fix 2xi16 to pass as i32 instead of <2 x i16>. The former passes in

memory (as required) the later now passes in an xmm register.  This
fixes gcc.dg/compat/vector_1 on x86-32.

llvm-svn: 112211

1 files changed, 19 insertions, 0 deletions

diff --git a/clang/lib/CodeGen/TargetInfo.cpp b/clang/lib/CodeGen/TargetInfo.cpp
index 958f740bec3..05bea0cf859 100644
--- a/clang/lib/CodeGen/TargetInfo.cpp
+++ b/clang/lib/CodeGen/TargetInfo.cpp
@@ -589,6 +589,25 @@ ABIArgInfo X86_32ABIInfo::classifyArgumentType(QualType Ty) const {
     return getIndirectResult(Ty);
   }
 
+  if (const VectorType *VT = Ty->getAs<VectorType>()) {
+    // On Darwin, some vectors are returned in registers.
+    if (IsDarwinVectorABI) {
+      uint64_t Size = getContext().getTypeSize(Ty);
+      
+       // Always return in register if it fits in a general purpose
+      // register, or if it is 64 bits and has a single element.
+      if ((Size == 8 || Size == 16 || Size == 32) ||
+          (Size == 64 && VT->getNumElements() == 1))
+        return ABIArgInfo::getDirect(llvm::IntegerType::get(getVMContext(),
+                                                            Size));
+      
+      return ABIArgInfo::getIndirect(0);
+    }
+    
+    return ABIArgInfo::getDirect();
+  }
+  
+  
   if (const EnumType *EnumTy = Ty->getAs<EnumType>())
     Ty = EnumTy->getDecl()->getIntegerType();