With the following change:
2004-06-08 Jason Merrill <[EMAIL PROTECTED]>
Gimplify VA_ARG_EXPR into simpler forms.
get_varargs_alias_set will always return 0, which causes us to miss some
loads/store elimination and such at the rtl level (and tree level also).
The comment in alias.c is:
/* We now lower VA_ARG_EXPR, and there's currently no way to attach the
varargs alias set to an INDIRECT_REF (FIXME!), so we can't
consistently use the varargs alias set for loads from the varargs
area. So don't use it anywhere. */
--
Summary: [4.0/4.1 Regression] get_varargs_alias_set returns 0
always
Product: gcc
Version: 4.1.0
Status: UNCONFIRMED
Keywords: missed-optimization, alias
Severity: minor
Priority: P2
Component: middle-end
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: pinskia at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24434
