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This commit is contained in:
Ross Thompson 2022-03-10 18:50:03 -06:00
parent 6d914def08
commit 257015a2df
2 changed files with 30 additions and 30 deletions
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3
pipelined/src/lsu/lsu.sv
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@ -270,8 +270,7 @@ module lsu (
end
subwordwrite subwordwrite(.LSUPAdrM(LSUPAdrM[2:0]),
.HSIZED({LSUFunct3M[2], 1'b0, LSUFunct3M[1:0]}),
.HWDATAIN(FinalAMOWriteDataM), .HWDATA(FinalWriteDataM), .ByteMaskM);
.LSUFunct3M, .FinalAMOWriteDataM, .FinalWriteDataM, .ByteMaskM);
endmodule

57
pipelined/src/lsu/subwordwrite.sv
View File

@ -32,54 +32,55 @@
module subwordwrite (
input logic [2:0] LSUPAdrM,
input logic [3:0] HSIZED,
input logic [`XLEN-1:0] HWDATAIN,
output logic [`XLEN-1:0] HWDATA,
input logic [2:0] LSUFunct3M,
input logic [`XLEN-1:0] FinalAMOWriteDataM,
output logic [`XLEN-1:0] FinalWriteDataM,
output logic [`XLEN/8-1:0] ByteMaskM
);
logic [`XLEN-1:0] WriteDataSubwordDuplicated;
swbytemask swbytemask(.HSIZED, .HADDRD(LSUPAdrM), .ByteMask(ByteMaskM));
swbytemask swbytemask(.HSIZED({LSUFunct3M[2], 1'b0, LSUFunct3M[1:0]}), .HADDRD(LSUPAdrM),
.ByteMask(ByteMaskM));
if (`XLEN == 64) begin:sww
// Handle subword writes
always_comb
case(HSIZED[1:0])
2'b00: WriteDataSubwordDuplicated = {8{HWDATAIN[7:0]}}; // sb
2'b01: WriteDataSubwordDuplicated = {4{HWDATAIN[15:0]}}; // sh
2'b10: WriteDataSubwordDuplicated = {2{HWDATAIN[31:0]}}; // sw
2'b11: WriteDataSubwordDuplicated = HWDATAIN; // sw
case(LSUFunct3M[1:0])
2'b00: WriteDataSubwordDuplicated = {8{FinalAMOWriteDataM[7:0]}}; // sb
2'b01: WriteDataSubwordDuplicated = {4{FinalAMOWriteDataM[15:0]}}; // sh
2'b10: WriteDataSubwordDuplicated = {2{FinalAMOWriteDataM[31:0]}}; // sw
2'b11: WriteDataSubwordDuplicated = FinalAMOWriteDataM; // sw
endcase
always_comb begin
HWDATA='0;
if (ByteMaskM[0]) HWDATA[7:0] = WriteDataSubwordDuplicated[7:0];
if (ByteMaskM[1]) HWDATA[15:8] = WriteDataSubwordDuplicated[15:8];
if (ByteMaskM[2]) HWDATA[23:16] = WriteDataSubwordDuplicated[23:16];
if (ByteMaskM[3]) HWDATA[31:24] = WriteDataSubwordDuplicated[31:24];
if (ByteMaskM[4]) HWDATA[39:32] = WriteDataSubwordDuplicated[39:32];
if (ByteMaskM[5]) HWDATA[47:40] = WriteDataSubwordDuplicated[47:40];
if (ByteMaskM[6]) HWDATA[55:48] = WriteDataSubwordDuplicated[55:48];
if (ByteMaskM[7]) HWDATA[63:56] = WriteDataSubwordDuplicated[63:56];
FinalWriteDataM='0;
if (ByteMaskM[0]) FinalWriteDataM[7:0] = WriteDataSubwordDuplicated[7:0];
if (ByteMaskM[1]) FinalWriteDataM[15:8] = WriteDataSubwordDuplicated[15:8];
if (ByteMaskM[2]) FinalWriteDataM[23:16] = WriteDataSubwordDuplicated[23:16];
if (ByteMaskM[3]) FinalWriteDataM[31:24] = WriteDataSubwordDuplicated[31:24];
if (ByteMaskM[4]) FinalWriteDataM[39:32] = WriteDataSubwordDuplicated[39:32];
if (ByteMaskM[5]) FinalWriteDataM[47:40] = WriteDataSubwordDuplicated[47:40];
if (ByteMaskM[6]) FinalWriteDataM[55:48] = WriteDataSubwordDuplicated[55:48];
if (ByteMaskM[7]) FinalWriteDataM[63:56] = WriteDataSubwordDuplicated[63:56];
end
end else begin:sww // 32-bit
// Handle subword writes
always_comb
case(HSIZED[1:0])
2'b00: WriteDataSubwordDuplicated = {4{HWDATAIN[7:0]}}; // sb
2'b01: WriteDataSubwordDuplicated = {2{HWDATAIN[15:0]}}; // sh
2'b10: WriteDataSubwordDuplicated = HWDATAIN; // sw
default: WriteDataSubwordDuplicated = HWDATAIN; // shouldn't happen
case(LSUFunct3M[1:0])
2'b00: WriteDataSubwordDuplicated = {4{FinalAMOWriteDataM[7:0]}}; // sb
2'b01: WriteDataSubwordDuplicated = {2{FinalAMOWriteDataM[15:0]}}; // sh
2'b10: WriteDataSubwordDuplicated = FinalAMOWriteDataM; // sw
default: WriteDataSubwordDuplicated = FinalAMOWriteDataM; // shouldn't happen
endcase
always_comb begin
HWDATA='0;
if (ByteMaskM[0]) HWDATA[7:0] = WriteDataSubwordDuplicated[7:0];
if (ByteMaskM[1]) HWDATA[15:8] = WriteDataSubwordDuplicated[15:8];
if (ByteMaskM[2]) HWDATA[23:16] = WriteDataSubwordDuplicated[23:16];
if (ByteMaskM[3]) HWDATA[31:24] = WriteDataSubwordDuplicated[31:24];
FinalWriteDataM='0;
if (ByteMaskM[0]) FinalWriteDataM[7:0] = WriteDataSubwordDuplicated[7:0];
if (ByteMaskM[1]) FinalWriteDataM[15:8] = WriteDataSubwordDuplicated[15:8];
if (ByteMaskM[2]) FinalWriteDataM[23:16] = WriteDataSubwordDuplicated[23:16];
if (ByteMaskM[3]) FinalWriteDataM[31:24] = WriteDataSubwordDuplicated[31:24];
end
end