From 1217112d1167a4c11bcb2ef4471fc66fc4e43cc4 Mon Sep 17 00:00:00 2001 From: Manman Ren Date: Mon, 18 Mar 2013 21:23:25 +0000 Subject: Check whether a pointer is non-null (isKnownNonNull) in isKnownNonZero. This handles the case where we have an inbounds GEP with alloca as the pointer. This fixes the regression in PR12750 and rdar://13286434. Note that we can also fix this by handling some GEP cases in isKnownNonNull. llvm-svn: 177321 --- llvm/lib/Analysis/ValueTracking.cpp | 2 ++ 1 file changed, 2 insertions(+) (limited to 'llvm/lib/Analysis/ValueTracking.cpp') diff --git a/llvm/lib/Analysis/ValueTracking.cpp b/llvm/lib/Analysis/ValueTracking.cpp index 45b75df5087..45dcc5e37ec 100644 --- a/llvm/lib/Analysis/ValueTracking.cpp +++ b/llvm/lib/Analysis/ValueTracking.cpp @@ -953,6 +953,8 @@ bool llvm::isKnownNonZero(Value *V, const DataLayout *TD, unsigned Depth) { // Check for pointer simplifications. if (V->getType()->isPointerTy()) { + if (isKnownNonNull(V)) + return true; if (GEPOperator *GEP = dyn_cast(V)) if (isGEPKnownNonNull(GEP, TD, Depth)) return true; -- cgit v1.2.3