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Fix shamt decoding

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This commit is contained in:
Graham Edgecombe 2017-12-01 21:51:41 +00:00
parent ed238e5e9b
commit e7389a3065
1 changed files with 5 additions and 3 deletions
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8
rv32_decode.sv
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@ -32,6 +32,8 @@ module rv32_decode (
logic [31:0] imm_u = {sign, instr_in[30:20], instr_in[19:12], 12'b0};
logic [31:0] imm_j = {{12{sign}}, instr_in[19:12], instr_in[20], instr_in[30:25], instr_in[24:1], 1'b0};
logic [31:0] shamt = {27'b0, rs2};
rv32_regs regs (
.clk(clk),
.rs1_in(rs1),
@ -170,17 +172,17 @@ module rv32_decode (
{RV32_OPCODE_OP_IMM, RV32_FUNCT3_OP_SLL, RV32_FUNCT7_ZERO}: begin
/* SLLI */
valid <= 1;
imm_out <= imm_i;
imm_out <= shamt;
end
{RV32_OPCODE_OP_IMM, RV32_FUNCT3_OP_SRL_SRA, RV32_FUNCT7_ZERO}: begin
/* SRLI */
valid <= 1;
imm_out <= imm_i;
imm_out <= shamt;
end
{RV32_OPCODE_OP_IMM, RV32_FUNCT3_OP_SRL_SRA, RV32_FUNCT7_OP_SRA}: begin
/* SRAI */
valid <= 1;
imm_out <= imm_i;
imm_out <= shamt;
end
{RV32_OPCODE_OP, RV32_FUNCT3_OP_ADD_SUB, RV32_FUNCT7_ZERO}: begin
/* ADD */