diff options
Diffstat (limited to 'rtl/core/alu/shifter.sv')
| -rw-r--r-- | rtl/core/alu/shifter.sv | 42 |
1 files changed, 0 insertions, 42 deletions
diff --git a/rtl/core/alu/shifter.sv b/rtl/core/alu/shifter.sv deleted file mode 100644 index 1f99e99..0000000 --- a/rtl/core/alu/shifter.sv +++ /dev/null @@ -1,42 +0,0 @@ -`include "core/uarch.sv" - -module core_alu_shifter -#(parameter W=16) -( - input alu_control ctrl, - input logic[W - 1:0] base, - input logic[7:0] shift, - input logic c_in, - - output logic[W - 1:0] b, - output logic c -); - - localparam LOG = $clog2(W); - - logic[W - 1:0] b_no_c, b_shl, b_shr, b_ror; - logic[W:0] sign_mask; - logic c_shl, c_shr, c_ror; - - assign sign_mask = {(W + 1){ctrl.sign_extend & base[W - 1]}}; - assign {c_shl, b_shl} = {c_in, base} << shift; - assign {b_shr, c_shr} = {base, c_in} >> shift | ~(sign_mask >> shift); - - logic ror_cycle; - logic[LOG - 1:0] ror_shift; - logic[2 * W:0] ror_out; - - assign ror_shift = shift[LOG - 1:0]; - assign ror_cycle = |shift[7:LOG] & ~|ror_shift; - assign ror_out = {base, base, c_in} >> {ror_cycle, ror_shift}; - assign {b_ror, c_ror} = ror_out[W:0]; - - always_comb - if(ctrl.ror) - {c, b} = {c_ror, b_ror}; - else if(ctrl.shr) - {c, b} = {c_shr, b_shr[W - 1] | (ctrl.put_carry & c_in), b_shr[W - 2:0]}; - else - {c, b} = {c_shl, b_shl}; - -endmodule |
