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Add some comments, and tidy up some whitespace. 

llvm-svn: 70510
This commit is contained in:
Dan Gohman 2009-04-30 20:48:53 +00:00
parent 2b8da35f9d
commit fa066ef136
2 changed files with 9 additions and 6 deletions
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3
llvm/include/llvm/Analysis/ScalarEvolution.h
View File

@ -449,7 +449,8 @@ namespace llvm {
SCEVHandle getSCEVAtScope(Value *V, const Loop *L);
/// isLoopGuardedByCond - Test whether entry to the loop is protected by
/// a conditional between LHS and RHS.
/// a conditional between LHS and RHS. This is used to help avoid max
/// expressions in loop trip counts.
bool isLoopGuardedByCond(const Loop *L, ICmpInst::Predicate Pred,
SCEV *LHS, SCEV *RHS);

12
llvm/lib/Analysis/ScalarEvolution.cpp
View File

@ -2986,8 +2986,9 @@ SCEVHandle ScalarEvolution::HowFarToNonZero(SCEV *V, const Loop *L) {
///
BasicBlock *
ScalarEvolution::getPredecessorWithUniqueSuccessorForBB(BasicBlock *BB) {
// If the block has a unique predecessor, the predecessor must have
// no other successors from which BB is reachable.
// If the block has a unique predecessor, then there is no path from the
// predecessor to the block that does not go through the direct edge
// from the predecessor to the block.
if (BasicBlock *Pred = BB->getSinglePredecessor())
return Pred;
@ -3002,10 +3003,11 @@ ScalarEvolution::getPredecessorWithUniqueSuccessorForBB(BasicBlock *BB) {
}
/// isLoopGuardedByCond - Test whether entry to the loop is protected by
/// a conditional between LHS and RHS.
/// a conditional between LHS and RHS. This is used to help avoid max
/// expressions in loop trip counts.
bool ScalarEvolution::isLoopGuardedByCond(const Loop *L,
ICmpInst::Predicate Pred,
SCEV *LHS, SCEV *RHS) {
ICmpInst::Predicate Pred,
SCEV *LHS, SCEV *RHS) {
BasicBlock *Preheader = L->getLoopPreheader();
BasicBlock *PreheaderDest = L->getHeader();