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author | Andrea Mondelli <Andrea.Mondelli@ucf.edu> | 2019-03-01 09:38:18 -0500 |
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committer | Andrea Mondelli <Andrea.Mondelli@ucf.edu> | 2019-03-14 15:09:07 +0000 |
commit | 8cedf1df11f7de007fddd24a6f313eb875ebd1e8 (patch) | |
tree | fd34c0d80c02a19e602eed9ce09cbd475220f811 /src/cpu/reg_class.hh | |
parent | 7f9cbfae9a091363ec46102cc3e693ac94b51493 (diff) | |
download | gem5-8cedf1df11f7de007fddd24a6f313eb875ebd1e8.tar.xz |
cpu: Refactor of Physical Register implementation
The implementation of the PhyRegId class is shared between multiple
cpu models. The o3/misc.hh should only be included in o3 models.
This patch removes the dependencies between different model
implementations, allowing to add new O3-like CPU model.
Change-Id: Ibb812517043befe75c48fab3ce9605a0d272870b
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/16908
Reviewed-by: Anthony Gutierrez <anthony.gutierrez@amd.com>
Reviewed-by: Bradley Wang <radwang@ucdavis.edu>
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
Diffstat (limited to 'src/cpu/reg_class.hh')
-rw-r--r-- | src/cpu/reg_class.hh | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/src/cpu/reg_class.hh b/src/cpu/reg_class.hh index 70cfab39e..63a6c86a3 100644 --- a/src/cpu/reg_class.hh +++ b/src/cpu/reg_class.hh @@ -208,6 +208,105 @@ class RegId { } }; +/** Physical register index type. + * Although the Impl might be a better for this, but there are a few classes + * that need this typedef yet are not templated on the Impl. + */ +using PhysRegIndex = short int; + +/** Physical register ID. + * Like a register ID but physical. The inheritance is private because the + * only relationship between this types is functional, and it is done to + * prevent code replication. */ +class PhysRegId : private RegId { + private: + PhysRegIndex flatIdx; + + public: + explicit PhysRegId() : RegId(IntRegClass, -1), flatIdx(-1) {} + + /** Scalar PhysRegId constructor. */ + explicit PhysRegId(RegClass _regClass, PhysRegIndex _regIdx, + PhysRegIndex _flatIdx) + : RegId(_regClass, _regIdx), flatIdx(_flatIdx) + {} + + /** Vector PhysRegId constructor (w/ elemIndex). */ + explicit PhysRegId(RegClass _regClass, PhysRegIndex _regIdx, + ElemIndex elem_idx, PhysRegIndex flat_idx) + : RegId(_regClass, _regIdx, elem_idx), flatIdx(flat_idx) { } + + /** Visible RegId methods */ + /** @{ */ + using RegId::index; + using RegId::classValue; + using RegId::isZeroReg; + using RegId::className; + using RegId::elemIndex; + /** @} */ + /** + * Explicit forward methods, to prevent comparisons of PhysRegId with + * RegIds. + */ + /** @{ */ + bool operator<(const PhysRegId& that) const { + return RegId::operator<(that); + } + + bool operator==(const PhysRegId& that) const { + return RegId::operator==(that); + } + + bool operator!=(const PhysRegId& that) const { + return RegId::operator!=(that); + } + /** @} */ + + /** @return true if it is an integer physical register. */ + bool isIntPhysReg() const { return isIntReg(); } + + /** @return true if it is a floating-point physical register. */ + bool isFloatPhysReg() const { return isFloatReg(); } + + /** @Return true if it is a condition-code physical register. */ + bool isCCPhysReg() const { return isCCReg(); } + + /** @Return true if it is a vector physical register. */ + bool isVectorPhysReg() const { return isVecReg(); } + + /** @Return true if it is a vector element physical register. */ + bool isVectorPhysElem() const { return isVecElem(); } + + /** @return true if it is a vector predicate physical register. */ + bool isVecPredPhysReg() const { return isVecPredReg(); } + + /** @Return true if it is a condition-code physical register. */ + bool isMiscPhysReg() const { return isMiscReg(); } + + /** + * Returns true if this register is always associated to the same + * architectural register. + */ + bool isFixedMapping() const + { + return !isRenameable(); + } + + /** Flat index accessor */ + const PhysRegIndex& flatIndex() const { return flatIdx; } + + static PhysRegId elemId(const PhysRegId* vid, ElemIndex elem) + { + assert(vid->isVectorPhysReg()); + return PhysRegId(VecElemClass, vid->index(), elem); + } +}; + +/** Constant pointer definition. + * PhysRegIds only need to be created once and then we can just share + * pointers */ +using PhysRegIdPtr = const PhysRegId*; + namespace std { template<> |