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[/] [openrisc/] [trunk/] [or1200/] [rtl/] [verilog/] [or1200_alu.v] - Diff between revs 643 and 674

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Rev 643 Rev 674
Line 129... Line 129... 
assign a_eq_b = !(|result_sum);
 
assign a_eq_b = !(|result_sum);
 
// signed compare when comp_op[3] is set
 
// signed compare when comp_op[3] is set
 
assign a_lt_b = comp_op[3] ? ((a[width-1] & !b[width-1]) |
 
assign a_lt_b = comp_op[3] ? ((a[width-1] & !b[width-1]) |
 
                              (!a[width-1] & !b[width-1] & result_sum[width-1])|
 
                              (!a[width-1] & !b[width-1] & result_sum[width-1])|
 
                              (a[width-1] & b[width-1] & result_sum[width-1])):
 
                              (a[width-1] & b[width-1] & result_sum[width-1])):
 
// a < b if (a - b) subtraction wrapped and a[width-1] wasn't set
 
                (a < b);
 
                (result_sum[width-1] & !a[width-1]) |
 
 
 
// or if (a - b) wrapped and both a[width-1] and b[width-1] were set
 
 
 
                (result_sum[width-1] & a[width-1] & b[width-1] );
 
 
 
`endif
 
`endif
 
 
 
 
 
`ifdef OR1200_IMPL_SUB
 
`ifdef OR1200_IMPL_SUB
 
 `ifdef OR1200_IMPL_ALU_COMP3
 
 `ifdef OR1200_IMPL_ALU_COMP3
 
assign cy_sub = a_lt_b;
 
assign cy_sub = a_lt_b;

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