3,I2,I1,I0)
- (X##_f[3] = I3, X##_f[2] = I2, X##_f[1] = I1, X##_f[0] = I0)
- #ifndef __FP_FRAC_ADD_3
- #define __FP_FRAC_ADD_3(r2,r1,r0,x2,x1,x0,y2,y1,y0)
- do {
- int _c1, _c2;
- r0 = x0 + y0;
- _c1 = r0 < x0;
- r1 = x1 + y1;
- _c2 = r1 < x1;
- r1 += _c1;
- _c2 |= r1 < _c1;
- r2 = x2 + y2 + _c2;
- } while (0)
- #endif
- #ifndef __FP_FRAC_ADD_4
- #define __FP_FRAC_ADD_4(r3,r2,r1,r0,x3,x2,x1,x0,y3,y2,y1,y0)
- do {
- int _c1, _c2, _c3;
- r0 = x0 + y0;
- _c1 = r0 < x0;
- r1 = x1 + y1;
- _c2 = r1 < x1;
- r1 += _c1;
- _c2 |= r1 < _c1;
- r2 = x2 + y2;
- _c3 = r2 < x2;
- r2 += _c2;
- _c3 |= r2 < _c2;
- r3 = x3 + y3 + _c3;
- } while (0)
- #endif
- #ifndef __FP_FRAC_SUB_3
- #define __FP_FRAC_SUB_3(r2,r1,r0,x2,x1,x0,y2,y1,y0)
- do {
- int _c1, _c2;
- r0 = x0 - y0;
- _c1 = r0 > x0;
- r1 = x1 - y1;
- _c2 = r1 > x1;
- r1 -= _c1;
- _c2 |= r1 > _c1;
- r2 = x2 - y2 - _c2;
- } while (0)
- #endif
- #ifndef __FP_FRAC_SUB_4
- #define __FP_FRAC_SUB_4(r3,r2,r1,r0,x3,x2,x1,x0,y3,y2,y1,y0)
- do {
- int _c1, _c2, _c3;
- r0 = x0 - y0;
- _c1 = r0 > x0;
- r1 = x1 - y1;
- _c2 = r1 > x1;
- r1 -= _c1;
- _c2 |= r1 > _c1;
- r2 = x2 - y2;
- _c3 = r2 > x2;
- r2 -= _c2;
- _c3 |= r2 > _c2;
- r3 = x3 - y3 - _c3;
- } while (0)
- #endif
- #ifndef __FP_FRAC_DEC_3
- #define __FP_FRAC_DEC_3(x2,x1,x0,y2,y1,y0)
- do {
- UWtype _t0, _t1, _t2;
- _t0 = x0, _t1 = x1, _t2 = x2;
- __FP_FRAC_SUB_3 (x2, x1, x0, _t2, _t1, _t0, y2, y1, y0);
- } while (0)
- #endif
- #ifndef __FP_FRAC_DEC_4
- #define __FP_FRAC_DEC_4(x3,x2,x1,x0,y3,y2,y1,y0)
- do {
- UWtype _t0, _t1, _t2, _t3;
- _t0 = x0, _t1 = x1, _t2 = x2, _t3 = x3;
- __FP_FRAC_SUB_4 (x3,x2,x1,x0,_t3,_t2,_t1,_t0, y3,y2,y1,y0);
- } while (0)
- #endif
- #ifndef __FP_FRAC_ADDI_4
- #define __FP_FRAC_ADDI_4(x3,x2,x1,x0,i)
- do {
- UWtype _t;
- _t = ((x0 += i) < i);
- x1 += _t; _t = (x1 < _t);
- x2 += _t; _t = (x2 < _t);
- x3 += _t;
- } while (0)
- #endif
- /* Convert FP values between word sizes. This appears to be more
- * complicated than I'd have expected it to be, so these might be
- * wrong... These macros are in any case somewhat bogus because they
- * use information about what various FRAC_n variables look like
- * internally [eg, that 2 word vars are X_f0 and x_f1]. But so do
- * the ones in op-2.h and op-1.h.
- */
- #define _FP_FRAC_CONV_1_4(dfs, sfs, D, S)
- do {
- if (S##_c != FP_CLS_NAN)
- _FP_FRAC_SRS_4(S, (_FP_WFRACBITS_##sfs - _FP_WFRACBITS_##dfs),
- _FP_WFRACBITS_##sfs);
- else
- _FP_FRAC_SRL_4(S, (_FP_WFRACBITS_##sfs - _FP_WFRACBITS_##dfs));
- D##_f = S##_f[0];
- } while (0)
- #define _FP_FRAC_CONV_2_4(dfs, sfs, D, S)
- do {
- if (S##_c != FP_CLS_NAN)
- _FP_FRAC_SRS_4(S, (_FP_WFRACBITS_##sfs - _FP_WFRACBITS_##dfs),
- _FP_WFRACBITS_##sfs);
- else
- _FP_FRAC_SRL_4(S, (_FP_WFRACBITS_##sfs - _FP_WFRACBITS_##dfs));
- D##_f0 = S##_f[0];
- D##_f1 = S##_f[1];
- } while (0)
- /* Assembly/disassembly for converting to/from integral types.
- * No shifting or overflow handled here.
- */
- /* Put the FP value X into r, which is an integer of size rsize. */
- #define _FP_FRAC_ASSEMBLE_4(r, X, rsize)
- do {
- if (rsize <= _FP_W_TYPE_SIZE)
- r = X##_f[0];
- else if (rsize <= 2*_FP_W_TYPE_SIZE)
- {
- r = X##_f[1];
- r <<= _FP_W_TYPE_SIZE;
- r += X##_f[0];
- }
- else
- {
- /* I'm feeling lazy so we deal with int == 3words (implausible)*/
- /* and int == 4words as a single case. */
- r = X##_f[3];
- r <<= _FP_W_TYPE_SIZE;
- r += X##_f[2];
- r <<= _FP_W_TYPE_SIZE;
- r += X##_f[1];
- r <<= _FP_W_TYPE_SIZE;
- r += X##_f[0];
- }
- } while (0)
- /* "No disassemble Number Five!" */
- /* move an integer of size rsize into X's fractional part. We rely on
- * the _f[] array consisting of words of size _FP_W_TYPE_SIZE to avoid
- * having to mask the values we store into it.
- */
- #define _FP_FRAC_DISASSEMBLE_4(X, r, rsize)
- do {
- X##_f[0] = r;
- X##_f[1] = (rsize <= _FP_W_TYPE_SIZE ? 0 : r >> _FP_W_TYPE_SIZE);
- X##_f[2] = (rsize <= 2*_FP_W_TYPE_SIZE ? 0 : r >> 2*_FP_W_TYPE_SIZE);
- X##_f[3] = (rsize <= 3*_FP_W_TYPE_SIZE ? 0 : r >> 3*_FP_W_TYPE_SIZE);
- } while (0)
- #define _FP_FRAC_CONV_4_1(dfs, sfs, D, S)
- do {
- D##_f[0] = S##_f;
- D##_f[1] = D##_f[2] = D##_f[3] = 0;
- _FP_FRAC_SLL_4(D, (_FP_WFRACBITS_##dfs - _FP_WFRACBITS_##sfs));
- } while (0)
- #define _FP_FRAC_CONV_4_2(dfs, sfs, D, S)
- do {
- D##_f[0] = S##_f0;
- D##_f[1] = S##_f1;
- D##_f[2] = D##_f[3] = 0;
- _FP_FRAC_SLL_4(D, (_FP_WFRACBITS_##dfs - _FP_WFRACBITS_##sfs));
- } while (0)
- #endif