summaryrefslogtreecommitdiff
path: root/rtl/core/alu/shifter.sv
diff options
context:
space:
mode:
Diffstat (limited to 'rtl/core/alu/shifter.sv')
-rw-r--r--rtl/core/alu/shifter.sv42
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