[mips] Mark aggregate arguments passed in registers with the inreg attribute

Summary:
This allows us to easily identify them in the backend which in turn allows us
to handle them correctly for big-endian targets (where they must be shifted
into the upper bits of the register).

Depends on D5961

Reviewers: atanasyan

Reviewed By: atanasyan

Subscribers: cfe-commits, theraven

Differential Revision: http://reviews.llvm.org/D5962

llvm-svn: 220566

1 files changed, 5 insertions, 2 deletions

diff --git a/clang/lib/CodeGen/TargetInfo.cpp b/clang/lib/CodeGen/TargetInfo.cpp
index 88ffabefe45..ea62e4e409d 100644
--- a/clang/lib/CodeGen/TargetInfo.cpp
+++ b/clang/lib/CodeGen/TargetInfo.cpp
@@ -5609,8 +5609,11 @@ MipsABIInfo::classifyArgumentType(QualType Ty, uint64_t &Offset) const {
     // If we have reached here, aggregates are passed directly by coercing to
     // another structure type. Padding is inserted if the offset of the
     // aggregate is unaligned.
-    return ABIArgInfo::getDirect(HandleAggregates(Ty, TySize), 0,
-                                 getPaddingType(OrigOffset, CurrOffset));
+    ABIArgInfo ArgInfo =
+        ABIArgInfo::getDirect(HandleAggregates(Ty, TySize), 0,
+                              getPaddingType(OrigOffset, CurrOffset));
+    ArgInfo.setInReg(true);
+    return ArgInfo;
   }
 
   // Treat an enum type as its underlying type.