Allow targets to specify their choice of calling conventions per

libcall. Take advantage of this in the ARM backend to rectify broken
choice of CC when hard float is in effect. PIC16 may want to see if
it could be of use in MakePIC16Libcall, which works unchanged.

Patch by Sandeep!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79033 91177308-0d34-0410-b5e6-96231b3b80d8

4 files changed, 17 insertions, 5 deletions

diff --git a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
index ab4ebef..66469ef 100644
--- a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
@@ -1869,7 +1869,7 @@ SDValue SelectionDAGLegalize::ExpandLibCall(RTLIB::Libcall LC, SDNode *Node,
   const Type *RetTy = Node->getValueType(0).getTypeForEVT(*DAG.getContext());
   std::pair<SDValue, SDValue> CallInfo =
     TLI.LowerCallTo(InChain, RetTy, isSigned, !isSigned, false, false,
-                    0, CallingConv::C, false,
+                    0, TLI.getLibcallCallingConv(LC), false,
                     /*isReturnValueUsed=*/true,
                     Callee, Args, DAG,
                     Node->getDebugLoc());
diff --git a/lib/CodeGen/SelectionDAG/LegalizeTypes.cpp b/lib/CodeGen/SelectionDAG/LegalizeTypes.cpp
index 11ec9f1..1518317 100644
--- a/lib/CodeGen/SelectionDAG/LegalizeTypes.cpp
+++ b/lib/CodeGen/SelectionDAG/LegalizeTypes.cpp
@@ -1019,7 +1019,7 @@ SDValue DAGTypeLegalizer::MakeLibCall(RTLIB::Libcall LC, EVT RetVT,
   const Type *RetTy = RetVT.getTypeForEVT(*DAG.getContext());
   std::pair<SDValue,SDValue> CallInfo =
     TLI.LowerCallTo(DAG.getEntryNode(), RetTy, isSigned, !isSigned, false,
-                    false, 0, CallingConv::C, false,
+                    false, 0, TLI.getLibcallCallingConv(LC), false,
                     /*isReturnValueUsed=*/true,
                     Callee, Args, DAG, dl);
   return CallInfo.first;
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index afcbc09..5d4717a 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -3390,7 +3390,8 @@ SDValue SelectionDAG::getMemcpy(SDValue Chain, DebugLoc dl, SDValue Dst,
   // FIXME: pass in DebugLoc
   std::pair<SDValue,SDValue> CallResult =
     TLI.LowerCallTo(Chain, Type::getVoidTy(*getContext()),
-                    false, false, false, false, 0, CallingConv::C, false,
+                    false, false, false, false, 0,
+                    TLI.getLibcallCallingConv(RTLIB::MEMCPY), false,
                     /*isReturnValueUsed=*/false,
                     getExternalSymbol(TLI.getLibcallName(RTLIB::MEMCPY), 
                                       TLI.getPointerTy()),
@@ -3438,7 +3439,8 @@ SDValue SelectionDAG::getMemmove(SDValue Chain, DebugLoc dl, SDValue Dst,
   // FIXME:  pass in DebugLoc
   std::pair<SDValue,SDValue> CallResult =
     TLI.LowerCallTo(Chain, Type::getVoidTy(*getContext()),
-                    false, false, false, false, 0, CallingConv::C, false,
+                    false, false, false, false, 0,
+                    TLI.getLibcallCallingConv(RTLIB::MEMMOVE), false,
                     /*isReturnValueUsed=*/false,
                     getExternalSymbol(TLI.getLibcallName(RTLIB::MEMMOVE), 
                                       TLI.getPointerTy()),
@@ -3496,7 +3498,8 @@ SDValue SelectionDAG::getMemset(SDValue Chain, DebugLoc dl, SDValue Dst,
   // FIXME: pass in DebugLoc
   std::pair<SDValue,SDValue> CallResult =
     TLI.LowerCallTo(Chain, Type::getVoidTy(*getContext()),
-                    false, false, false, false, 0, CallingConv::C, false,
+                    false, false, false, false, 0,
+                    TLI.getLibcallCallingConv(RTLIB::MEMSET), false,
                     /*isReturnValueUsed=*/false,
                     getExternalSymbol(TLI.getLibcallName(RTLIB::MEMSET), 
                                       TLI.getPointerTy()),
diff --git a/lib/CodeGen/SelectionDAG/TargetLowering.cpp b/lib/CodeGen/SelectionDAG/TargetLowering.cpp
index 767238e..3414fee 100644
--- a/lib/CodeGen/SelectionDAG/TargetLowering.cpp
+++ b/lib/CodeGen/SelectionDAG/TargetLowering.cpp
@@ -247,6 +247,14 @@ static void InitLibcallNames(const char **Names) {
   Names[RTLIB::UNWIND_RESUME] = "_Unwind_Resume";
 }
 
+/// InitLibcallCallingConvs - Set default libcall CallingConvs.
+///
+static void InitLibcallCallingConvs(CallingConv::ID *CCs) {
+  for (int i = 0; i < RTLIB::UNKNOWN_LIBCALL; ++i) {
+    CCs[i] = CallingConv::C;
+  }
+}
+
 /// getFPEXT - Return the FPEXT_*_* value for the given types, or
 /// UNKNOWN_LIBCALL if there is none.
 RTLIB::Libcall RTLIB::getFPEXT(EVT OpVT, EVT RetVT) {
@@ -520,6 +528,7 @@ TargetLowering::TargetLowering(TargetMachine &tm,TargetLoweringObjectFile *tlof)
 
   InitLibcallNames(LibcallRoutineNames);
   InitCmpLibcallCCs(CmpLibcallCCs);
+  InitLibcallCallingConvs(LibcallCallingConvs);
 
   // Tell Legalize whether the assembler supports DEBUG_LOC.
   const TargetAsmInfo *TASM = TM.getTargetAsmInfo();