http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59799
Bug ID: 59799
Summary: aarch64_pass_by_reference never passes arrays by
value, contrary to ABI documentation
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: michael.hudson at linaro dot org
It's always possible I'm totally misunderstanding something here, but it seems
that this code:
/* Arrays always passed by reference. */
if (TREE_CODE (type) == ARRAY_TYPE)
return true;
in gcc/config/aarch64/aarch64.c does not agree with the rules from "Procedure
Call Standard for the ARM 64-bit Architecture"
(http://infocenter.arm.com/help/topic/com.arm.doc.ihi0055b/IHI0055B_aapcs64.pdf).
As far as I can see the rules on page 18 and 19 make no distinction between
arrays and structs and they can both be passed in registers when small enough.
