From b05bac940da334e10dee66f4d1d88c53014bcf5d Mon Sep 17 00:00:00 2001
From: Rong Xu <xur@google.com>
Date: Mon, 24 Oct 2016 16:50:12 +0000
Subject: [PATCH] Check the number of Args in LibCallsShrinkWrap.

Some library fucntions can have no argument.

llvm-svn: 284989
---
 llvm/lib/Transforms/Utils/LibCallsShrinkWrap.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/llvm/lib/Transforms/Utils/LibCallsShrinkWrap.cpp b/llvm/lib/Transforms/Utils/LibCallsShrinkWrap.cpp
index cf56a589c9b7..c9924984bb57 100644
--- a/llvm/lib/Transforms/Utils/LibCallsShrinkWrap.cpp
+++ b/llvm/lib/Transforms/Utils/LibCallsShrinkWrap.cpp
@@ -317,6 +317,8 @@ void LibCallsShrinkWrap::checkCandidate(CallInst &CI) {
   if (!TLI.getLibFunc(*Callee, Func) || !TLI.has(Func))
     return;
 
+  if (CI.getNumArgOperands() == 0)
+    return;
   // TODO: Handle long double in other formats.
   Type *ArgType = CI.getArgOperand(0)->getType();
   if (!(ArgType->isFloatTy() || ArgType->isDoubleTy() ||