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using onehot multiplexer to reduce critical path

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This commit is contained in:
Blaise Tine
2021-07-08 00:26:59 -07:00
parent dc34c5c5bd
commit 10e9ee124b
11 changed files with 161 additions and 207 deletions
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8
hw/rtl/VX_decode.v
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@@ -53,6 +53,8 @@ module VX_decode #(
wire [19:0] upper_imm = {func7, rs2, rs1, func3};
wire [11:0] alu_imm = (func3[0] && ~func3[1]) ? {{7{1'b0}}, rs2} : u_12;
wire [11:0] s_imm = {func7, rd};
wire [12:0] b_imm = {instr[31], instr[7], instr[30:25], instr[11:8], 1'b0};
wire [20:0] jal_imm = {instr[31], instr[19:12], instr[20], instr[30:21], 1'b0};
wire [11:0] jalr_imm = {func7, rs2};
@@ -70,7 +72,7 @@ module VX_decode #(
use_PC = 0;
use_rd = 0;
is_join = 0;
is_wstall = 0;
is_wstall = 0;
used_regs = 0;
case (opcode)
@@ -184,7 +186,7 @@ module VX_decode #(
use_imm = 1;
use_PC = 1;
is_wstall = 1;
imm = {{20{instr[31]}}, instr[7], instr[30:25], instr[11:8], 1'b0};
imm = {{19{b_imm[12]}}, b_imm};
`USED_IREG (rs1);
`USED_IREG (rs2);
end
@@ -245,7 +247,7 @@ module VX_decode #(
`INST_S: begin
ex_type = `EX_LSU;
op_type = `OP_BITS'({1'b1, func3});
imm = {{20{func7[6]}}, func7, rd};
imm = {{20{s_imm[6]}}, s_imm};
`USED_IREG (rs1);
`ifdef EXT_F_ENABLE
if (opcode[2]) begin