[Bug target/68369] Unnecessary copying esp to ebp with regparm={1,2,3} on x86 at -Os

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68369

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization
             Target|                            |i?86-*-*
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2015-11-16
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
I believe on i?86 with -Os we have the frame pointer enabled by default because
usually that gives smaller code (for argument stack slot accesses).  Try
-Os -fomit-frame-pointer.

This is a missed-optimization (when no frame is actually needed).