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zbb handles sign

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Kevin Kim 2023-02-05 16:50:13 +00:00
parent 2edcb9d842
commit 95c91e4661
2 changed files with 22 additions and 15 deletions
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7
pipelined/src/ieu/ext.sv
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@ -32,13 +32,12 @@
module ext #(parameter WIDTH = 32) ( module ext #(parameter WIDTH = 32) (
input logic [WIDTH-1:0] A, // Operand input logic [WIDTH-1:0] A, // Operand
input logic W64, // Indicates word operation
output logic [WIDTH-1:0] sexthResult, // sign extend halfword result output logic [WIDTH-1:0] sexthResult, // sign extend halfword result
output logic [WIDTH-1:0] sextbResult, // sign extend byte result output logic [WIDTH-1:0] sextbResult, // sign extend byte result
output logic [WIDTH-1:0] zexthResult); // zero extend halfword result output logic [WIDTH-1:0] zexthResult); // zero extend halfword result
assign sexthResult = {{(XLEN-16){A[15]}},A[15:0]}; assign sexthResult = {{(WIDTH-16){A[15]}},A[15:0]};
assign zexthResult = {{(XLEN-16){1'b0}},A[15:0]}; assign zexthResult = {{(WIDTH-16){1'b0}},A[15:0]};
assign sextbResult = {{(XLEN-8){A[7]}},A[7:0]}; assign sextbResult = {{(WIDTH-8){A[7]}},A[7:0]};
endmodule endmodule

30
pipelined/src/ieu/zbb.sv
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@ -31,26 +31,31 @@
`include "wally-config.vh" `include "wally-config.vh"
module zbb #(parameter WIDTH=32) ( module zbb #(parameter WIDTH=32) (
input logic [WIDTH-1:0] A, B, // Operands input logic [WIDTH-1:0] A, B, // Operands
input logic [2:0] Funct3, // Indicates operation to perform input logic [2:0] Funct3, // Indicates operation to perform
input logic [6:0] Funct7, // Indicates operation to perform input logic [6:0] Funct7, // Indicates operation to perform
input logic W64, // Indicates word operation input logic W64, // Indicates word operation
output logic [WIDTH-1:0] ZBBResult); // ZBB result output logic [WIDTH-1:0] ZBBResult); // ZBB result
//count results // count results
logic [WIDTH-1:0] clzResult; // leading zeros result logic [WIDTH-1:0] clzResult; // leading zeros result
logic [WIDTH-1:0] ctzResult; // trailing zeros result logic [WIDTH-1:0] ctzResult; // trailing zeros result
logic [WIDTH-1:0] cpopResult; // population count result logic [WIDTH-1:0] cpopResult; // population count result
//byte results // byte results
logic [WIDTH-1:0] OrcBResult; logic [WIDTH-1:0] OrcBResult;
logic [WIDTH-1:0] Rev8Result; logic [WIDTH-1:0] Rev8Result;
cnt cnt(.A(A), .W64(W64), .clzResult(clzResult), .ctzResult(ctzResult), .cpopResult(cpopResult)); // sign/zero extend results
logic [WIDTH-1:0] sexthResult; // sign extend halfword result
logic [WIDTH-1:0] sextbResult; // sign extend byte result
logic [WIDTH-1:0] zexthResult; // zero extend halfword result
cnt cnt(.A(A), .W64(W64), .clzResult(clzResult), .ctzResult(ctzResult), .cpopResult(cpopResult));
byteUnit bu(.A(A), .OrcBResult(OrcBResult), .Rev8Result(Rev8Result)); byteUnit bu(.A(A), .OrcBResult(OrcBResult), .Rev8Result(Rev8Result));
ext ext(.A(A), .sexthResult(sexthResult), .sextbResult(sextbResult), .zexthResult(zexthResult));
//can replace with structural mux by looking at bit 4 in rs2 field //can replace with structural mux by looking at bit 4 in rs2 field
always_comb begin always_comb begin
@ -63,6 +68,9 @@ module zbb #(parameter WIDTH=32) (
15'b0110000_001_00001: ZBBResult = ctzResult; 15'b0110000_001_00001: ZBBResult = ctzResult;
15'b0110101_101_11000: ZBBResult = Rev8Result; 15'b0110101_101_11000: ZBBResult = Rev8Result;
15'b0110101_101_11000: ZBBResult = Rev8Result; 15'b0110101_101_11000: ZBBResult = Rev8Result;
15'b0000100_100_00000: ZBBResult = zexthResult;
15'b0110000_001_00100: ZBBResult = sextbResult;
15'b0110000_001_00101: ZBBResult = sexthResult;
endcase endcase
end end