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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 | 5cdc3a949af0cef7f2163f8a7acbf3049c226321 (patch) | |
| tree | 6cbd9b033b162075d09d6815be1c15f65f1bd468 /lib/CodeGen/MachO.h | |
| parent | 6935efcb667bcd4dd3a00bbd420461e1fadba73a (diff) | |
| download | external_llvm-5cdc3a949af0cef7f2163f8a7acbf3049c226321.zip external_llvm-5cdc3a949af0cef7f2163f8a7acbf3049c226321.tar.gz external_llvm-5cdc3a949af0cef7f2163f8a7acbf3049c226321.tar.bz2 | |
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).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89720 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/MachO.h')
0 files changed, 0 insertions, 0 deletions