--- Comment #15 from David Edelsohn <dje at gcc dot> ---
The AIX Subroutine Linkage Convention states:

"The address value in the stack pointer must be quadword-aligned. (The address
value must be a multiple of 16.)" - Stack Layout, Note 2.

I believe that requires the change that I proposed to STACK_DYNAMIC_OFFSET in
comment #10.  I will push that patch.

I'm not sure how this should be addressed for the SVR4 ELF ABI when Altivec is
not enabled.

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