[llvm] r374243 - [InstCombine] Fix PR43617

[Evandro Menezes via llvm-commits]

Author: evandro
Date: Wed Oct  9 15:03:23 2019
New Revision: 374243

URL: http://llvm.org/viewvc/llvm-project?rev=374243&view=rev
Log:
[InstCombine] Fix PR43617

Check for `nullptr` before inspecting composite function.

Modified:
    llvm/trunk/lib/Transforms/Utils/SimplifyLibCalls.cpp

Modified: llvm/trunk/lib/Transforms/Utils/SimplifyLibCalls.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Utils/SimplifyLibCalls.cpp?rev=374243&r1=374242&r2=374243&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/Utils/SimplifyLibCalls.cpp (original)
+++ llvm/trunk/lib/Transforms/Utils/SimplifyLibCalls.cpp Wed Oct  9 15:03:23 2019
@@ -1916,10 +1916,10 @@ Value *LibCallSimplifier::optimizeLog(Ca
   B.setFastMathFlags(FastMathFlags::getFast());
 
   Function *ArgFn = Arg->getCalledFunction();
-  StringRef ArgNm = ArgFn->getName();
-  Intrinsic::ID ArgID = ArgFn->getIntrinsicID();
+  Intrinsic::ID ArgID =
+      ArgFn ? ArgFn->getIntrinsicID() : Intrinsic::not_intrinsic;
   LibFunc ArgLb = NotLibFunc;
-  TLI->getLibFunc(ArgNm, ArgLb);
+  TLI->getLibFunc(Arg, ArgLb);
 
   // log(pow(x,y)) -> y*log(x)
   if (ArgLb == PowLb || ArgID == Intrinsic::pow) {
@@ -1934,9 +1934,10 @@ Value *LibCallSimplifier::optimizeLog(Ca
     substituteInParent(Arg, MulY);
     return MulY;
   }
+
   // log(exp{,2,10}(y)) -> y*log({e,2,10})
   // TODO: There is no exp10() intrinsic yet.
-  else if (ArgLb == ExpLb || ArgLb == Exp2Lb || ArgLb == Exp10Lb ||
+  if (ArgLb == ExpLb || ArgLb == Exp2Lb || ArgLb == Exp10Lb ||
            ArgID == Intrinsic::exp || ArgID == Intrinsic::exp2) {
     Constant *Eul;
     if (ArgLb == ExpLb || ArgID == Intrinsic::exp)