Try to reduce the compile time impact of r161232.

The previous change caused fast isel to not attempt handling any calls to
builtin functions.  That included things like "printf" and caused some
noticable regressions in compile time.  I wanted to avoid having fast isel
keep a separate list of functions that had to be kept in sync with what the
code in SelectionDAGBuilder.cpp was handling.  I've resolved that here by
moving the list into TargetLibraryInfo.  This is somewhat redundant in
SelectionDAGBuilder but it will ensure that we keep things consistent.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161263 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 3 insertions, 4 deletions

diff --git a/lib/CodeGen/SelectionDAG/FastISel.cpp b/lib/CodeGen/SelectionDAG/FastISel.cpp
index 635752ab65..683fac6744 100644
--- a/lib/CodeGen/SelectionDAG/FastISel.cpp
+++ b/lib/CodeGen/SelectionDAG/FastISel.cpp
@@ -790,15 +790,14 @@ FastISel::SelectInstruction(const Instruction *I) {
 
   MachineBasicBlock::iterator SavedInsertPt = FuncInfo.InsertPt;
 
-  // As a special case, don't even try to handle calls to builtin library
-  // functions so that calls to builtin functions get translated to
-  // instructions when supported by the target.
+  // As a special case, don't handle calls to builtin library functions that
+  // may be translated directly to target instructions.
   if (const CallInst *Call = dyn_cast<CallInst>(I)) {
     const Function *F = Call->getCalledFunction();
     LibFunc::Func Func;
     if (F && !F->hasLocalLinkage() && F->hasName() &&
         LibInfo->getLibFunc(F->getName(), Func) &&
-        LibInfo->has(Func))
+        LibInfo->hasOptimizedCodeGen(Func))
       return false;
   }