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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 | 6bfba2e5af163442a1c6b11fe14aa9df9101cfd7 (patch) | |
| tree | bfad3009de9ca920990bcde1d0b9a90e96e549be /lib/CodeGen/SelectionDAG/FastISel.cpp | |
| parent | e341e8ce1ada854e7f8fcfcf18bb2e17be2ac0ee (diff) | |
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).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129864 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/SelectionDAG/FastISel.cpp')
0 files changed, 0 insertions, 0 deletions