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Move llvm::computeLoopSafetyInfo from LICM.cpp to LoopUtils.cpp. NFC

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Move computeLoopSafetyInfo, defined in Transforms/Utils/LoopUtils.h,
into the corresponding LoopUtils.cpp, as opposed to LICM where it resides
at the moment. This will allow other functions from Transforms/Utils
to reference it.

llvm-svn: 325151
This commit is contained in:
David Green 2018-02-14 18:34:53 +00:00
parent 0d2a33eaff
commit ad8913af27
2 changed files with 37 additions and 37 deletions
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37
lib/Transforms/Scalar/LICM.cpp
View File

@ -503,43 +503,6 @@ bool llvm::hoistRegion(DomTreeNode *N, AliasAnalysis *AA, LoopInfo *LI,
return Changed;
}
/// Computes loop safety information, checks loop body & header
/// for the possibility of may throw exception.
///
void llvm::computeLoopSafetyInfo(LoopSafetyInfo *SafetyInfo, Loop *CurLoop) {
assert(CurLoop != nullptr && "CurLoop cant be null");
BasicBlock *Header = CurLoop->getHeader();
// Setting default safety values.
SafetyInfo->MayThrow = false;
SafetyInfo->HeaderMayThrow = false;
// Iterate over header and compute safety info.
for (BasicBlock::iterator I = Header->begin(), E = Header->end();
(I != E) && !SafetyInfo->HeaderMayThrow; ++I)
SafetyInfo->HeaderMayThrow |=
!isGuaranteedToTransferExecutionToSuccessor(&*I);
SafetyInfo->MayThrow = SafetyInfo->HeaderMayThrow;
// Iterate over loop instructions and compute safety info.
// Skip header as it has been computed and stored in HeaderMayThrow.
// The first block in loopinfo.Blocks is guaranteed to be the header.
assert(Header == *CurLoop->getBlocks().begin() &&
"First block must be header");
for (Loop::block_iterator BB = std::next(CurLoop->block_begin()),
BBE = CurLoop->block_end();
(BB != BBE) && !SafetyInfo->MayThrow; ++BB)
for (BasicBlock::iterator I = (*BB)->begin(), E = (*BB)->end();
(I != E) && !SafetyInfo->MayThrow; ++I)
SafetyInfo->MayThrow |= !isGuaranteedToTransferExecutionToSuccessor(&*I);
// Compute funclet colors if we might sink/hoist in a function with a funclet
// personality routine.
Function *Fn = CurLoop->getHeader()->getParent();
if (Fn->hasPersonalityFn())
if (Constant *PersonalityFn = Fn->getPersonalityFn())
if (isFuncletEHPersonality(classifyEHPersonality(PersonalityFn)))
SafetyInfo->BlockColors = colorEHFunclets(*Fn);
}
// Return true if LI is invariant within scope of the loop. LI is invariant if
// CurLoop is dominated by an invariant.start representing the same memory
// location and size as the memory location LI loads from, and also the

37
lib/Transforms/Utils/LoopUtils.cpp
View File

@ -1481,6 +1481,43 @@ void llvm::deleteDeadLoop(Loop *L, DominatorTree *DT = nullptr,
}
}
/// Computes loop safety information, checks loop body & header
/// for the possibility of may throw exception.
///
void llvm::computeLoopSafetyInfo(LoopSafetyInfo *SafetyInfo, Loop *CurLoop) {
assert(CurLoop != nullptr && "CurLoop cant be null");
BasicBlock *Header = CurLoop->getHeader();
// Setting default safety values.
SafetyInfo->MayThrow = false;
SafetyInfo->HeaderMayThrow = false;
// Iterate over header and compute safety info.
for (BasicBlock::iterator I = Header->begin(), E = Header->end();
(I != E) && !SafetyInfo->HeaderMayThrow; ++I)
SafetyInfo->HeaderMayThrow |=
!isGuaranteedToTransferExecutionToSuccessor(&*I);
SafetyInfo->MayThrow = SafetyInfo->HeaderMayThrow;
// Iterate over loop instructions and compute safety info.
// Skip header as it has been computed and stored in HeaderMayThrow.
// The first block in loopinfo.Blocks is guaranteed to be the header.
assert(Header == *CurLoop->getBlocks().begin() &&
"First block must be header");
for (Loop::block_iterator BB = std::next(CurLoop->block_begin()),
BBE = CurLoop->block_end();
(BB != BBE) && !SafetyInfo->MayThrow; ++BB)
for (BasicBlock::iterator I = (*BB)->begin(), E = (*BB)->end();
(I != E) && !SafetyInfo->MayThrow; ++I)
SafetyInfo->MayThrow |= !isGuaranteedToTransferExecutionToSuccessor(&*I);
// Compute funclet colors if we might sink/hoist in a function with a funclet
// personality routine.
Function *Fn = CurLoop->getHeader()->getParent();
if (Fn->hasPersonalityFn())
if (Constant *PersonalityFn = Fn->getPersonalityFn())
if (isFuncletEHPersonality(classifyEHPersonality(PersonalityFn)))
SafetyInfo->BlockColors = colorEHFunclets(*Fn);
}
/// Returns true if the instruction in a loop is guaranteed to execute at least
/// once.
bool llvm::isGuaranteedToExecute(const Instruction &Inst,