diff --git a/src/lsu/align.sv b/src/lsu/align.sv index b3a20e9b4..91eda1b8c 100644 --- a/src/lsu/align.sv +++ b/src/lsu/align.sv @@ -72,13 +72,10 @@ module align import cvw::*; #(parameter cvw_t P) ( logic [P.XLEN-1:0] IEUAdrIncrementM; - logic HalfMisalignedM, WordMisalignedM; - logic [OFFSET_BIT_POS-1:$clog2(LLENINBYTES)] WordOffsetM; - logic [$clog2(LLENINBYTES)-1:0] ByteOffsetM; - logic HalfSpillM, WordSpillM; logic [$clog2(LLENINBYTES)-1:0] AccessByteOffsetM; logic [$clog2(LLENINBYTES)+2:0] ShiftAmount; logic ValidAccess; + logic PotentialSpillM; /* verilator lint_off WIDTHEXPAND */ assign IEUAdrIncrementM = IEUAdrM + LLENINBYTES; @@ -95,36 +92,27 @@ module align import cvw::*; #(parameter cvw_t P) ( // 2) offset // 3) access location within the cacheline - assign {WordOffsetM, ByteOffsetM} = IEUAdrM[OFFSET_BIT_POS-1:0]; - always_comb begin case (Funct3M[1:0]) 2'b00: AccessByteOffsetM = '0; // byte access - 2'b01: AccessByteOffsetM = {2'b00, ByteOffsetM[0]}; // half access - 2'b10: AccessByteOffsetM = {1'b0, ByteOffsetM[1:0]}; // word access - 2'b11: AccessByteOffsetM = ByteOffsetM; // double access - default: AccessByteOffsetM = ByteOffsetM; + 2'b01: AccessByteOffsetM = {2'b00, IEUAdrM[0]}; // half access + 2'b10: AccessByteOffsetM = {1'b0, IEUAdrM[1:0]}; // word access + 2'b11: AccessByteOffsetM = IEUAdrM[2:0]; // double access + default: AccessByteOffsetM = IEUAdrM[2:0]; + endcase + case (Funct3M[1:0]) + 2'b00: PotentialSpillM = '0; // byte access + 2'b01: PotentialSpillM = IEUAdrM[OFFSET_BIT_POS-1:1] == '1; // half access + 2'b10: PotentialSpillM = IEUAdrM[OFFSET_BIT_POS-1:2] == '1; // word access + 2'b11: PotentialSpillM = IEUAdrM[OFFSET_BIT_POS-1:3] == '1; // double access + default: PotentialSpillM = '0; endcase end + assign MisalignedM = ValidAccess & (AccessByteOffsetM != '0); + assign SpillM = MisalignedM & PotentialSpillM; // compute misalignement - assign HalfMisalignedM = (ByteOffsetM[0] != '0) & Funct3M[1:0] == 2'b01; - assign WordMisalignedM = (ByteOffsetM[1:0] != '0) & Funct3M[1:0] == 2'b10; - assign HalfSpillM = (IEUAdrM[OFFSET_BIT_POS-1:1] == '1) & HalfMisalignedM; - assign WordSpillM = (IEUAdrM[OFFSET_BIT_POS-1:2] == '1) & WordMisalignedM; assign ValidAccess = (|MemRWM); - - if(P.LLEN == 64) begin - logic DoubleSpillM; - logic DoubleMisalignedM; - assign DoubleMisalignedM = (ByteOffsetM[2:0] != '0) & Funct3M[1:0] == 2'b11; - assign DoubleSpillM = (IEUAdrM[OFFSET_BIT_POS-1:3] == '1) & DoubleMisalignedM; - assign MisalignedM = ValidAccess & (HalfMisalignedM | WordMisalignedM | DoubleMisalignedM); - assign SpillM = ValidAccess & (HalfSpillM | WordSpillM | DoubleSpillM); - end else begin - assign SpillM = ValidAccess & (HalfSpillM | WordSpillM); - assign MisalignedM = ValidAccess & (HalfMisalignedM | WordMisalignedM); - end // align by shifting // Don't take the spill if there is a stall, TLB miss, or hardware update to the D/A bits