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| author | Mrinmoy Ghosh <mrinmoy.ghosh@arm.com> | 2012-02-13 12:26:25 -0600 |
|---|---|---|
| committer | Mrinmoy Ghosh <mrinmoy.ghosh@arm.com> | 2012-02-13 12:26:25 -0600 |
| commit | 9b05e96b9efdb9cdcc4e40ef9c96b1228df7a175 (patch) | |
| tree | 54471a114f0d7bc09853bb48e8161fe5fec79d12 /src/cpu/o3/bpred_unit.hh | |
| parent | fd90c3676d94520b98a9af29af09c1f8a2858465 (diff) | |
| download | gem5-9b05e96b9efdb9cdcc4e40ef9c96b1228df7a175.tar.xz | |
BPred: Fix RAS to handle predicated call/return instructions.
Change RAS to fix issues with predicated call/return instructions.
Handled all cases in the life of a predicated call and return instruction.
Diffstat (limited to 'src/cpu/o3/bpred_unit.hh')
| -rw-r--r-- | src/cpu/o3/bpred_unit.hh | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/src/cpu/o3/bpred_unit.hh b/src/cpu/o3/bpred_unit.hh index d3ae93b38..673472b69 100644 --- a/src/cpu/o3/bpred_unit.hh +++ b/src/cpu/o3/bpred_unit.hh @@ -1,4 +1,16 @@ /* + * Copyright (c) 2011 ARM Limited + * All rights reserved + * + * The license below extends only to copyright in the software and shall + * not be construed as granting a license to any other intellectual + * property including but not limited to intellectual property relating + * to a hardware implementation of the functionality of the software + * licensed hereunder. You may use the software subject to the license + * terms below provided that you ensure that this notice is replicated + * unmodified and in its entirety in all distributions of the software, + * modified or unmodified, in source code or in binary form. + * * Copyright (c) 2004-2005 The Regents of The University of Michigan * All rights reserved. * @@ -196,7 +208,7 @@ class BPredUnit ThreadID _tid) : seqNum(seq_num), pc(instPC), RASTarget(0), RASIndex(0), tid(_tid), predTaken(pred_taken), usedRAS(0), - wasCall(0), bpHistory(bp_history) + wasCall(0), wasReturn(0), validBTB(0), bpHistory(bp_history) {} bool operator==(const PredictorHistory &entry) const { @@ -227,6 +239,10 @@ class BPredUnit /** Whether or not the instruction was a call. */ bool wasCall; + /** Whether or not the instruction was a return. */ + bool wasReturn; + /** Whether or not the instruction had a valid BTB entry. */ + bool validBTB; /** Pointer to the history object passed back from the branch * predictor. It is used to update or restore state of the * branch predictor. |