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using onehot multiplexer to reduce critical path

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Blaise Tine
2021-07-08 00:26:59 -07:00
parent dc34c5c5bd
commit 10e9ee124b
11 changed files with 161 additions and 207 deletions
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13
hw/rtl/VX_alu_unit.v
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@@ -51,20 +51,17 @@ module VX_alu_unit #(
for (genvar i = 0; i < `NUM_THREADS; i++) begin
wire [32:0] shr_in1 = {alu_signed & alu_in1[i][31], alu_in1[i]};
`IGNORE_WARNINGS_BEGIN
wire [32:0] shr_value = $signed(shr_in1) >>> alu_in2_imm[i][4:0];
`IGNORE_WARNINGS_END
assign shr_result[i] = shr_value[31:0];
assign shr_result[i] = 32'($signed(shr_in1) >>> alu_in2_imm[i][4:0]);
end
for (genvar i = 0; i < `NUM_THREADS; i++) begin
always @(*) begin
case (alu_op)
`ALU_AND: msc_result[i] = alu_in1[i] & alu_in2_imm[i];
`ALU_OR: msc_result[i] = alu_in1[i] | alu_in2_imm[i];
`ALU_XOR: msc_result[i] = alu_in1[i] ^ alu_in2_imm[i];
`ALU_AND: msc_result[i] = alu_in1[i] & alu_in2_imm[i];
`ALU_OR: msc_result[i] = alu_in1[i] | alu_in2_imm[i];
`ALU_XOR: msc_result[i] = alu_in1[i] ^ alu_in2_imm[i];
//`ALU_SLL,
default: msc_result[i] = alu_in1[i] << alu_in2_imm[i][4:0];
default: msc_result[i] = alu_in1[i] << alu_in2_imm[i][4:0];
endcase
end
end