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Towards compressed ISA support

This commit is contained in:
Clifford Wolf 2015-11-18 19:23:11 +01:00
parent 3aed9f7c65
commit c4e711209c
1 changed files with 13 additions and 2 deletions
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15
picorv32.v
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@ -236,6 +236,12 @@ module picorv32 #(
if (COMPRESSED_ISA && mem_do_rinst) begin if (COMPRESSED_ISA && mem_do_rinst) begin
case (mem_rdata_latched[1:0]) case (mem_rdata_latched[1:0])
2'b00: begin // Quadrant 0 2'b00: begin // Quadrant 0
case (mem_rdata_latched[15:13])
3'b 110: begin // C.SW
{mem_rdata_q[31:25], mem_rdata_q[11:7]} <= {mem_rdata_latched[5], mem_rdata_latched[12:10], mem_rdata_latched[6], 2'b00};
mem_rdata_q[14:12] <= 3'b 010;
end
endcase
end end
2'b01: begin // Quadrant 1 2'b01: begin // Quadrant 1
case (mem_rdata_latched[15:13]) case (mem_rdata_latched[15:13])
@ -518,8 +524,13 @@ module picorv32 #(
case (mem_rdata_latched[1:0]) case (mem_rdata_latched[1:0])
2'b00: begin // Quadrant 0 2'b00: begin // Quadrant 0
decoded_rs1 <= 8 + mem_rdata_latched[9:7]; case (mem_rdata_latched[15:13])
decoded_rd <= 8 + mem_rdata_latched[4:2]; 3'b110: begin // C.SW
is_sb_sh_sw <= 1;
decoded_rs1 <= 8 + mem_rdata_latched[9:7];
decoded_rs2 <= 8 + mem_rdata_latched[4:2];
end
endcase
end end
2'b01: begin // Quadrant 1 2'b01: begin // Quadrant 1
case (mem_rdata_latched[15:13]) case (mem_rdata_latched[15:13])