//
//===----------------------------------------------------------------------===//
-#include "llvm/Analysis/IVUsers.h"
#include "llvm/ADT/STLExtras.h"
+#include "llvm/Analysis/AssumptionCache.h"
+#include "llvm/Analysis/CodeMetrics.h"
+#include "llvm/Analysis/IVUsers.h"
#include "llvm/Analysis/LoopPass.h"
#include "llvm/Analysis/ScalarEvolutionExpressions.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Dominators.h"
#include "llvm/IR/Instructions.h"
+#include "llvm/IR/Module.h"
#include "llvm/IR/Type.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
char IVUsers::ID = 0;
INITIALIZE_PASS_BEGIN(IVUsers, "iv-users",
"Induction Variable Users", false, true)
-INITIALIZE_PASS_DEPENDENCY(LoopInfo)
+INITIALIZE_PASS_DEPENDENCY(AssumptionCacheTracker)
+INITIALIZE_PASS_DEPENDENCY(LoopInfoWrapperPass)
INITIALIZE_PASS_DEPENDENCY(DominatorTreeWrapperPass)
-INITIALIZE_PASS_DEPENDENCY(ScalarEvolution)
+INITIALIZE_PASS_DEPENDENCY(ScalarEvolutionWrapperPass)
INITIALIZE_PASS_END(IVUsers, "iv-users",
"Induction Variable Users", false, true)
/// return true. Otherwise, return false.
bool IVUsers::AddUsersImpl(Instruction *I,
SmallPtrSetImpl<Loop*> &SimpleLoopNests) {
+ const DataLayout &DL = I->getModule()->getDataLayout();
+
// Add this IV user to the Processed set before returning false to ensure that
// all IV users are members of the set. See IVUsers::isIVUserOrOperand.
- if (!Processed.insert(I))
+ if (!Processed.insert(I).second)
return true; // Instruction already handled.
if (!SE->isSCEVable(I->getType()))
// IVUsers is used by LSR which assumes that all SCEV expressions are safe to
// pass to SCEVExpander. Expressions are not safe to expand if they represent
// operations that are not safe to speculate, namely integer division.
- if (!isa<PHINode>(I) && !isSafeToSpeculativelyExecute(I, DL))
+ if (!isa<PHINode>(I) && !isSafeToSpeculativelyExecute(I))
return false;
// LSR is not APInt clean, do not touch integers bigger than 64-bits.
// Also avoid creating IVs of non-native types. For example, we don't want a
// 64-bit IV in 32-bit code just because the loop has one 64-bit cast.
uint64_t Width = SE->getTypeSizeInBits(I->getType());
- if (Width > 64 || (DL && !DL->isLegalInteger(Width)))
+ if (Width > 64 || !DL.isLegalInteger(Width))
+ return false;
+
+ // Don't attempt to promote ephemeral values to indvars. They will be removed
+ // later anyway.
+ if (EphValues.count(I))
return false;
// Get the symbolic expression for this instruction.
SmallPtrSet<Instruction *, 4> UniqueUsers;
for (Use &U : I->uses()) {
Instruction *User = cast<Instruction>(U.getUser());
- if (!UniqueUsers.insert(User))
+ if (!UniqueUsers.insert(User).second)
continue;
// Do not infinitely recurse on PHI nodes.
}
void IVUsers::getAnalysisUsage(AnalysisUsage &AU) const {
- AU.addRequired<LoopInfo>();
+ AU.addRequired<AssumptionCacheTracker>();
+ AU.addRequired<LoopInfoWrapperPass>();
AU.addRequired<DominatorTreeWrapperPass>();
- AU.addRequired<ScalarEvolution>();
+ AU.addRequired<ScalarEvolutionWrapperPass>();
AU.setPreservesAll();
}
bool IVUsers::runOnLoop(Loop *l, LPPassManager &LPM) {
L = l;
- LI = &getAnalysis<LoopInfo>();
+ AC = &getAnalysis<AssumptionCacheTracker>().getAssumptionCache(
+ *L->getHeader()->getParent());
+ LI = &getAnalysis<LoopInfoWrapperPass>().getLoopInfo();
DT = &getAnalysis<DominatorTreeWrapperPass>().getDomTree();
- SE = &getAnalysis<ScalarEvolution>();
- DataLayoutPass *DLP = getAnalysisIfAvailable<DataLayoutPass>();
- DL = DLP ? &DLP->getDataLayout() : nullptr;
+ SE = &getAnalysis<ScalarEvolutionWrapperPass>().getSE();
+
+ // Collect ephemeral values so that AddUsersIfInteresting skips them.
+ EphValues.clear();
+ CodeMetrics::collectEphemeralValues(L, AC, EphValues);
// Find all uses of induction variables in this loop, and categorize
// them by stride. Start by finding all of the PHI nodes in the header for
// this loop. If they are induction variables, inspect their uses.
for (BasicBlock::iterator I = L->getHeader()->begin(); isa<PHINode>(I); ++I)
- (void)AddUsersIfInteresting(I);
+ (void)AddUsersIfInteresting(&*I);
return false;
}