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Remove TWO_CYCLE_COMPARE.

This commit is contained in:
colin.liang 2023-01-12 17:35:47 +08:00
parent bb0bf253eb
commit b5edff85f7
1 changed files with 8 additions and 24 deletions
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32
picorv32.v
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@ -45,7 +45,6 @@
module picorv32 #(
parameter [0:0] TWO_STAGE_SHIFT = 1,
parameter [0:0] BARREL_SHIFTER = 0,
parameter [0:0] TWO_CYCLE_COMPARE = 0,
parameter [0:0] ENABLE_TRACE = 0,
parameter [31:0] MASKED_IRQ = 32'h0000_0000,
parameter [31:0] LATCHED_IRQ = 32'hffff_ffff,
@ -810,7 +809,6 @@ module picorv32 #(
reg [31:0] alu_out, alu_out_q;
reg alu_out_0, alu_out_0_q;
reg alu_wait, alu_wait_2; // AAAA
reg [31:0] alu_add_sub;
reg [31:0] alu_shl, alu_shr;
@ -833,10 +831,8 @@ module picorv32 #(
instr_bne: alu_out_0 = !alu_eq;
instr_bge: alu_out_0 = !alu_lts;
instr_bgeu: alu_out_0 = !alu_ltu;
is_slti_blt_slt && (!TWO_CYCLE_COMPARE || !{instr_beq, instr_bne, instr_bge, instr_bgeu}):
alu_out_0 = alu_lts;
is_sltiu_bltu_sltu && (!TWO_CYCLE_COMPARE || !{instr_beq, instr_bne, instr_bge, instr_bgeu}):
alu_out_0 = alu_ltu;
is_slti_blt_slt: alu_out_0 = alu_lts;
is_sltiu_bltu_sltu: alu_out_0 = alu_ltu;
endcase
alu_out = 'bx;
@ -922,9 +918,6 @@ module picorv32 #(
alu_out_0_q <= alu_out_0;
alu_out_q <= alu_out;
alu_wait <= 0;
alu_wait_2 <= 0;
if (launch_next_insn) begin
dbg_rs1val <= 'bx;
dbg_rs2val <= 'bx;
@ -1206,10 +1199,7 @@ module picorv32 #(
cpu_state <= cpu_state_shift;
end
default: begin
if (TWO_CYCLE_COMPARE && is_beq_bne_blt_bge_bltu_bgeu) begin
alu_wait_2 <= 0; // AAAA
alu_wait <= 1;
end else mem_do_rinst <= mem_do_prefetch;
mem_do_rinst <= mem_do_prefetch;
cpu_state <= cpu_state_exec;
end
endcase
@ -1251,10 +1241,7 @@ module picorv32 #(
cpu_state <= cpu_state_shift;
end
default: begin
if ((TWO_CYCLE_COMPARE && is_beq_bne_blt_bge_bltu_bgeu)) begin
alu_wait_2 <= 0; // AAAA
alu_wait <= 1;
end else mem_do_rinst <= mem_do_prefetch;
mem_do_rinst <= mem_do_prefetch;
cpu_state <= cpu_state_exec;
end
endcase
@ -1262,15 +1249,12 @@ module picorv32 #(
cpu_state_exec: begin
reg_out <= reg_pc + decoded_imm;
if (TWO_CYCLE_COMPARE && (alu_wait || alu_wait_2)) begin
mem_do_rinst <= mem_do_prefetch && !alu_wait_2;
alu_wait <= alu_wait_2;
end else if (is_beq_bne_blt_bge_bltu_bgeu) begin
if (is_beq_bne_blt_bge_bltu_bgeu) begin
latched_rd <= 0;
latched_store <= TWO_CYCLE_COMPARE ? alu_out_0_q : alu_out_0;
latched_branch <= TWO_CYCLE_COMPARE ? alu_out_0_q : alu_out_0;
latched_store <= alu_out_0;
latched_branch <= alu_out_0;
if (mem_done) cpu_state <= cpu_state_fetch;
if (TWO_CYCLE_COMPARE ? alu_out_0_q : alu_out_0) begin
if (alu_out_0) begin
decoder_trigger <= 0;
set_mem_do_rinst = 1;
end