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Check alignment of loads when deciding whether it is safe to execute them

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unconditionally.  Besides checking the offset, also check that the underlying
object is aligned as much as the load itself.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94875 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bob Wilson
2010-01-30 04:42:39 +00:00
parent a6bff982c1
commit 49db68fba0
6 changed files with 70 additions and 16 deletions
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2
include/llvm/Transforms/Utils/Local.h
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@@ -39,7 +39,7 @@ template<typename T> class SmallVectorImpl;
/// specified pointer, we do a quick local scan of the basic block containing
/// ScanFrom, to determine if the address is already accessed.
bool isSafeToLoadUnconditionally(Value *V, Instruction *ScanFrom,
const TargetData *TD = 0);
unsigned Align, const TargetData *TD = 0);
//===----------------------------------------------------------------------===//
// Local constant propagation.