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Move FindAvailableLoadedValue isSafeToLoadUnconditionally out of

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lib/Transforms/Utils and into lib/Analysis so that Analysis passes
can use them.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104949 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2010-05-28 16:19:17 +00:00
parent 700012231d
commit dd9344f3fa
11 changed files with 291 additions and 252 deletions
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18
include/llvm/Transforms/Utils/BasicBlockUtils.h
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@ -66,24 +66,6 @@ void ReplaceInstWithInst(BasicBlock::InstListType &BIL,
//
void ReplaceInstWithInst(Instruction *From, Instruction *To);
/// FindAvailableLoadedValue - Scan the ScanBB block backwards (starting at the
/// instruction before ScanFrom) checking to see if we have the value at the
/// memory address *Ptr locally available within a small number of instructions.
/// If the value is available, return it.
///
/// If not, return the iterator for the last validated instruction that the
/// value would be live through. If we scanned the entire block and didn't find
/// something that invalidates *Ptr or provides it, ScanFrom would be left at
/// begin() and this returns null. ScanFrom could also be left
///
/// MaxInstsToScan specifies the maximum instructions to scan in the block. If
/// it is set to 0, it will scan the whole block. You can also optionally
/// specify an alias analysis implementation, which makes this more precise.
Value *FindAvailableLoadedValue(Value *Ptr, BasicBlock *ScanBB,
BasicBlock::iterator &ScanFrom,
unsigned MaxInstsToScan = 6,
AliasAnalysis *AA = 0);
/// FindFunctionBackedges - Analyze the specified function to find all of the
/// loop backedges in the function and return them. This is a relatively cheap
/// (compared to computing dominators and loop info) analysis.