[Bug target/52828] powerpc -m32 -Os writes register saves below stack

[amodra at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52828

--- Comment #1 from Alan Modra <amodra at gcc dot gnu.org> 2012-04-12 22:26:28 UTC ---
Author: amodra
Date: Thu Apr 12 22:26:24 2012
New Revision: 186397

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=186397
Log:
    PR target/52828
    * config/rs6000/rs6000.c (rs6000_emit_stack_tie): Rewrite with
    tie regs on destination of sets.  Delete forward declaration.
    (rs6000_emit_stack_reset): Update rs6000_emit_stack_tie calls.
    (rs6000_emit_prologue): Likewise.
    (rs6000_emit_epilogue): Likewise.  Use in place of gen_frame_tie
    and gen_stack_tie.
    (is_mem_ref): Use tie_operand to recognise stack ties.
    * config/rs6000/predicates.md (tie_operand): New.
    * config/rs6000/rs6000.md (restore_stack_block): Generate new
    stack tie rtl.
    (restore_stack_nonlocal): Likewise.
    (stack_tie): Update.
    (frame_tie): Delete.


Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/rs6000/predicates.md
    trunk/gcc/config/rs6000/rs6000.c
    trunk/gcc/config/rs6000/rs6000.md