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📝 Add some further comments on resolved branches

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This commit is contained in:
Florian Zaruba 2017-05-09 18:49:34 +02:00
parent fac352baaf
commit 6b9ba5b314
1 changed files with 6 additions and 1 deletions
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7
src/id_stage.sv
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@ -74,8 +74,9 @@ module id_stage #(
output scoreboard_entry commit_instr_o,
input logic commit_ack_i
);
// ---------------------------------------------------
// Global signals
// ---------------------------------------------------
logic full;
// ---------------------------------------------------
// Scoreboard (SB) <-> Issue and Read Operands (iro)
@ -102,6 +103,10 @@ module id_stage #(
// -----------------
// Branch logic
// -----------------
// This should basically prevent the scoreboard from accepting
// instructions past a branch. We need to resolve the branch beforehand.
// This limitation is in place to ease the backtracking of mis-predicted branches as they
// can simply be in the front-end of the processor.
logic unresolved_branch_n, unresolved_branch_q;
always_comb begin : unresolved_branch