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| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2011-04-20 18:19:48 +0000 |
|---|---|---|
| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2011-04-20 18:19:48 +0000 |
| commit | 0e34c1dfac5f55d58cf16197b3e87f49089a5339 (patch) | |
| tree | d962d8b816d631b41da1bb3f6124d029ebda2d02 /llvm/utils/TableGen/CodeGenTarget.cpp | |
| parent | d828f316afaaf6825ea968eac5a46d34d375810d (diff) | |
| download | bcm5719-llvm-0e34c1dfac5f55d58cf16197b3e87f49089a5339.tar.gz bcm5719-llvm-0e34c1dfac5f55d58cf16197b3e87f49089a5339.zip | |
Prefer cheap registers for busy live ranges.
On the x86-64 and thumb2 targets, some registers are more expensive to encode
than others in the same register class.
Add a CostPerUse field to the TableGen register description, and make it
available from TRI->getCostPerUse. This represents the cost of a REX prefix or a
32-bit instruction encoding required by choosing a high register.
Teach the greedy register allocator to prefer cheap registers for busy live
ranges (as indicated by spill weight).
llvm-svn: 129864
Diffstat (limited to 'llvm/utils/TableGen/CodeGenTarget.cpp')
| -rw-r--r-- | llvm/utils/TableGen/CodeGenTarget.cpp | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/llvm/utils/TableGen/CodeGenTarget.cpp b/llvm/utils/TableGen/CodeGenTarget.cpp index cc09c8d6833..c9ccb960d9f 100644 --- a/llvm/utils/TableGen/CodeGenTarget.cpp +++ b/llvm/utils/TableGen/CodeGenTarget.cpp @@ -172,6 +172,7 @@ void CodeGenTarget::ReadRegisters() const { CodeGenRegister::CodeGenRegister(Record *R) : TheDef(R) { DeclaredSpillSize = R->getValueAsInt("SpillSize"); DeclaredSpillAlignment = R->getValueAsInt("SpillAlignment"); + CostPerUse = R->getValueAsInt("CostPerUse"); } const std::string &CodeGenRegister::getName() const { |
