[MIPS] fix extension of integer types (function calls)

On MIPS unsigned int type should not be zero extended but sign-extended.

Patch by Strahinja Petrovic.

Differential Revision: http://reviews.llvm.org/D9198

llvm-svn: 238200

1 files changed, 15 insertions, 0 deletions

diff --git a/clang/lib/CodeGen/TargetInfo.cpp b/clang/lib/CodeGen/TargetInfo.cpp
index 3b09d4b93f4..53154b513eb 100644
--- a/clang/lib/CodeGen/TargetInfo.cpp
+++ b/clang/lib/CodeGen/TargetInfo.cpp
@@ -108,6 +108,10 @@ bool ABIInfo::isHomogeneousAggregateSmallEnough(const Type *Base,
   return false;
 }
 
+bool ABIInfo::shouldSignExtUnsignedType(QualType Ty) const {
+  return false;
+}
+
 void ABIArgInfo::dump() const {
   raw_ostream &OS = llvm::errs();
   OS << "(ABIArgInfo Kind=";
@@ -5547,6 +5551,7 @@ public:
   void computeInfo(CGFunctionInfo &FI) const override;
   llvm::Value *EmitVAArg(llvm::Value *VAListAddr, QualType Ty,
                          CodeGenFunction &CGF) const override;
+  bool shouldSignExtUnsignedType(QualType Ty) const override;
 };
 
 class MIPSTargetCodeGenInfo : public TargetCodeGenInfo {
@@ -5849,6 +5854,16 @@ llvm::Value* MipsABIInfo::EmitVAArg(llvm::Value *VAListAddr, QualType Ty,
   return AddrTyped;
 }
 
+bool MipsABIInfo::shouldSignExtUnsignedType(QualType Ty) const {
+  int TySize = getContext().getTypeSize(Ty);
+  
+  // MIPS64 ABI requires unsigned 32 bit integers to be sign extended.
+  if (Ty->isUnsignedIntegerOrEnumerationType() && TySize == 32)
+    return true;
+  
+  return false;
+}
+
 bool
 MIPSTargetCodeGenInfo::initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF,
                                                llvm::Value *Address) const {