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| author | Chris Lattner <sabre@nondot.org> | 2010-01-11 22:45:25 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2010-01-11 22:45:25 +0000 |
| commit | a6b1356cf98bddc2484d5f0ca8d6bc83af3ab12e (patch) | |
| tree | bfcb7f064ae288b1bb5d7589010ce7b0576352fe /llvm/lib/CodeGen/LiveStackAnalysis.cpp | |
| parent | 88f3eb898a0ace0ff161c52508bd33ffdfc75bf5 (diff) | |
| download | bcm5719-llvm-a6b1356cf98bddc2484d5f0ca8d6bc83af3ab12e.tar.gz bcm5719-llvm-a6b1356cf98bddc2484d5f0ca8d6bc83af3ab12e.zip | |
Disable folding sext(trunc(x)) -> x (and other similar cast/cast cases) when the
trunc has multiple uses. Codegen is not able to coalesce the subreg case
correctly and so this leads to higher register pressure and spilling (see PR5997).
This speeds up 256.bzip2 from 8.60 -> 8.04s on my machine, ~7%.
llvm-svn: 93200
Diffstat (limited to 'llvm/lib/CodeGen/LiveStackAnalysis.cpp')
0 files changed, 0 insertions, 0 deletions
