Revert "[SimplifyLibCalls] sprintf doesn't copy null bytes"
The destination buffer that sprintf uses is restrict qualified, we do
not need to worry about derived pointers referenced via format
specifiers.
This reverts commit r267580.
llvm-svn: 267605
diff --git a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
index 70f6422..104a82c 100644
--- a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
+++ b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
@@ -1995,10 +1995,9 @@
Value *Len = emitStrLen(CI->getArgOperand(2), B, DL, TLI);
if (!Len)
return nullptr;
- B.CreateMemCpy(CI->getArgOperand(0), CI->getArgOperand(2), Len, 1);
- Value *PtrToNullByte =
- B.CreateGEP(B.getInt8Ty(), CI->getArgOperand(0), Len, "nul");
- B.CreateStore(B.getInt8(0), PtrToNullByte);
+ Value *IncLen =
+ B.CreateAdd(Len, ConstantInt::get(Len->getType(), 1), "leninc");
+ B.CreateMemCpy(CI->getArgOperand(0), CI->getArgOperand(2), IncLen, 1);
// The sprintf result is the unincremented number of bytes in the string.
return B.CreateIntCast(Len, CI->getType(), false);