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| author | Preston Gurd <preston.gurd@intel.com> | 2013-03-04 18:13:57 +0000 |
|---|---|---|
| committer | Preston Gurd <preston.gurd@intel.com> | 2013-03-04 18:13:57 +0000 |
| commit | 485296d1e85510de2b5df8a5c652fd0abeb5db06 (patch) | |
| tree | 37157fc9c401587e8556ae890caf95a6b1ec83fa /llvm/lib/Transforms/Scalar/CodeGenPrepare.cpp | |
| parent | 6972f6d3c7c2960df6a0720515cfa7c6846903ed (diff) | |
| download | bcm5719-llvm-485296d1e85510de2b5df8a5c652fd0abeb5db06.tar.gz bcm5719-llvm-485296d1e85510de2b5df8a5c652fd0abeb5db06.zip | |
Bypass Slow Divides
* Only apply divide bypass optimization when not optimizing for size.
* Fixed bug caused by constant for 0 value of type Int32,
used dividend type to generate the constant instead.
* For atom x86-64 apply the divide bypass to use 16-bit divides instead of
64-bit divides when operand values are small enough.
* Added lit tests for 64-bit divide bypass.
Patch by Tyler Nowicki!
llvm-svn: 176442
Diffstat (limited to 'llvm/lib/Transforms/Scalar/CodeGenPrepare.cpp')
| -rw-r--r-- | llvm/lib/Transforms/Scalar/CodeGenPrepare.cpp | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/llvm/lib/Transforms/Scalar/CodeGenPrepare.cpp b/llvm/lib/Transforms/Scalar/CodeGenPrepare.cpp index d71dd5dec63..015fd2e6e6f 100644 --- a/llvm/lib/Transforms/Scalar/CodeGenPrepare.cpp +++ b/llvm/lib/Transforms/Scalar/CodeGenPrepare.cpp @@ -154,7 +154,7 @@ bool CodeGenPrepare::runOnFunction(Function &F) { /// This optimization identifies DIV instructions that can be /// profitably bypassed and carried out with a shorter, faster divide. - if (TLI && TLI->isSlowDivBypassed()) { + if (!OptSize && TLI && TLI->isSlowDivBypassed()) { const DenseMap<unsigned int, unsigned int> &BypassWidths = TLI->getBypassSlowDivWidths(); for (Function::iterator I = F.begin(); I != F.end(); I++) |
