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extend unit structural mux

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This commit is contained in:
Kevin Kim 2023-03-05 15:09:02 -08:00
parent 7531bf1fd6
commit 19beed7866
2 changed files with 5 additions and 9 deletions
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12
src/ieu/bmu/ext.sv
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@ -31,21 +31,17 @@
`include "wally-config.vh"
module ext #(parameter WIDTH = 32) (
input logic [WIDTH-1:0] A, B, // Operands
input logic [WIDTH-1:0] A, // Operands
input logic [1:0] ExtSelect, // B[2], B[0] of immediate
output logic [WIDTH-1:0] ExtResult); // Extend Result
logic [WIDTH-1:0] sexthResult, zexthResult, sextbResult;
assign sexthResult = {{(WIDTH-16){A[15]}},A[15:0]};
assign zexthResult = {{(WIDTH-16){1'b0}},A[15:0]};
assign sextbResult = {{(WIDTH-8){A[7]}},A[7:0]};
always_comb
case({B[2],B[0]})
2'b00: ExtResult = zexthResult;
2'b10: ExtResult = sextbResult;
2'b11: ExtResult = sexthResult;
default: ExtResult = 0;
endcase
mux3 #(WIDTH) extmux(zexthResult, sextbResult, sexthResult, ExtSelect, ExtResult);
endmodule

2
src/ieu/bmu/zbb.sv
View File

@ -55,7 +55,7 @@ module zbb #(parameter WIDTH=32) (
cnt #(WIDTH) cnt(.A(A), .RevA(RevA), .B(B[4:0]), .W64(W64), .CntResult(CntResult));
byteUnit #(WIDTH) bu(.A(A), .ByteSelect(B[0]), .ByteResult(ByteResult));
ext #(WIDTH) ext(.A(A), .B(B), .ExtResult(ExtResult));
ext #(WIDTH) ext(.A(A), .ExtSelect({B[2], B[0]}), .ExtResult(ExtResult));
assign MaxResult = (lt) ? B : A;