PING Re: [PATCH 0/9] separate shrink-wrapping

[Segher Boessenkool <segher at kernel dot crashing dot org>]

Ping.

On Wed, Jun 08, 2016 at 01:47:31AM +0000, Segher Boessenkool wrote:
> This patch series introduces separate shrink-wrapping.
> 
> There are many things the prologue/epilogue of a function do, and most of
> those things can be done independently.  For example, most of the time,
> for many targets, the save of callee-saved registers can be done later
> than the "main" prologue.
> 
> Doing so helps quite a bit because the prologue is expensive for functions
> that do not need everything it does done for every path through the
> function; often, the hot paths do not need much at all, e.g. not those
> things the prologue needs to do for the function to call other functions.
> 
> The first patch creates a command-line flag, some hooks, a status flag
> ("is this function wrapped separately", used by later passes), and
> documentation for these things.
> 
> The next six patches are to prevent later passes from mishandling the
> epilogue instructions that now appear before the epilogue: mostly, you
> cannot do much to instructions with a REG_CFA_RESTORE note without
> confusing dwarf2cfi.  The cprop one is for prologue instructions.
> 
> Then, the main patch.  And finally a patch for PowerPC that implements
> separate wrapping for GPRs and LR.
> 
> Tested on powerpc64-linux (-m32/-m64, -mlra/-mno-lra), and on
> powerpc64le-linux.  Previous versions of this series also tested on
> x86_64-linux.
> 
> Is this okay for trunk?
> 
> 
> Segher
> 
> 
> Segher Boessenkool (9):
>   separate shrink-wrap: New command-line flag, status flag, hooks, and doc
>   cfgcleanup: Don't confuse CFI when -fshrink-wrap-separate
>   dce: Don't dead-code delete separately wrapped restores
>   regrename: Don't rename restores
>   regrename: Don't run if function was separately shrink-wrapped
>   sel-sched: Don't mess with register restores
>   cprop: Leave RTX_FRAME_RELATED_P instructions alone
>   shrink-wrap: shrink-wrapping for separate concerns
>   rs6000: Separate shrink-wrapping
> 
>  gcc/cfgcleanup.c           |   5 +
>  gcc/common.opt             |   4 +
>  gcc/config/rs6000/rs6000.c | 257 ++++++++++++++++--
>  gcc/dce.c                  |   9 +
>  gcc/doc/invoke.texi        |  11 +-
>  gcc/doc/tm.texi            |  53 ++++
>  gcc/doc/tm.texi.in         |  29 ++
>  gcc/emit-rtl.h             |   4 +
>  gcc/function.c             |  15 +-
>  gcc/regcprop.c             |   3 +
>  gcc/regrename.c            |  12 +-
>  gcc/sel-sched-ir.c         |   1 +
>  gcc/shrink-wrap.c          | 647 +++++++++++++++++++++++++++++++++++++++++++++
>  gcc/shrink-wrap.h          |   1 +
>  gcc/target.def             |  56 ++++
>  15 files changed, 1088 insertions(+), 19 deletions(-)
> 
> -- 
> 1.9.3