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Added min/max/abs support

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This commit is contained in:
Andreas Traber 2016-03-02 11:15:32 +01:00
parent 06144c2fbe
commit 9319fc71c1
1 changed files with 31 additions and 3 deletions
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34
alu.sv
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@ -300,13 +300,41 @@ module riscv_alu
// min/max/abs handling
logic [31:0] result_minmax;
logic sel_minmax;
logic [ 3:0] sel_minmax;
logic do_min;
logic [31:0] minmax_b;
assign minmax_b = (operator_i == `ALU_ABS) ? adder_result : operand_b_i;
assign sel_minmax = is_greater ^ ((operator_i == `ALU_MIN) || (operator_i == `ALU_MINU));
assign result_minmax = sel_minmax ? operand_a_i[31:0] : minmax_b[31:0];
assign do_min = ((operator_i == `ALU_MIN) || (operator_i == `ALU_MINU));
// the mux now handles: min, max, abs, ins
always_comb
begin
sel_minmax[3:0] = is_greater ^ {4{do_min}};
// if(operator_i == `ALU_INS)
// begin
// if(vector_mode_i == `VEC_MODE16)
// begin
// sel_minmax[1:0] = {2{vec_ext_i[0]}};
// sel_minmax[3:2] = ~{2{vec_ext_i[0]}};
// end
// else // `VEC_MODE8
// begin
// sel_minmax[0] = (vec_ext_i != 2'b00);
// sel_minmax[1] = (vec_ext_i != 2'b01);
// sel_minmax[2] = (vec_ext_i != 2'b10);
// sel_minmax[3] = (vec_ext_i != 2'b11);
// end
// end
end
assign result_minmax[31:24] = (sel_minmax[3] == 1'b1) ? operand_a_i[31:24] : minmax_b[31:24];
assign result_minmax[23:16] = (sel_minmax[2] == 1'b1) ? operand_a_i[23:16] : minmax_b[23:16];
assign result_minmax[15: 8] = (sel_minmax[1] == 1'b1) ? operand_a_i[15: 8] : minmax_b[15: 8];
assign result_minmax[ 7: 0] = (sel_minmax[0] == 1'b1) ? operand_a_i[ 7: 0] : minmax_b[ 7: 0];
//////////////////////////////////////////////////