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| Rev 504 |
Rev 619 |
| Line 125... |
Line 125... |
assign a_eq_b = (comp_a == comp_b);
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assign a_eq_b = (comp_a == comp_b);
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assign a_lt_b = (comp_a < comp_b);
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assign a_lt_b = (comp_a < comp_b);
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`endif
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`endif
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`ifdef OR1200_IMPL_ALU_COMP3
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`ifdef OR1200_IMPL_ALU_COMP3
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assign a_eq_b = !(|result_sum);
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assign a_eq_b = !(|result_sum);
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// signed compare when comp_op[3] is set
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assign a_lt_b = comp_op[3] ? ((a[width-1] & !b[width-1]) |
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assign a_lt_b = comp_op[3] ? ((a[width-1] & !b[width-1]) |
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(!a[width-1] & !b[width-1] & result_sum[width-1])|
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(!a[width-1] & !b[width-1] & result_sum[width-1])|
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(a[width-1] & b[width-1] & result_sum[width-1])):
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(a[width-1] & b[width-1] & result_sum[width-1])):
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result_sum[width-1];
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// a < b if (a - b) subtraction wrapped and a[width-1] wasn't set
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(result_sum[width-1] & !a[width-1]) |
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// or if (a - b) wrapped and both a[width-1] and b[width-1] were set
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(result_sum[width-1] & a[width-1] & b[width-1] );
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`endif
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`endif
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`ifdef OR1200_IMPL_SUB
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`ifdef OR1200_IMPL_SUB
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`ifdef OR1200_IMPL_ALU_COMP3
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`ifdef OR1200_IMPL_ALU_COMP3
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assign cy_sub = a_lt_b;
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assign cy_sub = a_lt_b;
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