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24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | #include <softint/softint.h> |
29 | #include <genarch/softint/division.h> |
30 | 30 | ||
31 | #define ABSVAL(x) ( (x) > 0 ? (x) : -(x)) |
31 | #define ABSVAL(x) ( (x) > 0 ? (x) : -(x)) |
32 | #define SGN(x) ( (x) >= 0 ? 1 : 0 ) |
32 | #define SGN(x) ( (x) >= 0 ? 1 : 0 ) |
33 | 33 | ||
34 | static unsigned int divandmod32(unsigned int a, unsigned int b, unsigned int *remainder) |
34 | static unsigned int divandmod32(unsigned int a, unsigned int b, unsigned int *remainder) |
35 | { |
35 | { |
36 | unsigned int result; |
36 | unsigned int result; |
37 | int steps = sizeof(unsigned int); |
37 | int steps = sizeof(unsigned int) * 8; |
38 | 38 | ||
39 | *remainder = 0; |
39 | *remainder = 0; |
40 | result = 0; |
40 | result = 0; |
41 | 41 | ||
42 | if (b == 0) { |
42 | if (b == 0) { |
Line 49... | Line 49... | ||
49 | return 0; |
49 | return 0; |
50 | } |
50 | } |
51 | 51 | ||
52 | for ( ; steps > 0; steps--) { |
52 | for ( ; steps > 0; steps--) { |
53 | /* shift one bit to remainder */ |
53 | /* shift one bit to remainder */ |
54 | *remainder = ( (*remainder) << 1) | (( divident >> 31) & 0x1); |
54 | *remainder = ( (*remainder) << 1) | (( a >> 31) & 0x1); |
55 | result <<= 1; |
55 | result <<= 1; |
56 | 56 | ||
57 | if (*remainder >= b) { |
57 | if (*remainder >= b) { |
58 | *remainder -= b; |
58 | *remainder -= b; |
59 | result |= 0x1; |
59 | result |= 0x1; |
60 | } |
60 | } |
61 | divident <<= 1; |
61 | a <<= 1; |
62 | } |
62 | } |
63 | 63 | ||
64 | return result; |
64 | return result; |
65 | } |
65 | } |
66 | 66 | ||
67 | 67 | ||
68 | static unsigned long divandmod64(unsigned long a, unsigned long b, unsigned long *remainder) |
68 | static unsigned long divandmod64(unsigned long a, unsigned long b, unsigned long *remainder) |
69 | { |
69 | { |
70 | unsigned long result; |
70 | unsigned long result; |
71 | int steps = sizeof(unsigned long); |
71 | int steps = sizeof(unsigned long) * 8; |
72 | 72 | ||
73 | *remainder = 0; |
73 | *remainder = 0; |
74 | result = 0; |
74 | result = 0; |
75 | 75 | ||
76 | if (b == 0) { |
76 | if (b == 0) { |
Line 83... | Line 83... | ||
83 | return 0; |
83 | return 0; |
84 | } |
84 | } |
85 | 85 | ||
86 | for ( ; steps > 0; steps--) { |
86 | for ( ; steps > 0; steps--) { |
87 | /* shift one bit to remainder */ |
87 | /* shift one bit to remainder */ |
88 | *remainder = ( (*remainder) << 1) | (( divident >> 63) & 0x1); |
88 | *remainder = ( (*remainder) << 1) | ((a >> 63) & 0x1); |
89 | result <<= 1; |
89 | result <<= 1; |
90 | 90 | ||
91 | if (*remainder >= b) { |
91 | if (*remainder >= b) { |
92 | *remainder -= b; |
92 | *remainder -= b; |
93 | result |= 0x1; |
93 | result |= 0x1; |
94 | } |
94 | } |
95 | divident <<= 1; |
95 | a <<= 1; |
96 | } |
96 | } |
97 | 97 | ||
98 | return result; |
98 | return result; |
99 | } |
99 | } |
100 | 100 | ||
Line 140... | Line 140... | ||
140 | int __modsi3(int a, int b) |
140 | int __modsi3(int a, int b) |
141 | { |
141 | { |
142 | unsigned int rem; |
142 | unsigned int rem; |
143 | divandmod32(a, b, &rem); |
143 | divandmod32(a, b, &rem); |
144 | 144 | ||
145 | /* if divident is negative, remainder must be too*/ |
145 | /* if divident is negative, remainder must be too */ |
146 | if (!(SGN(a))) { |
146 | if (!(SGN(a))) { |
147 | return -((int)rem); |
147 | return -((int)rem); |
148 | } |
148 | } |
149 | 149 | ||
150 | return (int)rem; |
150 | return (int)rem; |
Line 154... | Line 154... | ||
154 | long __moddi3(long a, long b) |
154 | long __moddi3(long a, long b) |
155 | { |
155 | { |
156 | unsigned long rem; |
156 | unsigned long rem; |
157 | divandmod64(a, b, &rem); |
157 | divandmod64(a, b, &rem); |
158 | 158 | ||
159 | /* if divident is negative, remainder must be too*/ |
159 | /* if divident is negative, remainder must be too */ |
160 | if (!(SGN(a))) { |
160 | if (!(SGN(a))) { |
161 | return -((long)rem); |
161 | return -((long)rem); |
162 | } |
162 | } |
163 | 163 | ||
164 | return (long)rem; |
164 | return (long)rem; |