[TargetLibraryInfo] Add support for fls, flsl, flsll.

This is a prerequisite for further optimisations of these functions,
which will be commited as a separate patch.

Differential Revision:	http://reviews.llvm.org/D14219

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@252535 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/Analysis/TargetLibraryInfo.def b/include/llvm/Analysis/TargetLibraryInfo.def
index 1c1fdfef980d07b868adac6f29ba59cfe79a7e88..393e9d6695f866f86f70a7126c3a41dbfd1ffe51 100644 (file)
--- a/include/llvm/Analysis/TargetLibraryInfo.def
+++ b/include/llvm/Analysis/TargetLibraryInfo.def
@@ -406,6 +406,15 @@ TLI_DEFINE_STRING_INTERNAL("floorf")
 /// long double floorl(long double x);
 TLI_DEFINE_ENUM_INTERNAL(floorl)
 TLI_DEFINE_STRING_INTERNAL("floorl")
+/// int fls(int i);
+TLI_DEFINE_ENUM_INTERNAL(fls)
+TLI_DEFINE_STRING_INTERNAL("fls")
+/// int flsl(long int i);
+TLI_DEFINE_ENUM_INTERNAL(flsl)
+TLI_DEFINE_STRING_INTERNAL("flsl")
+/// int flsll(long long int i);
+TLI_DEFINE_ENUM_INTERNAL(flsll)
+TLI_DEFINE_STRING_INTERNAL("flsll")
 /// double fmax(double x, double y);
 TLI_DEFINE_ENUM_INTERNAL(fmax)
 TLI_DEFINE_STRING_INTERNAL("fmax")

diff --git a/lib/Analysis/TargetLibraryInfo.cpp b/lib/Analysis/TargetLibraryInfo.cpp
index 2588aac8414780d942b167061e3348f8f45ddc28..845ca05a74fc254949122bd8cdfbfecff7e15cbf 100644 (file)
--- a/lib/Analysis/TargetLibraryInfo.cpp
+++ b/lib/Analysis/TargetLibraryInfo.cpp
@@ -350,6 +350,16 @@ static void initialize(TargetLibraryInfoImpl &TLI, const Triple &T,
     TLI.setUnavailable(LibFunc::ffsll);
   }
 
+  // The following functions are available on at least FreeBSD:
+  // http://svn.freebsd.org/base/head/lib/libc/string/fls.c
+  // http://svn.freebsd.org/base/head/lib/libc/string/flsl.c
+  // http://svn.freebsd.org/base/head/lib/libc/string/flsll.c
+  if (!T.isOSFreeBSD()) {
+    TLI.setUnavailable(LibFunc::fls);
+    TLI.setUnavailable(LibFunc::flsl);
+    TLI.setUnavailable(LibFunc::flsll);
+  }
+
   // The following functions are available on at least Linux:
   if (!T.isOSLinux()) {
     TLI.setUnavailable(LibFunc::dunder_strdup);