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Last change
on this file since 97 was
81,
checked in by rosiere, 17 years ago
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- Finish Environment (and test)
- Continue predictor_unit
- Add external tools
- svn keyword "Id" set
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-
Property svn:keywords set to
Id
|
|
File size:
1.2 KB
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| 1 | #include "func_math.h" |
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| 2 | |
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| 3 | //-----[ Multiplication ]-------------------------------------------------- |
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| 4 | |
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| 5 | // Multiplication rapide |
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| 6 | unsigned int mul_soft(unsigned int op1, |
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| 7 | unsigned int op2) |
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| 8 | { |
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| 9 | unsigned int num_bit,carry; |
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| 10 | unsigned int op2_aux = op2; |
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| 11 | unsigned int res = 0; |
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| 12 | |
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| 13 | for(num_bit=0;num_bit<32; num_bit++) |
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| 14 | { |
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| 15 | if (op2_aux == 0) |
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| 16 | break; |
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| 17 | |
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| 18 | carry = op2_aux & 1; |
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| 19 | op2_aux = op2_aux >> 1; |
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| 20 | |
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| 21 | if (carry!=0) |
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| 22 | res += (op1 << num_bit); |
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| 23 | } |
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| 24 | return res; |
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| 25 | } |
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| 26 | |
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| 27 | unsigned int mul_hard(unsigned int op1, |
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| 28 | unsigned int op2) |
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| 29 | { |
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| 30 | return op1*op2; |
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| 31 | } |
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| 32 | |
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| 33 | //-----[ Division ]-------------------------------------------------------- |
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| 34 | |
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| 35 | unsigned int div_soft( unsigned int op1, |
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| 36 | unsigned int op2) |
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| 37 | { |
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| 38 | unsigned res; |
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| 39 | |
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| 40 | if (op2 == 0) |
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| 41 | return 0; |
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| 42 | |
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| 43 | for (res = 0; op1 >= op2; res ++) |
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| 44 | op1 -= op2; |
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| 45 | |
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| 46 | return res; |
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| 47 | } |
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| 48 | |
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| 49 | unsigned int div_hard( unsigned int op1, |
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| 50 | unsigned int op2) |
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| 51 | { |
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| 52 | //return (op1/op2); |
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| 53 | return div_soft(op1,op2); |
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| 54 | } |
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| 55 | |
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| 56 | //-----[ Modulo ]---------------------------------------------------------- |
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| 57 | |
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| 58 | unsigned int modulo( unsigned int x, |
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| 59 | unsigned int base) |
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| 60 | { |
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| 61 | if (base==0) |
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| 62 | return 0; |
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| 63 | |
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| 64 | while(x >= base) |
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| 65 | x -= base; |
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| 66 | |
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| 67 | return x; |
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| 68 | } |
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