diff options
Diffstat (limited to 'src/cpu/o3/2bit_local_pred.cc')
-rw-r--r-- | src/cpu/o3/2bit_local_pred.cc | 31 |
1 files changed, 22 insertions, 9 deletions
diff --git a/src/cpu/o3/2bit_local_pred.cc b/src/cpu/o3/2bit_local_pred.cc index d9744eec7..c3fb2fdb8 100644 --- a/src/cpu/o3/2bit_local_pred.cc +++ b/src/cpu/o3/2bit_local_pred.cc @@ -1,5 +1,5 @@ /* - * Copyright (c) 2004-2005 The Regents of The University of Michigan + * Copyright (c) 2004-2006 The Regents of The University of Michigan * All rights reserved. * * Redistribution and use in source and binary forms, with or without @@ -26,6 +26,7 @@ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ +#include "base/intmath.hh" #include "base/trace.hh" #include "cpu/o3/2bit_local_pred.hh" @@ -36,17 +37,25 @@ DefaultBP::DefaultBP(unsigned _localPredictorSize, localCtrBits(_localCtrBits), instShiftAmt(_instShiftAmt) { - // Should do checks here to make sure sizes are correct (powers of 2). + if (!isPowerOf2(localPredictorSize)) { + fatal("Invalid local predictor size!\n"); + } + + localPredictorSets = localPredictorSize / localCtrBits; + + if (!isPowerOf2(localPredictorSets)) { + fatal("Invalid number of local predictor sets! Check localCtrBits.\n"); + } // Setup the index mask. - indexMask = localPredictorSize - 1; + indexMask = localPredictorSets - 1; DPRINTF(Fetch, "Branch predictor: index mask: %#x\n", indexMask); // Setup the array of counters for the local predictor. - localCtrs = new SatCounter[localPredictorSize]; + localCtrs.resize(localPredictorSets); - for (int i = 0; i < localPredictorSize; ++i) + for (int i = 0; i < localPredictorSets; ++i) localCtrs[i].setBits(_localCtrBits); DPRINTF(Fetch, "Branch predictor: local predictor size: %i\n", @@ -58,6 +67,14 @@ DefaultBP::DefaultBP(unsigned _localPredictorSize, instShiftAmt); } +void +DefaultBP::reset() +{ + for (int i = 0; i < localPredictorSets; ++i) { + localCtrs[i].reset(); + } +} + bool DefaultBP::lookup(Addr &branch_addr) { @@ -68,8 +85,6 @@ DefaultBP::lookup(Addr &branch_addr) DPRINTF(Fetch, "Branch predictor: Looking up index %#x\n", local_predictor_idx); - assert(local_predictor_idx < localPredictorSize); - local_prediction = localCtrs[local_predictor_idx].read(); DPRINTF(Fetch, "Branch predictor: prediction is %i.\n", @@ -102,8 +117,6 @@ DefaultBP::update(Addr &branch_addr, bool taken) DPRINTF(Fetch, "Branch predictor: Looking up index %#x\n", local_predictor_idx); - assert(local_predictor_idx < localPredictorSize); - if (taken) { DPRINTF(Fetch, "Branch predictor: Branch updated as taken.\n"); localCtrs[local_predictor_idx].increment(); |