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| author | Anton Korobeynikov <asl@math.spbu.ru> | 2009-11-24 00:44:37 +0000 |
|---|---|---|
| committer | Anton Korobeynikov <asl@math.spbu.ru> | 2009-11-24 00:44:37 +0000 |
| commit | 25229086533627dbbfe5f602737d78441835a47e (patch) | |
| tree | 3356344aefc9f1b619648aec92fd5d99b1c688f4 /clang/lib/CodeGen/CodeGenModule.cpp | |
| parent | f890f5166670d56f0fe821178b8ff15a5fecb0b6 (diff) | |
| download | bcm5719-llvm-25229086533627dbbfe5f602737d78441835a47e.tar.gz bcm5719-llvm-25229086533627dbbfe5f602737d78441835a47e.zip | |
Materialize global addresses via movt/movw pair, this is always better
than doing the same via constpool:
1. Load from constpool costs 3 cycles on A9, movt/movw pair - just 2.
2. Load from constpool might stall up to 300 cycles due to cache miss.
3. Movt/movw does not use load/store unit.
4. Less constpool entries => better compiler performance.
This is only enabled on ELF systems, since darwin does not have needed
relocations (yet).
llvm-svn: 89720
Diffstat (limited to 'clang/lib/CodeGen/CodeGenModule.cpp')
0 files changed, 0 insertions, 0 deletions
