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🐛 Fix branch prediction case ending in loop

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This commit is contained in:
Florian Zaruba 2017-06-08 19:56:02 +02:00
parent e1d6911c3c
commit 7173d44bb0
1 changed files with 3 additions and 2 deletions
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5
src/pcgen.sv
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@ -82,13 +82,14 @@ module pcgen (
npc_n = {npc_q[62:2], 2'b0} + 64'h4;
else // or keep the PC stable if IF is not ready
npc_n = npc_q;
// we only need to stall the consecutive case since in any other case we will flush at least
// we only need to stall the consecutive and predicted case since in any other case we will flush at least
// the front-end which means that the IF stage will always be ready to accept a new request
// -------------------------------
// 1. Predict taken
// -------------------------------
if (branch_predict_btb.valid && branch_predict_btb.predict_taken) begin
// only predict if the IF stage is ready, otherwise we might take the predicted PC away which will end in a endless loop
if (if_ready_i && branch_predict_btb.valid && branch_predict_btb.predict_taken) begin
npc_n = branch_predict_btb.predict_address;
end
// -------------------------------