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>

llvm-svn: 161232

6 files changed, 26 insertions, 15 deletions

diff --git a/llvm/lib/Target/ARM/ARMFastISel.cpp b/llvm/lib/Target/ARM/ARMFastISel.cpp
index 29f90b768ee..57f81160394 100644
--- a/llvm/lib/Target/ARM/ARMFastISel.cpp
+++ b/llvm/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;
   }
 }
diff --git a/llvm/lib/Target/ARM/ARMISelLowering.cpp b/llvm/lib/Target/ARM/ARMISelLowering.cpp
index 119dc5bb006..7d8222927bb 100644
--- a/llvm/lib/Target/ARM/ARMISelLowering.cpp
+++ b/llvm/lib/Target/ARM/ARMISelLowering.cpp
@@ -1041,8 +1041,9 @@ const TargetRegisterClass *ARMTargetLowering::getRegClassFor(EVT VT) const {
 
 // Create a fast isel object.
 FastISel *
-ARMTargetLowering::createFastISel(FunctionLoweringInfo &funcInfo) const {
-  return ARM::createFastISel(funcInfo);
+ARMTargetLowering::createFastISel(FunctionLoweringInfo &funcInfo,
+                                  const TargetLibraryInfo *libInfo) const {
+  return ARM::createFastISel(funcInfo, libInfo);
 }
 
 /// getMaximalGlobalOffset - Returns the maximal possible offset which can
diff --git a/llvm/lib/Target/ARM/ARMISelLowering.h b/llvm/lib/Target/ARM/ARMISelLowering.h
index 7ad48b9b53b..213af20ebd1 100644
--- a/llvm/lib/Target/ARM/ARMISelLowering.h
+++ b/llvm/lib/Target/ARM/ARMISelLowering.h
@@ -361,7 +361,8 @@ namespace llvm {
 
     /// createFastISel - This method returns a target specific FastISel object,
     /// or null if the target does not support "fast" ISel.
-    virtual FastISel *createFastISel(FunctionLoweringInfo &funcInfo) const;
+    virtual FastISel *createFastISel(FunctionLoweringInfo &funcInfo,
+                                     const TargetLibraryInfo *libInfo) const;
 
     Sched::Preference getSchedulingPreference(SDNode *N) const;
 
@@ -544,7 +545,8 @@ namespace llvm {
 
 
   namespace ARM {
-    FastISel *createFastISel(FunctionLoweringInfo &funcInfo);
+    FastISel *createFastISel(FunctionLoweringInfo &funcInfo,
+                             const TargetLibraryInfo *libInfo);
   }
 }
 
diff --git a/llvm/lib/Target/X86/X86FastISel.cpp b/llvm/lib/Target/X86/X86FastISel.cpp
index 1e97fe764f5..72ff4e8e8d9 100644
--- a/llvm/lib/Target/X86/X86FastISel.cpp
+++ b/llvm/lib/Target/X86/X86FastISel.cpp
@@ -57,7 +57,9 @@ class X86FastISel : public FastISel {
   bool X86ScalarSSEf32;
 
 public:
-  explicit X86FastISel(FunctionLoweringInfo &funcInfo) : FastISel(funcInfo) {
+  explicit X86FastISel(FunctionLoweringInfo &funcInfo,
+                       const TargetLibraryInfo *libInfo)
+    : FastISel(funcInfo, libInfo) {
     Subtarget = &TM.getSubtarget<X86Subtarget>();
     StackPtr = Subtarget->is64Bit() ? X86::RSP : X86::ESP;
     X86ScalarSSEf64 = Subtarget->hasSSE2();
@@ -2199,7 +2201,8 @@ bool X86FastISel::TryToFoldLoad(MachineInstr *MI, unsigned OpNo,
 
 
 namespace llvm {
-  FastISel *X86::createFastISel(FunctionLoweringInfo &funcInfo) {
-    return new X86FastISel(funcInfo);
+  FastISel *X86::createFastISel(FunctionLoweringInfo &funcInfo,
+                                const TargetLibraryInfo *libInfo) {
+    return new X86FastISel(funcInfo, libInfo);
   }
 }
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
index 7802f93140f..1a614c165ab 100644
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -2896,8 +2896,9 @@ X86TargetLowering::IsEligibleForTailCallOptimization(SDValue Callee,
 }
 
 FastISel *
-X86TargetLowering::createFastISel(FunctionLoweringInfo &funcInfo) const {
-  return X86::createFastISel(funcInfo);
+X86TargetLowering::createFastISel(FunctionLoweringInfo &funcInfo,
+                                  const TargetLibraryInfo *libInfo) const {
+  return X86::createFastISel(funcInfo, libInfo);
 }
 
 
diff --git a/llvm/lib/Target/X86/X86ISelLowering.h b/llvm/lib/Target/X86/X86ISelLowering.h
index 3bc2e31ce5c..1b2d3ddc1ba 100644
--- a/llvm/lib/Target/X86/X86ISelLowering.h
+++ b/llvm/lib/Target/X86/X86ISelLowering.h
@@ -670,7 +670,8 @@ namespace llvm {
 
     /// createFastISel - This method returns a target specific FastISel object,
     /// or null if the target does not support "fast" ISel.
-    virtual FastISel *createFastISel(FunctionLoweringInfo &funcInfo) const;
+    virtual FastISel *createFastISel(FunctionLoweringInfo &funcInfo,
+                                     const TargetLibraryInfo *libInfo) const;
 
     /// getStackCookieLocation - Return true if the target stores stack
     /// protector cookies at a fixed offset in some non-standard address
@@ -947,7 +948,8 @@ namespace llvm {
   };
 
   namespace X86 {
-    FastISel *createFastISel(FunctionLoweringInfo &funcInfo);
+    FastISel *createFastISel(FunctionLoweringInfo &funcInfo,
+                             const TargetLibraryInfo *libInfo);
   }
 }