Simplification of libcall like printf->puts must check for RtLibUseGOT metadata.
With -fno-plt, for example, calls to printf when getting converted to puts
still use the PLT. This patch checks for the metadata "RtLibUseGOT" and
annotates the declaration with the right attributes.
Differential Revision: https://reviews.llvm.org/D45180
llvm-svn: 329768
diff --git a/llvm/lib/Transforms/Utils/BuildLibCalls.cpp b/llvm/lib/Transforms/Utils/BuildLibCalls.cpp
index d4cf03c..24af7c4 100644
--- a/llvm/lib/Transforms/Utils/BuildLibCalls.cpp
+++ b/llvm/lib/Transforms/Utils/BuildLibCalls.cpp
@@ -105,12 +105,23 @@
return true;
}
+static bool setNonLazyBind(Function &F) {
+ if (F.hasFnAttribute(Attribute::NonLazyBind))
+ return false;
+ F.addFnAttr(Attribute::NonLazyBind);
+ return true;
+}
+
bool llvm::inferLibFuncAttributes(Function &F, const TargetLibraryInfo &TLI) {
LibFunc TheLibFunc;
if (!(TLI.getLibFunc(F, TheLibFunc) && TLI.has(TheLibFunc)))
return false;
bool Changed = false;
+
+ if (F.getParent() != nullptr && F.getParent()->getRtLibUseGOT())
+ Changed |= setNonLazyBind(F);
+
switch (TheLibFunc) {
case LibFunc_strlen:
case LibFunc_wcslen: