PATCH: __nodebug__ attribute for use on SSE intrinsic wrappers

[Fariborz Jahanian <fjahanian at apple dot com>]

The existing GCC SSE implementation defines the Intel(tm) SSE  
intrinsics in four header files.  Almost every SSE intrinsic is  
defined as a trivial function that wraps a GCC "__builtin_xxxxxx()"  
where the builtins appear to be functions, but expand to a particular  
SSE instruction. When the inliner inlines the intrinsic call, the  
debug info includes a reference to the wrapper functions in the GCC  
header files, and stepping through a loop of SSE becomes a trial as  
GDB repeatedly drag one's attention to the wrapper functions. Apple  
developers, have requested that GDB does not step into implementation  
of wrapper functions and step over them. This patch is adaptation of  
an old Pinksi/Devang patch which Devang brought to my attention  
(thank you to both). The patch introduces a new __nodebug__ attribute  
attached to all SSE intrinsic declarations, with the desired  
behavior. Is this something that FSF would like to have as  
contribution.  Preferences  on debugging issues varies from site to  
site, so I am note sure on this.

- fariborz (fjahanian@apple.com)

ChangeLog:


2005-07-29  Fariborz Jahanian <fjahanian@apple.com>

        * c-common.c (c_common_att): New entry added for "nodebug".
        (handle_nodebug_attribute): New function.
        * tree-inline.c (call_location_p, call_location): New fields in
        struct inline_data.
        (copy_body_r): Set new location of copied tree, if available.
        (expand_call_inline): If callee's '__nodebug__' attribute is
        set, use caller's input_location for copied trees.
        * config/i386/emmintrin.h: All intrinsic functions have
        "__nodebug__" Added to their declarations.
        * config/i386/mmintrin.h: Ditto.
        * config/i386/pmmintrin.h: Ditto.
        * config/i386/xmmintrin.h: Ditto.

Attachment: fsf-patch-nodebug-attr.txt
Description: Text document

Attachment: i386-nodebug-attr.c
Description: Binary data