rjmccall added inline comments.
================
Comment at: clang/lib/CodeGen/CGCall.cpp:2321
+ !isa<llvm::StructType>(ConvertType(Arg->getType())) &&
ArgI.getCoerceToType() == ConvertType(Ty) &&
ArgI.getDirectOffset() == 0) {
----------------
I think the right fix is to change the second clause to ArgI.getCoerceToType()
== ConvertType(Arg->getType()). The point of this special case is to catch the
common case that the natural way that IRGen wants to emit the argument
expression is by producing a single scalar of exactly the right IR type; it
seems to me that that condition would capture that correctly.
https://reviews.llvm.org/D41311
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