diff options
Diffstat (limited to 'arch/mips/math-emu/dp_flong.c')
-rw-r--r-- | arch/mips/math-emu/dp_flong.c | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/arch/mips/math-emu/dp_flong.c b/arch/mips/math-emu/dp_flong.c new file mode 100644 index 000000000000..cb105b1dd860 --- /dev/null +++ b/arch/mips/math-emu/dp_flong.c | |||
@@ -0,0 +1,78 @@ | |||
1 | /* IEEE754 floating point arithmetic | ||
2 | * double precision: common utilities | ||
3 | */ | ||
4 | /* | ||
5 | * MIPS floating point support | ||
6 | * Copyright (C) 1994-2000 Algorithmics Ltd. | ||
7 | * http://www.algor.co.uk | ||
8 | * | ||
9 | * ######################################################################## | ||
10 | * | ||
11 | * This program is free software; you can distribute it and/or modify it | ||
12 | * under the terms of the GNU General Public License (Version 2) as | ||
13 | * published by the Free Software Foundation. | ||
14 | * | ||
15 | * This program is distributed in the hope it will be useful, but WITHOUT | ||
16 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
17 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
18 | * for more details. | ||
19 | * | ||
20 | * You should have received a copy of the GNU General Public License along | ||
21 | * with this program; if not, write to the Free Software Foundation, Inc., | ||
22 | * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. | ||
23 | * | ||
24 | * ######################################################################## | ||
25 | */ | ||
26 | |||
27 | |||
28 | #include "ieee754dp.h" | ||
29 | |||
30 | ieee754dp ieee754dp_flong(s64 x) | ||
31 | { | ||
32 | COMPXDP; | ||
33 | |||
34 | CLEARCX; | ||
35 | |||
36 | xc = ( 0 ? xc : xc ); | ||
37 | |||
38 | if (x == 0) | ||
39 | return ieee754dp_zero(0); | ||
40 | if (x == 1 || x == -1) | ||
41 | return ieee754dp_one(x < 0); | ||
42 | if (x == 10 || x == -10) | ||
43 | return ieee754dp_ten(x < 0); | ||
44 | |||
45 | xs = (x < 0); | ||
46 | if (xs) { | ||
47 | if (x == (1ULL << 63)) | ||
48 | xm = (1ULL << 63); /* max neg can't be safely negated */ | ||
49 | else | ||
50 | xm = -x; | ||
51 | } else { | ||
52 | xm = x; | ||
53 | } | ||
54 | |||
55 | /* normalize */ | ||
56 | xe = DP_MBITS + 3; | ||
57 | if (xm >> (DP_MBITS + 1 + 3)) { | ||
58 | /* shunt out overflow bits */ | ||
59 | while (xm >> (DP_MBITS + 1 + 3)) { | ||
60 | XDPSRSX1(); | ||
61 | } | ||
62 | } else { | ||
63 | /* normalize in grs extended double precision */ | ||
64 | while ((xm >> (DP_MBITS + 3)) == 0) { | ||
65 | xm <<= 1; | ||
66 | xe--; | ||
67 | } | ||
68 | } | ||
69 | DPNORMRET1(xs, xe, xm, "dp_flong", x); | ||
70 | } | ||
71 | |||
72 | ieee754dp ieee754dp_fulong(u64 u) | ||
73 | { | ||
74 | if ((s64) u < 0) | ||
75 | return ieee754dp_add(ieee754dp_1e63(), | ||
76 | ieee754dp_flong(u & ~(1ULL << 63))); | ||
77 | return ieee754dp_flong(u); | ||
78 | } | ||