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Add a simple method for marking blocks with interference in and out.

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This method matches addLinks - All the listed blocks are considered to
have interference, so they add a negative bias to their bundles.

This could also be done by addConstraints, but that requires building a
separate BlockConstraint array.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135844 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2011-07-23 03:10:19 +00:00
parent c7931fd725
commit e60f103d2d
2 changed files with 18 additions and 0 deletions
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14
lib/CodeGen/SpillPlacement.cpp
View File

@ -239,6 +239,20 @@ void SpillPlacement::addConstraints(ArrayRef<BlockConstraint> LiveBlocks) {
}
}
/// addPrefSpill - Same as addConstraints(PrefSpill)
void SpillPlacement::addPrefSpill(ArrayRef<unsigned> Blocks) {
for (ArrayRef<unsigned>::iterator I = Blocks.begin(), E = Blocks.end();
I != E; ++I) {
float Freq = getBlockFrequency(*I);
unsigned ib = bundles->getBundle(*I, 0);
unsigned ob = bundles->getBundle(*I, 1);
activate(ib);
activate(ob);
nodes[ib].addBias(-Freq, 1);
nodes[ob].addBias(-Freq, 0);
}
}
void SpillPlacement::addLinks(ArrayRef<unsigned> Links) {
for (ArrayRef<unsigned>::iterator I = Links.begin(), E = Links.end(); I != E;
++I) {

4
lib/CodeGen/SpillPlacement.h
View File

@ -96,6 +96,10 @@ public:
/// live out.
void addConstraints(ArrayRef<BlockConstraint> LiveBlocks);
/// addPrefSpill - Add PrefSpill constraints to all blocks listed.
/// @param Blocks Array of block numbers that prefer to spill in and out.
void addPrefSpill(ArrayRef<unsigned> Blocks);
/// addLinks - Add transparent blocks with the given numbers.
void addLinks(ArrayRef<unsigned> Links);