[Bug target/68273] [5/6 Regression] Wrong code on mips/mipsel with -fipa-sra

joseph at codesourcery dot com gcc-bugzilla@gcc.gnu.org
Thu Jan 21 18:25:00 GMT 2016


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68273

--- Comment #9 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
On Thu, 21 Jan 2016, rguenth at gcc dot gnu.org wrote:

> With C11 aligning a type is no longer a GCC extension(?), for previous
> C versions either GCC shouldn't change the ABI or document the ABI
> extension.

C11 doesn't allow under-aligning a type and doesn't allow changing 
alignment of parameters.  "An alignment attribute shall not be specified 
in a declaration of a typedef, or a bit-field, or a function, or a 
parameter, or an object declared with the register storage-class 
specifier.".  (You're meant to be able to have structures with 
over-aligned elements, which of course could be passed as function 
arguments - each structure type would still have a fixed alignment - 
though in fact the syntax fails to allow for this; see DR#444.)


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