commit 0aae4bd0fc9133ba3b4e59d6cdb05b878fc8f436
author Benjamin Kramer <benny.kra@googlemail.com> Fri Oct 19 20:43:44 2012 +0000
committer Benjamin Kramer <benny.kra@googlemail.com> Fri Oct 19 20:43:44 2012 +0000
tree ad9ce31279574e965cf4603e2fa6385505f6f892
parent 28ce1cc183582e4061f1e5ba4fb443d99a4915ae

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

diff --git a/lib/Transforms/Scalar/SimplifyLibCalls.cpp b/lib/Transforms/Scalar/SimplifyLibCalls.cpp
index 90efa8a..c82a00f 100644
--- a/lib/Transforms/Scalar/SimplifyLibCalls.cpp
+++ b/lib/Transforms/Scalar/SimplifyLibCalls.cpp
@@ -772,8 +772,8 @@
 
     // 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);
     }