Jakob Stoklund Olesen 757f0e37ea Introduce TargetRegisterInfo::getOverlaps(Reg), returning a list of all ... registers that alias Reg, including itself. This is almost the same as the existing getAliasSet() method, except for the inclusion of Reg. The name matches the reflexive TRI::regsOverlap(x, y) relation. It is very common to do stuff to a register and all its aliases: stuff(Reg) for (const unsigned *Alias = TRI->getAliasSet(Reg); *Alias; ++Alias) stuff(*Alias); That can now be written as the simpler: for (const unsigned *Alias = TRI->getOverlaps(Reg); *Alias; ++Alias) stuff(*Alias); This change requires a bit more constant space for the alias lists because Reg is included and because the empty alias list cannot be shared any longer. If the getAliasSet method is eventually removed, this space can be reclaimed by sharing overlap lists. For instance, %rax and %eax have identical overlap sets. llvm-svn: 121800		2010-12-14 23:03:42 +00:00
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llvm	Introduce TargetRegisterInfo::getOverlaps(Reg), returning a list of all	2010-12-14 23:03:42 +00:00
llvm-c	I swear I did a make clean and make before committing all this...	2010-11-29 18:47:54 +00:00