version 1.1.1.2, 2000/09/09 14:13:11 |
version 1.1.1.3, 2003/08/25 16:06:35 |
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/* mpf_sub -- Subtract two floats. |
/* mpf_sub -- Subtract two floats. |
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Copyright (C) 1993, 1994, 1995, 1996, 1999, 2000 Free Software Foundation, |
Copyright 1993, 1994, 1995, 1996, 1999, 2000, 2001, 2002 Free Software |
Inc. |
Foundation, Inc. |
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This file is part of the GNU MP Library. |
This file is part of the GNU MP Library. |
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Line 24 MA 02111-1307, USA. */ |
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Line 24 MA 02111-1307, USA. */ |
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#include "gmp-impl.h" |
#include "gmp-impl.h" |
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void |
void |
#if __STDC__ |
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mpf_sub (mpf_ptr r, mpf_srcptr u, mpf_srcptr v) |
mpf_sub (mpf_ptr r, mpf_srcptr u, mpf_srcptr v) |
#else |
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mpf_sub (r, u, v) |
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mpf_ptr r; |
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mpf_srcptr u; |
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mpf_srcptr v; |
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#endif |
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{ |
{ |
mp_srcptr up, vp; |
mp_srcptr up, vp; |
mp_ptr rp, tp; |
mp_ptr rp, tp; |
Line 53 mpf_sub (r, u, v) |
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Line 46 mpf_sub (r, u, v) |
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} |
} |
if (vsize == 0) |
if (vsize == 0) |
{ |
{ |
mpf_set (r, u); |
if (r != u) |
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mpf_set (r, u); |
return; |
return; |
} |
} |
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Line 162 mpf_sub (r, u, v) |
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Line 156 mpf_sub (r, u, v) |
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1 00000000 ... |
1 00000000 ... |
0 ffffffff ... */ |
0 ffffffff ... */ |
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if (up[usize - 1] != 1 || vp[vsize - 1] != ~(mp_limb_t) 0 |
if (up[usize - 1] != 1 || vp[vsize - 1] != GMP_NUMB_MAX |
|| (usize >= 2 && up[usize - 2] != 0)) |
|| (usize >= 2 && up[usize - 2] != 0)) |
goto general_case; |
goto general_case; |
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Line 172 mpf_sub (r, u, v) |
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Line 166 mpf_sub (r, u, v) |
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/* Skip sequences of 00000000/ffffffff */ |
/* Skip sequences of 00000000/ffffffff */ |
while (vsize != 0 && usize != 0 && up[usize - 1] == 0 |
while (vsize != 0 && usize != 0 && up[usize - 1] == 0 |
&& vp[vsize - 1] == ~(mp_limb_t) 0) |
&& vp[vsize - 1] == GMP_NUMB_MAX) |
{ |
{ |
usize--; |
usize--; |
vsize--; |
vsize--; |
Line 181 mpf_sub (r, u, v) |
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Line 175 mpf_sub (r, u, v) |
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if (usize == 0) |
if (usize == 0) |
{ |
{ |
while (vsize != 0 && vp[vsize - 1] == ~(mp_limb_t) 0) |
while (vsize != 0 && vp[vsize - 1] == GMP_NUMB_MAX) |
{ |
{ |
vsize--; |
vsize--; |
exp--; |
exp--; |
Line 218 mpf_sub (r, u, v) |
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Line 212 mpf_sub (r, u, v) |
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mp_size_t size, i; |
mp_size_t size, i; |
size = vsize; |
size = vsize; |
for (i = 0; i < size; i++) |
for (i = 0; i < size; i++) |
tp[i] = ~vp[i]; |
tp[i] = ~vp[i] & GMP_NUMB_MASK; |
cy_limb = 1 - mpn_add_1 (tp, tp, vsize, (mp_limb_t) 1); |
cy_limb = 1 - mpn_add_1 (tp, tp, vsize, (mp_limb_t) 1); |
rsize = vsize; |
rsize = vsize; |
if (cy_limb == 0) |
if (cy_limb == 0) |
Line 246 mpf_sub (r, u, v) |
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Line 240 mpf_sub (r, u, v) |
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mp_size_t size, i; |
mp_size_t size, i; |
size = vsize - usize; |
size = vsize - usize; |
for (i = 0; i < size; i++) |
for (i = 0; i < size; i++) |
tp[i] = ~vp[i]; |
tp[i] = ~vp[i] & GMP_NUMB_MASK; |
cy_limb = mpn_sub_n (tp + size, up, vp + size, usize); |
cy_limb = mpn_sub_n (tp + size, up, vp + size, usize); |
cy_limb+= mpn_sub_1 (tp + size, tp + size, usize, (mp_limb_t) 1); |
cy_limb+= mpn_sub_1 (tp + size, tp + size, usize, (mp_limb_t) 1); |
cy_limb-= mpn_add_1 (tp, tp, vsize, (mp_limb_t) 1); |
cy_limb-= mpn_add_1 (tp, tp, vsize, (mp_limb_t) 1); |
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/* vvvvvvv */ |
/* vvvvvvv */ |
mp_size_t size, i; |
mp_size_t size, i; |
size = vsize - usize; |
size = vsize - usize; |
tp[0] = -vp[0]; |
tp[0] = -vp[0] & GMP_NUMB_MASK; |
for (i = 1; i < size; i++) |
for (i = 1; i < size; i++) |
tp[i] = ~vp[i]; |
tp[i] = ~vp[i] & GMP_NUMB_MASK; |
mpn_sub_n (tp + size, up, vp + size, usize); |
mpn_sub_n (tp + size, up, vp + size, usize); |
mpn_sub_1 (tp + size, tp + size, usize, (mp_limb_t) 1); |
mpn_sub_1 (tp + size, tp + size, usize, (mp_limb_t) 1); |
rsize = vsize; |
rsize = vsize; |
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/* vvvvv */ |
/* vvvvv */ |
mp_size_t size, i; |
mp_size_t size, i; |
size = vsize + ediff - usize; |
size = vsize + ediff - usize; |
tp[0] = -vp[0]; |
tp[0] = -vp[0] & GMP_NUMB_MASK; |
for (i = 1; i < size; i++) |
for (i = 1; i < size; i++) |
tp[i] = ~vp[i]; |
tp[i] = ~vp[i] & GMP_NUMB_MASK; |
mpn_sub (tp + size, up, usize, vp + size, usize - ediff); |
mpn_sub (tp + size, up, usize, vp + size, usize - ediff); |
mpn_sub_1 (tp + size, tp + size, usize, (mp_limb_t) 1); |
mpn_sub_1 (tp + size, tp + size, usize, (mp_limb_t) 1); |
rsize = vsize + ediff; |
rsize = vsize + ediff; |
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/* vv */ |
/* vv */ |
mp_size_t size, i; |
mp_size_t size, i; |
size = vsize + ediff - usize; |
size = vsize + ediff - usize; |
tp[0] = -vp[0]; |
tp[0] = -vp[0] & GMP_NUMB_MASK; |
for (i = 1; i < vsize; i++) |
for (i = 1; i < vsize; i++) |
tp[i] = ~vp[i]; |
tp[i] = ~vp[i] & GMP_NUMB_MASK; |
for (i = vsize; i < size; i++) |
for (i = vsize; i < size; i++) |
tp[i] = ~(mp_limb_t) 0; |
tp[i] = GMP_NUMB_MAX; |
mpn_sub_1 (tp + size, up, usize, (mp_limb_t) 1); |
mpn_sub_1 (tp + size, up, usize, (mp_limb_t) 1); |
rsize = size + usize; |
rsize = size + usize; |
} |
} |