Add FPExt option to CCValAssign::LocInfo. When generating calling-convention

promotion code, Tablegen will now select FPExt for floating point promotions
(previously it had returned AExt, which is not valid for floating point types).

Any out-of-tree targets that were relying on AExt being returned for FP
promotions will need to update their code check for FPExt instead.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199252 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/CallingConvLower.h

@@ -39,6 +39,7 @@ public:
     VExt,   // The value is vector-widened in the location.
             // FIXME: Not implemented yet. Code that uses AExt to mean
             // vector-widen should be fixed to use VExt instead.
+    FPExt,  // The floating-point value is fp-extended in the location.
     Indirect // The location contains pointer to the value.
     // TODO: a subset of the value is in the location.
   };

lib/Target/AArch64/AArch64ISelLowering.cpp

@@ -1220,7 +1220,8 @@ AArch64TargetLowering::LowerFormalArguments(SDValue Chain,
       break;
     case CCValAssign::SExt:
     case CCValAssign::ZExt:
-    case CCValAssign::AExt: {
+    case CCValAssign::AExt:
+    case CCValAssign::FPExt: {
       unsigned DestSize = VA.getValVT().getSizeInBits();
       unsigned DestSubReg;
 
@@ -1441,7 +1442,8 @@ AArch64TargetLowering::LowerCall(CallLoweringInfo &CLI,
     case CCValAssign::Full: break;
     case CCValAssign::SExt:
     case CCValAssign::ZExt:
-    case CCValAssign::AExt: {
+    case CCValAssign::AExt:
+    case CCValAssign::FPExt: {
       unsigned SrcSize = VA.getValVT().getSizeInBits();
       unsigned SrcSubReg;
 

lib/Target/Sparc/SparcISelLowering.cpp

@@ -271,6 +271,7 @@ SparcTargetLowering::LowerReturn_64(SDValue Chain,
 
     // Integer return values must be sign or zero extended by the callee.
     switch (VA.getLocInfo()) {
+    case CCValAssign::Full: break;
     case CCValAssign::SExt:
       OutVal = DAG.getNode(ISD::SIGN_EXTEND, DL, VA.getLocVT(), OutVal);
       break;
@@ -279,8 +280,9 @@ SparcTargetLowering::LowerReturn_64(SDValue Chain,
       break;
     case CCValAssign::AExt:
       OutVal = DAG.getNode(ISD::ANY_EXTEND, DL, VA.getLocVT(), OutVal);
-    default:
       break;
+    default:
+      llvm_unreachable("Unknown loc info!");
     }
 
     // The custom bit on an i32 return value indicates that it should be passed

lib/Target/X86/X86FastISel.cpp

@@ -2111,6 +2111,8 @@ bool X86FastISel::DoSelectCall(const Instruction *I, const char *MemIntName) {
       // FIXME: Indirect doesn't need extending, but fast-isel doesn't fully
       // support this.
       return false;
+    case CCValAssign::FPExt:
+      llvm_unreachable("Unexpected loc info!");
     }
 
     if (VA.isRegLoc()) {

lib/Target/X86/X86ISelLowering.cpp

@@ -1840,6 +1840,9 @@ X86TargetLowering::LowerReturn(SDValue Chain,
     else if (VA.getLocInfo() == CCValAssign::BCvt)
       ValToCopy = DAG.getNode(ISD::BITCAST, dl, VA.getLocVT(), ValToCopy);
 
+    assert(VA.getLocInfo() != CCValAssign::FPExt &&
+           "Unexpected FP-extend for return value.");  
+
     // If this is x86-64, and we disabled SSE, we can't return FP values,
     // or SSE or MMX vectors.
     if ((ValVT == MVT::f32 || ValVT == MVT::f64 ||

utils/TableGen/CallingConvEmitter.cpp

@@ -193,13 +193,18 @@ void CallingConvEmitter::EmitAction(Record *Action,
       O << IndentStr << "return false;\n";
     } else if (Action->isSubClassOf("CCPromoteToType")) {
       Record *DestTy = Action->getValueAsDef("DestTy");
-      O << IndentStr << "LocVT = " << getEnumName(getValueType(DestTy)) <<";\n";
-      O << IndentStr << "if (ArgFlags.isSExt())\n"
-        << IndentStr << IndentStr << "LocInfo = CCValAssign::SExt;\n"
-        << IndentStr << "else if (ArgFlags.isZExt())\n"
-        << IndentStr << IndentStr << "LocInfo = CCValAssign::ZExt;\n"
-        << IndentStr << "else\n"
-        << IndentStr << IndentStr << "LocInfo = CCValAssign::AExt;\n";
+      MVT::SimpleValueType DestVT = getValueType(DestTy);
+      O << IndentStr << "LocVT = " << getEnumName(DestVT) <<";\n";
+      if (MVT(DestVT).isFloatingPoint()) {
+        O << IndentStr << "LocInfo = CCValAssign::FPExt;\n";
+      } else {
+        O << IndentStr << "if (ArgFlags.isSExt())\n"
+          << IndentStr << IndentStr << "LocInfo = CCValAssign::SExt;\n"
+          << IndentStr << "else if (ArgFlags.isZExt())\n"
+          << IndentStr << IndentStr << "LocInfo = CCValAssign::ZExt;\n"
+          << IndentStr << "else\n"
+          << IndentStr << IndentStr << "LocInfo = CCValAssign::AExt;\n";
+      }
     } else if (Action->isSubClassOf("CCBitConvertToType")) {
       Record *DestTy = Action->getValueAsDef("DestTy");
       O << IndentStr << "LocVT = " << getEnumName(getValueType(DestTy)) <<";\n";