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/* Software floating-point emulation.
Compute powers of 10 into _BitInt.
Copyright (C) 2023 Free Software Foundation, Inc.
This file is part of GCC.
GCC 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 3, or (at your option) any later
version.
GCC 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.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
#include "soft-fp.h"
#include "bitint.h"
#ifdef __BITINT_MAXWIDTH__
# define BIL_VAL(x) ((UBILtype) (x))
# if BIL_TYPE_SIZE == 64
# define BIL_PAIR(x, y) ((BIL_VAL (x) << 32) | BIL_VAL (y))
# define BIL_OFF(x, y) (x)
# elif BIL_TYPE_SIZE == 32
# if __LIBGCC_BITINT_ORDER__ == __ORDER_BIG_ENDIAN__
# define BIL_PAIR(x, y) BIL_VAL (x), BIL_VAL (y)
# else
# define BIL_PAIR(x, y) BIL_VAL (y), BIL_VAL (x)
# endif
# define BIL_OFF(x, y) (y)
# else
# error Unsupported _BitInt limb size
# endif
#if __LIBGCC_BITINT_ORDER__ == __ORDER_BIG_ENDIAN__
# define BIL_SET2(a, b) a, b
# define BIL_SET3(a, b, c) a, b, c
# define BIL_SET4(a, b, c, d) a, b, c, d
# define BIL_SET5(a, b, c, d, e) a, b, c, d, e
# define BIL_SET6(a, b, c, d, e, f) a, b, c, d, e, f
# define BIL_SET7(a, b, c, d, e, f, g) a, b, c, d, e, f, g
# define BIL_SET8(a, b, c, d, e, f, g, h) a, b, c, d, e, f, g, h
# define BIL_SET9(a, b, c, d, e, f, g, h, i) a, b, c, d, e, f, g, h, i
# define BIL_SET10(a, b, c, d, e, f, g, h, i, j) a, b, c, d, e, f, g, h, i, j
# define BIL_SET11(a, b, c, d, e, f, g, h, i, j, k) \
a, b, c, d, e, f, g, h, i, j, k
# define BIL_SET12(a, b, c, d, e, f, g, h, i, j, k, l) \
a, b, c, d, e, f, g, h, i, j, k, l
# define BIL_SET13(a, b, c, d, e, f, g, h, i, j, k, l, m) \
a, b, c, d, e, f, g, h, i, j, k, l, m
# define BIL_SET14(a, b, c, d, e, f, g, h, i, j, k, l, m, n) \
a, b, c, d, e, f, g, h, i, j, k, l, m, n
# define BIL_SET15(a, b, c, d, e, f, g, h, i, j, k, l, m, n, o) \
a, b, c, d, e, f, g, h, i, j, k, l, m, n, o
#else
# define BIL_SET2(a, b) b, a
# define BIL_SET3(a, b, c) c, b, a
# define BIL_SET4(a, b, c, d) d, c, b, a
# define BIL_SET5(a, b, c, d, e) e, d, c, b, a
# define BIL_SET6(a, b, c, d, e, f) f, e, d, c, b, a
# define BIL_SET7(a, b, c, d, e, f, g) g, f, e, d, c, b, a
# define BIL_SET8(a, b, c, d, e, f, g, h) h, g, f, e, d, c, b, a
# define BIL_SET9(a, b, c, d, e, f, g, h, i) i, h, g, f, e, d, c, b, a
# define BIL_SET10(a, b, c, d, e, f, g, h, i, j) j, i, h, g, f, e, d, c, b, a
# define BIL_SET11(a, b, c, d, e, f, g, h, i, j, k) \
k, j, i, h, g, f, e, d, c, b, a
# define BIL_SET12(a, b, c, d, e, f, g, h, i, j, k, l) \
l, k, j, i, h, g, f, e, d, c, b, a
# define BIL_SET13(a, b, c, d, e, f, g, h, i, j, k, l, m) \
m, l, k, j, i, h, g, f, e, d, c, b, a
# define BIL_SET14(a, b, c, d, e, f, g, h, i, j, k, l, m, n) \
n, m, l, k, j, i, h, g, f, e, d, c, b, a
# define BIL_SET15(a, b, c, d, e, f, g, h, i, j, k, l, m, n, o) \
o, n, m, l, k, j, i, h, g, f, e, d, c, b, a
#endif
#include "bitintpow10.h"
/* Set r (_BitInt limbs with rprec bits) to pow10 (n),
where n is in [0, 6111]. Returns number of least significant
limbs with just 0s in it. */
USItype
__bid_pow10bitint (UBILtype *r, SItype rprec, USItype n)
{
USItype rn = ((USItype) rprec + BIL_TYPE_SIZE - 1) / BIL_TYPE_SIZE;
if (n <= 256)
{
/* No need to multiply anything, just copy it from pow10_limbs
array. */
USItype low_zeros = (n / 64) * (64 / BIL_TYPE_SIZE);
UBILtype *p = &pow10_limbs[pow10_offs[n]];
USItype cnt = pow10_offs[n + 1] - pow10_offs[n];
if (low_zeros)
__builtin_memset (r + BITINT_END (rn - low_zeros, 0), '\0',
low_zeros * sizeof (UBILtype));
__builtin_memcpy (r + BITINT_END (rn - low_zeros - cnt, low_zeros),
p, cnt * sizeof (UBILtype));
if (rn > low_zeros + cnt)
__builtin_memset (r + BITINT_END (0, low_zeros + cnt), '\0',
(rn - low_zeros - cnt) * sizeof (UBILtype));
return low_zeros;
}
else
{
USItype m = n / 256;
n &= 255;
USItype low_zeros = ((n / 64) + (m * 4)) * (64 / BIL_TYPE_SIZE);
UBILtype *pm = &pow10_limbs[pow10_offs[m + 255]];
USItype cntm = pow10_offs[m + 256] - pow10_offs[m + 255];
UBILtype *pn = &pow10_limbs[pow10_offs[n]];
USItype cntn = pow10_offs[n + 1] - pow10_offs[n];
if (low_zeros)
__builtin_memset (r + BITINT_END (rn - low_zeros, 0), '\0',
low_zeros * sizeof (UBILtype));
__mulbitint3 (r + BITINT_END (0, low_zeros),
rprec - low_zeros * BIL_TYPE_SIZE,
pm, cntm * BIL_TYPE_SIZE, pn, cntn * BIL_TYPE_SIZE);
return low_zeros;
}
}
#endif
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