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Diffstat (limited to 'techlibs/common/shiftx2mux.v')
| -rw-r--r-- | techlibs/common/shiftx2mux.v | 38 |
1 files changed, 0 insertions, 38 deletions
diff --git a/techlibs/common/shiftx2mux.v b/techlibs/common/shiftx2mux.v deleted file mode 100644 index 5366d6749..000000000 --- a/techlibs/common/shiftx2mux.v +++ /dev/null @@ -1,38 +0,0 @@ -(* techmap_celltype = /*"$shift*/ "$shiftx" *) -module _80_shift_shiftx (A, B, Y); - parameter A_SIGNED = 0; - parameter B_SIGNED = 0; - parameter A_WIDTH = 1; - parameter B_WIDTH = 1; - parameter Y_WIDTH = 1; - - input [A_WIDTH-1:0] A; - input [B_WIDTH-1:0] B; - output [Y_WIDTH-1:0] Y; - - parameter [B_WIDTH-1:0] _TECHMAP_CONSTMSK_B_ = 0; - parameter [B_WIDTH-1:0] _TECHMAP_CONSTVAL_B_ = 0; - - generate - genvar i; - localparam CLOG2_Y_WIDTH = $clog2(Y_WIDTH); - - if (B_WIDTH <= CLOG2_Y_WIDTH+1) - wire _TECHMAP_FAIL_ = 1; - // In order to perform this optimisation, this $shiftx must - // only shift in units of Y_WIDTH, which we check by ensuring - // that the appropriate LSBs of B are zero - else if (_TECHMAP_CONSTMSK_B_[CLOG2_Y_WIDTH-1:0] == {CLOG2_Y_WIDTH{1'b1}} && _TECHMAP_CONSTVAL_B_[CLOG2_Y_WIDTH-1:0] != {CLOG2_Y_WIDTH{1'b0}}) - wire _TECHMAP_FAIL_ = 1; - else begin - // Halve the size of $shiftx by $mux-ing A according to - // the LSB of B, after discarding the zeroed bits - wire [(A_WIDTH+Y_WIDTH)/2-1:0] AA; - for (i = 0; i < (A_WIDTH/Y_WIDTH); i=i+2) - assign AA[(i/2)*Y_WIDTH +: Y_WIDTH] = B[CLOG2_Y_WIDTH] ? A[(i+1)*Y_WIDTH +: Y_WIDTH] : A[(i+0)*Y_WIDTH +: Y_WIDTH]; - $shiftx #(.A_SIGNED(A_SIGNED), .B_SIGNED(B_SIGNED), .A_WIDTH((A_WIDTH+Y_WIDTH)/2'd2), .B_WIDTH(B_WIDTH-1), .Y_WIDTH(Y_WIDTH)) _TECHMAP_REPLACE_ (.A(AA), .B({B[B_WIDTH-1:CLOG2_Y_WIDTH+1], {CLOG2_Y_WIDTH{1'b0}}}), .Y(Y)); - end - endgenerate -endmodule - - |