| 1 |
734 |
jeremybenn |
/* Copyright (C) 2007, 2009 Free Software Foundation, Inc.
|
| 2 |
|
|
|
| 3 |
|
|
This file is part of GCC.
|
| 4 |
|
|
|
| 5 |
|
|
GCC is free software; you can redistribute it and/or modify it under
|
| 6 |
|
|
the terms of the GNU General Public License as published by the Free
|
| 7 |
|
|
Software Foundation; either version 3, or (at your option) any later
|
| 8 |
|
|
version.
|
| 9 |
|
|
|
| 10 |
|
|
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
|
| 11 |
|
|
WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
| 12 |
|
|
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
| 13 |
|
|
for more details.
|
| 14 |
|
|
|
| 15 |
|
|
Under Section 7 of GPL version 3, you are granted additional
|
| 16 |
|
|
permissions described in the GCC Runtime Library Exception, version
|
| 17 |
|
|
3.1, as published by the Free Software Foundation.
|
| 18 |
|
|
|
| 19 |
|
|
You should have received a copy of the GNU General Public License and
|
| 20 |
|
|
a copy of the GCC Runtime Library Exception along with this program;
|
| 21 |
|
|
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
| 22 |
|
|
<http://www.gnu.org/licenses/>. */
|
| 23 |
|
|
|
| 24 |
|
|
#define BID_128RES
|
| 25 |
|
|
#include "bid_internal.h"
|
| 26 |
|
|
|
| 27 |
|
|
#define DECIMAL_EXPONENT_BIAS_128 6176
|
| 28 |
|
|
#define MAX_DECIMAL_EXPONENT_128 12287
|
| 29 |
|
|
|
| 30 |
|
|
|
| 31 |
|
|
|
| 32 |
|
|
BID128_FUNCTION_ARG128_ARGTYPE2 (bid128_scalb, x, int, n)
|
| 33 |
|
|
|
| 34 |
|
|
UINT128 CX, CX2, CX8, res;
|
| 35 |
|
|
SINT64 exp64;
|
| 36 |
|
|
UINT64 sign_x;
|
| 37 |
|
|
int exponent_x, rmode;
|
| 38 |
|
|
|
| 39 |
|
|
// unpack arguments, check for NaN or Infinity
|
| 40 |
|
|
if (!unpack_BID128_value (&sign_x, &exponent_x, &CX, x)) {
|
| 41 |
|
|
// x is Inf. or NaN or 0
|
| 42 |
|
|
#ifdef SET_STATUS_FLAGS
|
| 43 |
|
|
if ((x.w[1] & SNAN_MASK64) == SNAN_MASK64) // y is sNaN
|
| 44 |
|
|
__set_status_flags (pfpsf, INVALID_EXCEPTION);
|
| 45 |
|
|
#endif
|
| 46 |
|
|
res.w[1] = CX.w[1] & QUIET_MASK64;
|
| 47 |
|
|
res.w[0] = CX.w[0];
|
| 48 |
|
|
if (!CX.w[1]) {
|
| 49 |
|
|
exp64 = (SINT64) exponent_x + (SINT64) n;
|
| 50 |
|
|
if(exp64<0) exp64=0;
|
| 51 |
|
|
if(exp64>MAX_DECIMAL_EXPONENT_128) exp64=MAX_DECIMAL_EXPONENT_128;
|
| 52 |
|
|
exponent_x = exp64;
|
| 53 |
|
|
get_BID128_very_fast (&res, sign_x, exponent_x, CX);
|
| 54 |
|
|
}
|
| 55 |
|
|
BID_RETURN (res);
|
| 56 |
|
|
}
|
| 57 |
|
|
|
| 58 |
|
|
exp64 = (SINT64) exponent_x + (SINT64) n;
|
| 59 |
|
|
exponent_x = exp64;
|
| 60 |
|
|
|
| 61 |
|
|
if ((UINT32) exponent_x <= MAX_DECIMAL_EXPONENT_128) {
|
| 62 |
|
|
get_BID128_very_fast (&res, sign_x, exponent_x, CX);
|
| 63 |
|
|
BID_RETURN (res);
|
| 64 |
|
|
}
|
| 65 |
|
|
// check for overflow
|
| 66 |
|
|
if (exp64 > MAX_DECIMAL_EXPONENT_128) {
|
| 67 |
|
|
if (CX.w[1] < 0x314dc6448d93ull) {
|
| 68 |
|
|
// try to normalize coefficient
|
| 69 |
|
|
do {
|
| 70 |
|
|
CX8.w[1] = (CX.w[1] << 3) | (CX.w[0] >> 61);
|
| 71 |
|
|
CX8.w[0] = CX.w[0] << 3;
|
| 72 |
|
|
CX2.w[1] = (CX.w[1] << 1) | (CX.w[0] >> 63);
|
| 73 |
|
|
CX2.w[0] = CX.w[0] << 1;
|
| 74 |
|
|
__add_128_128 (CX, CX2, CX8);
|
| 75 |
|
|
|
| 76 |
|
|
exponent_x--;
|
| 77 |
|
|
exp64--;
|
| 78 |
|
|
}
|
| 79 |
|
|
while (CX.w[1] < 0x314dc6448d93ull
|
| 80 |
|
|
&& exp64 > MAX_DECIMAL_EXPONENT_128);
|
| 81 |
|
|
|
| 82 |
|
|
}
|
| 83 |
|
|
if (exp64 <= MAX_DECIMAL_EXPONENT_128) {
|
| 84 |
|
|
get_BID128_very_fast (&res, sign_x, exponent_x, CX);
|
| 85 |
|
|
BID_RETURN (res);
|
| 86 |
|
|
} else
|
| 87 |
|
|
exponent_x = 0x7fffffff; // overflow
|
| 88 |
|
|
}
|
| 89 |
|
|
// exponent < 0
|
| 90 |
|
|
// the BID pack routine will round the coefficient
|
| 91 |
|
|
rmode = rnd_mode;
|
| 92 |
|
|
get_BID128 (&res, sign_x, exponent_x, CX, (unsigned int *) &rmode,
|
| 93 |
|
|
pfpsf);
|
| 94 |
|
|
BID_RETURN (res);
|
| 95 |
|
|
|
| 96 |
|
|
}
|
