[Bug target/47192] m68k target - gcc uses stack frame after it has been unlinked when compiling with -Os

[mikpe at it dot uu.se]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47192

Mikael Pettersson <mikpe at it dot uu.se> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mikpe at it dot uu.se

--- Comment #1 from Mikael Pettersson <mikpe at it dot uu.se> 2011-01-06 
19:19:21 UTC ---
I can reproduce this with both 4.5.2 and 4.4.6 based crosses to
m68k-{elf,linux}.
The -mcpu=51qe option seems to cause mis-scheduling of the epilogue.

With -Os -S -mcpu=51qe:

.L3:
        lea (-2,%fp),%a0
        move.l -8(%fp),%d2
        unlk %fp
        move.w (%a0),stc.1197
        rts

Without the -mcpu= option:

.L3:
        move.w -2(%fp),stc.1199
        move.l -8(%fp),%d2
        unlk %fp
        rts