aboutsummaryrefslogtreecommitdiffstats
path: root/arch/mips/math-emu/dp_tlong.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/mips/math-emu/dp_tlong.c')
-rw-r--r--arch/mips/math-emu/dp_tlong.c68
1 files changed, 26 insertions, 42 deletions
diff --git a/arch/mips/math-emu/dp_tlong.c b/arch/mips/math-emu/dp_tlong.c
index 133ce2ba0012..9cdc145b75e0 100644
--- a/arch/mips/math-emu/dp_tlong.c
+++ b/arch/mips/math-emu/dp_tlong.c
@@ -5,8 +5,6 @@
5 * MIPS floating point support 5 * MIPS floating point support
6 * Copyright (C) 1994-2000 Algorithmics Ltd. 6 * Copyright (C) 1994-2000 Algorithmics Ltd.
7 * 7 *
8 * ########################################################################
9 *
10 * This program is free software; you can distribute it and/or modify it 8 * This program is free software; you can distribute it and/or modify it
11 * under the terms of the GNU General Public License (Version 2) as 9 * under the terms of the GNU General Public License (Version 2) as
12 * published by the Free Software Foundation. 10 * published by the Free Software Foundation.
@@ -18,19 +16,21 @@
18 * 16 *
19 * You should have received a copy of the GNU General Public License along 17 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc., 18 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. 19 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
22 *
23 * ########################################################################
24 */ 20 */
25 21
26
27#include "ieee754dp.h" 22#include "ieee754dp.h"
28 23
29s64 ieee754dp_tlong(ieee754dp x) 24s64 ieee754dp_tlong(union ieee754dp x)
30{ 25{
26 u64 residue;
27 int round;
28 int sticky;
29 int odd;
30
31 COMPXDP; 31 COMPXDP;
32 32
33 CLEARCX; 33 ieee754_clearcx();
34 34
35 EXPLODEXDP; 35 EXPLODEXDP;
36 FLUSHXDP; 36 FLUSHXDP;
@@ -39,10 +39,12 @@ s64 ieee754dp_tlong(ieee754dp x)
39 case IEEE754_CLASS_SNAN: 39 case IEEE754_CLASS_SNAN:
40 case IEEE754_CLASS_QNAN: 40 case IEEE754_CLASS_QNAN:
41 case IEEE754_CLASS_INF: 41 case IEEE754_CLASS_INF:
42 SETCX(IEEE754_INVALID_OPERATION); 42 ieee754_setcx(IEEE754_INVALID_OPERATION);
43 return ieee754di_xcpt(ieee754di_indef(), "dp_tlong", x); 43 return ieee754di_indef();
44
44 case IEEE754_CLASS_ZERO: 45 case IEEE754_CLASS_ZERO:
45 return 0; 46 return 0;
47
46 case IEEE754_CLASS_DNORM: 48 case IEEE754_CLASS_DNORM:
47 case IEEE754_CLASS_NORM: 49 case IEEE754_CLASS_NORM:
48 break; 50 break;
@@ -53,18 +55,13 @@ s64 ieee754dp_tlong(ieee754dp x)
53 return -0x8000000000000000LL; 55 return -0x8000000000000000LL;
54 /* Set invalid. We will only use overflow for floating 56 /* Set invalid. We will only use overflow for floating
55 point overflow */ 57 point overflow */
56 SETCX(IEEE754_INVALID_OPERATION); 58 ieee754_setcx(IEEE754_INVALID_OPERATION);
57 return ieee754di_xcpt(ieee754di_indef(), "dp_tlong", x); 59 return ieee754di_indef();
58 } 60 }
59 /* oh gawd */ 61 /* oh gawd */
60 if (xe > DP_MBITS) { 62 if (xe > DP_FBITS) {
61 xm <<= xe - DP_MBITS; 63 xm <<= xe - DP_FBITS;
62 } else if (xe < DP_MBITS) { 64 } else if (xe < DP_FBITS) {
63 u64 residue;
64 int round;
65 int sticky;
66 int odd;
67
68 if (xe < -1) { 65 if (xe < -1) {
69 residue = xm; 66 residue = xm;
70 round = 0; 67 round = 0;
@@ -75,51 +72,38 @@ s64 ieee754dp_tlong(ieee754dp x)
75 * so we do it in two steps. Be aware that xe 72 * so we do it in two steps. Be aware that xe
76 * may be -1 */ 73 * may be -1 */
77 residue = xm << (xe + 1); 74 residue = xm << (xe + 1);
78 residue <<= 63 - DP_MBITS; 75 residue <<= 63 - DP_FBITS;
79 round = (residue >> 63) != 0; 76 round = (residue >> 63) != 0;
80 sticky = (residue << 1) != 0; 77 sticky = (residue << 1) != 0;
81 xm >>= DP_MBITS - xe; 78 xm >>= DP_FBITS - xe;
82 } 79 }
83 odd = (xm & 0x1) != 0x0; 80 odd = (xm & 0x1) != 0x0;
84 switch (ieee754_csr.rm) { 81 switch (ieee754_csr.rm) {
85 case IEEE754_RN: 82 case FPU_CSR_RN:
86 if (round && (sticky || odd)) 83 if (round && (sticky || odd))
87 xm++; 84 xm++;
88 break; 85 break;
89 case IEEE754_RZ: 86 case FPU_CSR_RZ:
90 break; 87 break;
91 case IEEE754_RU: /* toward +Infinity */ 88 case FPU_CSR_RU: /* toward +Infinity */
92 if ((round || sticky) && !xs) 89 if ((round || sticky) && !xs)
93 xm++; 90 xm++;
94 break; 91 break;
95 case IEEE754_RD: /* toward -Infinity */ 92 case FPU_CSR_RD: /* toward -Infinity */
96 if ((round || sticky) && xs) 93 if ((round || sticky) && xs)
97 xm++; 94 xm++;
98 break; 95 break;
99 } 96 }
100 if ((xm >> 63) != 0) { 97 if ((xm >> 63) != 0) {
101 /* This can happen after rounding */ 98 /* This can happen after rounding */
102 SETCX(IEEE754_INVALID_OPERATION); 99 ieee754_setcx(IEEE754_INVALID_OPERATION);
103 return ieee754di_xcpt(ieee754di_indef(), "dp_tlong", x); 100 return ieee754di_indef();
104 } 101 }
105 if (round || sticky) 102 if (round || sticky)
106 SETCX(IEEE754_INEXACT); 103 ieee754_setcx(IEEE754_INEXACT);
107 } 104 }
108 if (xs) 105 if (xs)
109 return -xm; 106 return -xm;
110 else 107 else
111 return xm; 108 return xm;
112} 109}
113
114
115u64 ieee754dp_tulong(ieee754dp x)
116{
117 ieee754dp hb = ieee754dp_1e63();
118
119 /* what if x < 0 ?? */
120 if (ieee754dp_lt(x, hb))
121 return (u64) ieee754dp_tlong(x);
122
123 return (u64) ieee754dp_tlong(ieee754dp_sub(x, hb)) |
124 (1ULL << 63);
125}