Identified bug in the IFU which selects PCNextF when InvalidateICacheM is true. If the ID is invalid PCNextF should NOT be PCE.

2021-12-20 23:45:55 -06:00 · 2021-12-20 23:45:55 -06:00 · 3f62a64056
commit 3f62a64056
parent a157235a4b
1 changed files with 1 additions and 0 deletions
--- a/wally-pipelined/src/ifu/ifu.sv
+++ b/wally-pipelined/src/ifu/ifu.sv
@ -187,6 +187,7 @@ module ifu (
         .s(BPPredWrongE),
         .y(PCNext1F));

+  // *** December 20, 2021 BUG Ross Thompson, If instructions in ID and IF are already invalid we don't pick PCE on icache invalidate.
  mux2 #(`XLEN) pcmux2(.d0(PCNext1F),
         .d1(PCE),
         .s(InvalidateICacheM),