kaltinsoy/LF-Build-RISCV
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

aluAdded

Browse Source
This commit is contained in:
kaltinsoy
2025-08-22 07:14:22 +03:00
parent e39daed967
commit a40879f631
1 changed files with 63 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

70
chapter5/RISCcore2.v
View File

@@ -85,20 +85,76 @@ module RISCcore2 (
wire isSRA = (isRType) && (funct3 == 3'b101) && (funct7[5] == 1'b1);
wire isSRL = (isRType) && (funct3 == 3'b101) && (funct7[5] == 1'b0);
wire isSRAI = (isIType) && (funct3 == 3'b101) && (funct7[5] == 1'b1);
wire isSLLI = (isIType) && (funct3 == 3'b001) && (funct7[5] == 1'b0);
wire isSRLI = (isIType) && (funct3 == 3'b101) && (funct7[5] == 1'b0);
//logic imms
wire isANDI = (isIType) && (funct3 == 3'b111);
wire isORI = (isIType) && (funct3 == 3'b110);
wire isXORI = (isIType) && (funct3 == 3'b100);
// logic
wire isAND = (isRType) && (funct3 == 3'b111) && (funct7[5] == 1'b0);
wire isOR = (isRType) && (funct3 == 3'b110) && (funct7[5] == 1'b0);
wire isXOR = (isRType) && (funct3 == 3'b100) && (funct7[5] == 1'b0);
wire isSUB = (isRType) && (funct3 == 3'b000) && (funct7[5] == 1'b1);
//lui auipc (opcode use)
wire isLUI = (opcode == 7'b0110111);
wire isAUIPC = (opcode == 7'b0010111);
wire isJAL = (opcode == 7'b1101111);
//jal UType
wire isJALR = (opcode == 7'b1100111) && (funct3 == 3'b000);
// ALU operations
wire [31:0] alu_src2 = isADDI ? Iimm : rs2_val;
wire [31:0] alu_result = (isADDI || isADD) ? (rs1_val + alu_src2) : 32'b0;
//sltu and slt
wire [31:0] sltu_rslt = {31'b0, (rs1_val < rs2_val)};
wire [31:0] signed_slt = (rs1_val[31] && !rs2_val[31]) ? 1'b1 :
(!rs1_val[31] && rs2_val[31]) ? 1'b0 :
(rs1_val < rs2_val);
wire [31:0] slt_rslt = {31'b0, signed_slt};
wire [31:0] slti_rslt = ((rs1_val[31] == Iimm[31]) ? sltu_rslt : {31'b0, rs1_val[31]});
wire [63:0] SErs1_val = {32{rs1_val[31]}, (rs1_val < rs2_val)};
wire [63:0] sra_rslt = {SErs1_val >> rs2_val[4:0]};
wire [63:0] srai_rslt = {SErs1_val >> Iimm[4:0]};
wire [31:0] sltiu_rslt = {31'b0, (rs1_val < Iimm)};
wire [31:0] alu_result = (isADDI) ? (rs1_val + Iimm) :
(isADD) ? (rs1_val + rs2_val) :
(isSLT) ? slt_rslt :
(isSLTU) ? sltu_rslt :
(isSRA) ? sra_rslt :
(isSRAI) ? srai_rslt :
(isSLTI) ? slti_rslt :
(isANDI) ? (rs1_val & Iimm) :
(isORI) ? (rs1_val | Iimm) :
(isXORI) ? (rs1_val ^ Iimm) :
(isSLLI) ? (rs1_val << Iimm[5:0]) :
(isSRLI) ? (rs1_val >> Iimm[5:0]) :
(isAND) ? (rs1_val & rs2_val) :
(isOR) ? (rs1_val | rs2_val) :
(isXOR) ? (rs1_val ^ rs2_val) :
(isSUB) ? (rs1_val - rs2_val) :
(isSLL) ? (rs1_val << rs2_val[4:0]) :
(isSRL) ? (rs1_val >> rs2_val[4:0]) :
(isSLTIU) ? (sltiu_rslt) :
(isLUI) ? ({Iimm[31:12], 12'b0}) :
(isAUIPC) ? (pc + Iimm) :
(isJAL) ? (pc + 32'd4) :
(isJALR) ? (pc + 32'd4) :
(isSRA) ? (sra_rslt[31:0]) :
(isSRAI) ? (srai_rslt[31:0]) :
32'b0;
// Branch condition logic
wire signed [31:0] signed_rs1 = rs1_val;
wire signed [31:0] signed_rs2 = rs2_val;
//sltu and slt
wire [31:0] sltu_rslt = {31'b0, (src)}
wire branch_taken =
isBEQ ? (rs1_val == rs2_val) :
isBNE ? (rs1_val != rs2_val) :