changeset d25827665112 in /z/repo/m5
details: http://repo.m5sim.org/m5?cmd=changeset;node=d25827665112
description:
O3: Don't test misprediction on load instructions until executed.
diffstat:
src/cpu/o3/iew_impl.hh | 6 +++++-
1 files changed, 5 insertions(+), 1 deletions(-)
diffs (16 lines):
diff -r c0be563517da -r d25827665112 src/cpu/o3/iew_impl.hh
--- a/src/cpu/o3/iew_impl.hh Tue Jan 18 16:30:05 2011 -0600
+++ b/src/cpu/o3/iew_impl.hh Tue Jan 18 16:30:05 2011 -0600
@@ -1297,7 +1297,11 @@
!toCommit->squash[tid] ||
toCommit->squashedSeqNum[tid] > inst->seqNum) {
- if (inst->mispredicted()) {
+ // Prevent testing for misprediction on load instructions,
+ // that have not been executed.
+ bool loadNotExecuted = !inst->isExecuted() && inst->isLoad();
+
+ if (inst->mispredicted() && !loadNotExecuted) {
fetchRedirect[tid] = true;
DPRINTF(IEW, "Execute: Branch mispredict detected.\n");
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