> To handle calls to functions with byval arguments, the code generator > must create copies of those arguments. To do that efficiently, it > needs to know the alignment. > > On x86-64, all stack arguments are 8 byte aligned. I am trying to find > out how to represent that on LLVM. > > The GCC way would be to add another method to the subtarget that given > a type returns the assured stack alignment of arguments. > > Another way would be to make the FE handle the stack and issue > llvm.memcpy with the correct alignment :-)
Where do you need the representation? Loads and stores in the LLVM IR and the target-independent load and store nodes in the SelectionDAG IR have an alignment attribute; are either of those sufficient? Dan -- Dan Gohman, Cray Inc. _______________________________________________ llvm-commits mailing list [email protected] http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits
