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Towards compressed ISA support

This commit is contained in:
Clifford Wolf 2015-11-18 15:55:29 +01:00
parent 061b96be55
commit 3aed9f7c65
1 changed files with 13 additions and 0 deletions
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picorv32.v
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@ -277,10 +277,18 @@ module picorv32 #(
mem_rdata_q[14:12] <= 3'b 010; mem_rdata_q[14:12] <= 3'b 010;
end end
3'b100: begin 3'b100: begin
if (mem_rdata_latched[12] == 0 && mem_rdata_latched[6:2] == 0) begin // C.JR
mem_rdata_q[14:12] <= 3'b000;
mem_rdata_q[31:20] <= 12'b0;
end
if (mem_rdata_latched[12] == 0 && mem_rdata_latched[6:2] != 0) begin // C.MV if (mem_rdata_latched[12] == 0 && mem_rdata_latched[6:2] != 0) begin // C.MV
mem_rdata_q[14:12] <= 3'b000; mem_rdata_q[14:12] <= 3'b000;
mem_rdata_q[31:25] <= 7'b0000000; mem_rdata_q[31:25] <= 7'b0000000;
end end
if (mem_rdata_latched[12] != 0 && mem_rdata_latched[11:7] != 0 && mem_rdata_latched[6:2] == 0) begin // C.JALR
mem_rdata_q[14:12] <= 3'b000;
mem_rdata_q[31:20] <= 12'b0;
end
end end
3'b110: begin // C.SWSP 3'b110: begin // C.SWSP
{mem_rdata_q[31:25], mem_rdata_q[11:7]} <= {mem_rdata_latched[8:7], mem_rdata_latched[12:9], 2'b00}; {mem_rdata_q[31:25], mem_rdata_q[11:7]} <= {mem_rdata_latched[8:7], mem_rdata_latched[12:9], 2'b00};
@ -574,6 +582,11 @@ module picorv32 #(
decoded_rs1 <= 0; decoded_rs1 <= 0;
decoded_rs2 <= mem_rdata_latched[6:2]; decoded_rs2 <= mem_rdata_latched[6:2];
end end
if (mem_rdata_latched[12] != 0 && mem_rdata_latched[11:7] != 0 && mem_rdata_latched[6:2] == 0) begin // C.JALR
instr_jalr <= 1;
decoded_rd <= 1;
decoded_rs1 <= mem_rdata_latched[11:7];
end
end end
3'b110: begin // C.SWSP 3'b110: begin // C.SWSP
is_sb_sh_sw <= 1; is_sb_sh_sw <= 1;