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Order register classes by spill size first, members last.

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This is still a topological ordering such that every register class gets
a smaller enum value than its sub-classes.

Placing the smaller spill sizes first makes a difference for the
super-register class bit masks. When looking for a super-register class,
we usually want the smallest possible kind of super-register. That is
now available as the first bit set in the bit mask.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156222 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2012-05-04 23:12:22 +00:00
parent 7fc4d9cbc5
commit a93090ccd9
1 changed files with 7 additions and 7 deletions
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14
utils/TableGen/CodeGenRegisters.cpp
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@ -611,13 +611,6 @@ static int TopoOrderRC(const void *PA, const void *PB) {
if (A == B)
return 0;
// Order by descending set size. Note that the classes' allocation order may
// not have been computed yet. The Members set is always vaild.
if (A->getMembers().size() > B->getMembers().size())
return -1;
if (A->getMembers().size() < B->getMembers().size())
return 1;
// Order by ascending spill size.
if (A->SpillSize < B->SpillSize)
return -1;
@ -630,6 +623,13 @@ static int TopoOrderRC(const void *PA, const void *PB) {
if (A->SpillAlignment > B->SpillAlignment)
return 1;
// Order by descending set size. Note that the classes' allocation order may
// not have been computed yet. The Members set is always vaild.
if (A->getMembers().size() > B->getMembers().size())
return -1;
if (A->getMembers().size() < B->getMembers().size())
return 1;
// Finally order by name as a tie breaker.
return StringRef(A->getName()).compare(B->getName());
}