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author | Kevin Lim <ktlim@umich.edu> | 2005-03-10 15:53:27 -0500 |
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committer | Kevin Lim <ktlim@umich.edu> | 2005-03-10 15:53:27 -0500 |
commit | c12a665c3120b61ed4e09da5d8a52c57406763d5 (patch) | |
tree | b5176be0d526ea24cafcd6f615058651f2b34dfb /cpu/beta_cpu/btb.hh | |
parent | aa8c9db159422a313f6dfc9a76fd827515b32126 (diff) | |
parent | 51108a8c0a3a42702f49a945f8a4dac776a8d189 (diff) | |
download | gem5-c12a665c3120b61ed4e09da5d8a52c57406763d5.tar.xz |
Merge ktlim@zizzer.eecs.umich.edu:/bk/m5
into zamp.eecs.umich.edu:/z/ktlim2/m5
--HG--
extra : convert_revision : a58535776cf5a3d17f8d9f65144cdf8db54289aa
Diffstat (limited to 'cpu/beta_cpu/btb.hh')
-rw-r--r-- | cpu/beta_cpu/btb.hh | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/cpu/beta_cpu/btb.hh b/cpu/beta_cpu/btb.hh new file mode 100644 index 000000000..81069eabe --- /dev/null +++ b/cpu/beta_cpu/btb.hh @@ -0,0 +1,52 @@ +#ifndef __BTB_HH__ +#define __BTB_HH__ + +// For Addr type. +#include "arch/alpha/isa_traits.hh" + +class DefaultBTB +{ + private: + struct BTBEntry + { + BTBEntry() + : tag(0), target(0), valid(false) + { + } + + Addr tag; + Addr target; + bool valid; + }; + + public: + DefaultBTB(unsigned numEntries, unsigned tagBits, + unsigned instShiftAmt); + + Addr lookup(const Addr &inst_PC); + + bool valid(const Addr &inst_PC); + + void update(const Addr &inst_PC, const Addr &target_PC); + + private: + inline unsigned getIndex(const Addr &inst_PC); + + inline Addr getTag(const Addr &inst_PC); + + BTBEntry *btb; + + unsigned numEntries; + + unsigned idxMask; + + unsigned tagBits; + + unsigned tagMask; + + unsigned instShiftAmt; + + unsigned tagShiftAmt; +}; + +#endif // __BTB_HH__ |