Fall back to selection DAG isel for calls to builtin functions.

Fast isel doesn't currently have support for translating builtin function
calls to target instructions.  For embedded environments where the library
functions are not available, this is a matter of correctness and not
just optimization.  Most of this patch is just arranging to make the
TargetLibraryInfo available in fast isel.  <rdar://problem/12008746>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161232 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 6 insertions, 4 deletions

diff --git a/lib/Target/ARM/ARMFastISel.cpp b/lib/Target/ARM/ARMFastISel.cpp
index 29f90b768e..57f8116039 100644
--- a/lib/Target/ARM/ARMFastISel.cpp
+++ b/lib/Target/ARM/ARMFastISel.cpp
@@ -87,8 +87,9 @@ class ARMFastISel : public FastISel {
   LLVMContext *Context;
 
   public:
-    explicit ARMFastISel(FunctionLoweringInfo &funcInfo)
-    : FastISel(funcInfo),
+    explicit ARMFastISel(FunctionLoweringInfo &funcInfo,
+                         const TargetLibraryInfo *libInfo)
+    : FastISel(funcInfo, libInfo),
       TM(funcInfo.MF->getTarget()),
       TII(*TM.getInstrInfo()),
       TLI(*TM.getTargetLowering()) {
@@ -2787,14 +2788,15 @@ bool ARMFastISel::TryToFoldLoad(MachineInstr *MI, unsigned OpNo,
 }
 
 namespace llvm {
-  FastISel *ARM::createFastISel(FunctionLoweringInfo &funcInfo) {
+  FastISel *ARM::createFastISel(FunctionLoweringInfo &funcInfo,
+                                const TargetLibraryInfo *libInfo) {
     // Completely untested on non-iOS.
     const TargetMachine &TM = funcInfo.MF->getTarget();
 
     // Darwin and thumb1 only for now.
     const ARMSubtarget *Subtarget = &TM.getSubtarget<ARMSubtarget>();
     if (Subtarget->isTargetIOS() && !Subtarget->isThumb1Only())
-      return new ARMFastISel(funcInfo);
+      return new ARMFastISel(funcInfo, libInfo);
     return 0;
   }
 }