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Decoder: mark instruction as valid if they excepted

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This commit is contained in:
Florian Zaruba 2017-05-04 14:40:32 +02:00
parent 749762650f
commit a5bb4c262f
1 changed files with 5 additions and 2 deletions
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7
src/decoder.sv
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@ -46,7 +46,6 @@ module decoder (
imm_select = NOIMM;
illegal_instr_o = 1'b0;
instruction_o.valid = 1'b0;
instruction_o.fu = NONE;
instruction_o.op = ADD;
instruction_o.rs1 = 5'b0;
@ -314,10 +313,14 @@ module decoder (
// Exception handling
// --------------------------------
always_comb begin : exception_handling
instruction_o.ex = ex_i;
instruction_o.ex = ex_i;
instruction_o.valid = 1'b0;
// look if we didn't already get an exception in any previous
// stage - we should not overwrite it as we retain order regarding the exception
if (~ex_i.valid && illegal_instr_o) begin
// instructions which will throw an exception are marked as valid
// e.g.: they can be committed anytime and do not need to wait for any functional unit
instruction_o.valid = 1'b1;
instruction_o.ex.valid = 1'b1;
// we decoded an illegal exception here
instruction_o.ex.cause = ILLEGAL_INSTR;