http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56314
Bug #: 56314
Summary: Please allow per-function specification of register
conventions
Classification: Unclassified
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: enhancement
Priority: P3
Component: other
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: h...@zytor.com
gcc allows register specifications (saved, clobbered, reserved) to be changed
on a per-file basis. However, for optimization uses it would be much more
useful if they could be defined on a per-function basis using attributes, just
as calling conventions can be specified with attributes.
In the Linux kernel world we currently have several uses of functions with ad
hoc calling conventions. We have to wrap them in assembly wrappers, and either
write them in assembly or put them in separate files with the calling
convention specified with compiler options.
