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Add isSubRegisterEq() and isSuperRegisterEq(). 

isSub and isSuper return false if RegA == RegB. Add variants which also
include the identity function.

llvm-svn: 170609
This commit is contained in:
Jim Grosbach 2012-12-19 23:38:49 +00:00
parent 74c6944a31
commit 01ab714758
1 changed files with 14 additions and 4 deletions
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18
llvm/include/llvm/MC/MCRegisterInfo.h
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@ -386,14 +386,24 @@ public:
return RegEncodingTable[RegNo];
}
/// Returns true if regB is a sub-register of regA.
bool isSubRegister(unsigned regA, unsigned regB) const {
return isSuperRegister(regB, regA);
/// Returns true if RegB is a sub-register of RegA.
bool isSubRegister(unsigned RegA, unsigned RegB) const {
return isSuperRegister(RegB, RegA);
}
/// Returns true if regB is a super-register of regA.
/// Returns true if RegB is a super-register of RegA.
bool isSuperRegister(unsigned RegA, unsigned RegB) const;
/// Returns true if RegB is a sub-register of RegA or if RegB == RegA.
bool isSubRegisterEq(unsigned RegA, unsigned RegB) const {
return isSuperRegisterEq(RegB, RegA);
}
/// Returns true if RegB is a super-register of RegA or if RegB == RegA.
bool isSuperRegisterEq(unsigned RegA, unsigned RegB) const {
return RegA == RegB || isSuperRegister(RegA, RegB);
}
};
//===----------------------------------------------------------------------===//