peepopt - collection of peephole optimizers¶
- yosys> help peepopt¶
peepopt [options] [selection]
This pass applies a collection of peephole optimizers to the current design. This pass employs the following rules: * muldiv - Replace (A*B)/B with A * shiftmul - Replace A>>(B*C) with A'>>(B<<K) where C and K are constants and A' is derived from A by appropriately inserting padding into the signal. (right variant) Analogously, replace A<<(B*C) with appropriate selection of output bits from A<<(B<<K). (left variant) * shiftadd - Replace A>>(B+D) with (A'>>D)>>(B) where D is constant and A' is derived from A by padding or cutting inaccessible bits.