[Bug middle-end/64388] [5 Regression] r219037 caused FAIL: gcc.dg/pr44194-1.c

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64388

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2014-12-30
     Ever confirmed|0                           |1

--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to dave.anglin from comment #1)
> On 2014-12-23, at 12:31 PM, hjl.tools at gmail dot com wrote:
> 
> > On Linux/x86-64, r219037 caused
> > 
> > FAIL: gcc.dg/pr44194-1.c scan-rtl-dump dse1 "global deletions = (2|3)"
> > FAIL: gcc.dg/pr44194-1.c scan-rtl-dump-not final "insn[: ][^\n]*set
> > \\(mem(?![^\n]*scratch)"
> 
> The optimization could easily be restored if there was a procedure or target
> hook to provide a way
> to determine if a sibcall may read from the frame.  On hppa-linux, this
> would be true if the sibcall
> arguments were all passed in registers.  It might be possible to do this by
> analyzing the decl.

Can you add such a hook? Thanks.