From 0aae4bd0fc9133ba3b4e59d6cdb05b878fc8f436 Mon Sep 17 00:00:00 2001
From: Benjamin Kramer <benny.kra@googlemail.com>
Date: Fri, 19 Oct 2012 20:43:44 +0000
Subject: SimplifyLibcalls: The return value of ffsll is always i32, even when
 the input is zero.

Fixes PR13028.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166313 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/Scalar/SimplifyLibCalls.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'lib/Transforms/Scalar/SimplifyLibCalls.cpp')

diff --git a/lib/Transforms/Scalar/SimplifyLibCalls.cpp b/lib/Transforms/Scalar/SimplifyLibCalls.cpp
index 90efa8ae0e..c82a00fc2c 100644
--- a/lib/Transforms/Scalar/SimplifyLibCalls.cpp
+++ b/lib/Transforms/Scalar/SimplifyLibCalls.cpp
@@ -772,8 +772,8 @@ struct FFSOpt : public LibCallOptimization {
 
     // Constant fold.
     if (ConstantInt *CI = dyn_cast<ConstantInt>(Op)) {
-      if (CI->getValue() == 0)  // ffs(0) -> 0.
-        return Constant::getNullValue(CI->getType());
+      if (CI->isZero()) // ffs(0) -> 0.
+        return B.getInt32(0);
       // ffs(c) -> cttz(c)+1
       return B.getInt32(CI->getValue().countTrailingZeros() + 1);
     }
-- 
cgit v1.2.3