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Teach MemoryBuiltins and InstructionSimplify that operator new never returns NULL.

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This is safe per C++11 18.6.1.1p3: [operator new returns] a non-null pointer to
suitably aligned storage (3.7.4), or else throw a bad_alloc exception. This
requirement is binding on a replacement version of this function.

Brings us a tiny bit closer to eliminating more vector push_backs.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191310 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2013-09-24 16:37:51 +00:00
parent d721520e4c
commit 6629210aaf
6 changed files with 46 additions and 7 deletions
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lib/Analysis/InstructionSimplify.cpp
+1 -1
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@@ -1739,7 +1739,7 @@ static Constant *computePointerICmp(const DataLayout *TD,
RHS = RHS->stripPointerCasts();
// A non-null pointer is not equal to a null pointer.
if (llvm::isKnownNonNull(LHS) && isa<ConstantPointerNull>(RHS) &&
if (llvm::isKnownNonNull(LHS, TLI) && isa<ConstantPointerNull>(RHS) &&
(Pred == CmpInst::ICMP_EQ || Pred == CmpInst::ICMP_NE))
return ConstantInt::get(GetCompareTy(LHS),
!CmpInst::isTrueWhenEqual(Pred));