STATISTIC(NumElimExt , "Number of IV sign/zero extends eliminated");
STATISTIC(NumElimIV , "Number of congruent IVs eliminated");
-namespace llvm {
- cl::opt<bool> EnableIVRewrite(
- "enable-iv-rewrite", cl::Hidden,
- cl::desc("Enable canonical induction variable rewriting"));
-
- // Trip count verification can be enabled by default under NDEBUG if we
- // implement a strong expression equivalence checker in SCEV. Until then, we
- // use the verify-indvars flag, which may assert in some cases.
- cl::opt<bool> VerifyIndvars(
- "verify-indvars", cl::Hidden,
- cl::desc("Verify the ScalarEvolution result after running indvars"));
-}
+static cl::opt<bool> EnableIVRewrite(
+ "enable-iv-rewrite", cl::Hidden,
+ cl::desc("Enable canonical induction variable rewriting"));
+
+// Trip count verification can be enabled by default under NDEBUG if we
+// implement a strong expression equivalence checker in SCEV. Until then, we
+// use the verify-indvars flag, which may assert in some cases.
+static cl::opt<bool> VerifyIndvars(
+ "verify-indvars", cl::Hidden,
+ cl::desc("Verify the ScalarEvolution result after running indvars"));
namespace {
class IndVarSimplify : public LoopPass {
// base of a recurrence. This handles the case in which SCEV expansion
// converts a pointer type recurrence into a nonrecurrent pointer base
// indexed by an integer recurrence.
+
+ // If the GEP base pointer is a vector of pointers, abort.
+ if (!FromPtr->getType()->isPointerTy() || !ToPtr->getType()->isPointerTy())
+ return false;
+
const SCEV *FromBase = SE->getPointerBase(SE->getSCEV(FromPtr));
const SCEV *ToBase = SE->getPointerBase(SE->getSCEV(ToPtr));
if (FromBase == ToBase)
else
return 0;
+ // When creating this AddExpr, don't apply the current operations NSW or NUW
+ // flags. This instruction may be guarded by control flow that the no-wrap
+ // behavior depends on. Non-control-equivalent instructions can be mapped to
+ // the same SCEV expression, and it would be incorrect to transfer NSW/NUW
+ // semantics to those operations.
const SCEVAddRecExpr *AddRec = dyn_cast<SCEVAddRecExpr>(
- SE->getAddExpr(SE->getSCEV(DU.WideDef), ExtendOperExpr,
- IsSigned ? SCEV::FlagNSW : SCEV::FlagNUW));
+ SE->getAddExpr(SE->getSCEV(DU.WideDef), ExtendOperExpr));
if (!AddRec || AddRec->getLoop() != L)
return 0;