[PATCH v5 1/4] rs6000: Enable REE pass by default

[PATCH v5 1/4] rs6000: Enable REE pass by default

[Ajit Agarwal]

Hello All:

This patch enable ree pass as a default pass for rs6000 target.
Bootstrapped and regtested for powerpc64-linux-gnu.

Thanks & Regards
Ajit

	rs6000: Enable REE pass by default

	Add ree pass as a default pass for rs6000 target for
	O2 and above.

 	2023-05-16  Ajit Kumar Agarwal  <aagarwa1@linux.ibm.com>

gcc/ChangeLog:

	* common/config/rs6000/rs6000-common.cc: Add REE pass as a
	default rs6000 target pass for O2 and above.
	* doc/invoke.texi: Document -free
---
 gcc/common/config/rs6000/rs6000-common.cc | 2 ++
 gcc/doc/invoke.texi                       | 4 ++--
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/gcc/common/config/rs6000/rs6000-common.cc b/gcc/common/config/rs6000/rs6000-common.cc
index 2140c442ba9..968db215028 100644
--- a/gcc/common/config/rs6000/rs6000-common.cc
+++ b/gcc/common/config/rs6000/rs6000-common.cc
@@ -34,6 +34,8 @@ static const struct default_options rs6000_option_optimization_table[] =
     { OPT_LEVELS_ALL, OPT_fsplit_wide_types_early, NULL, 1 },
     /* Enable -fsched-pressure for first pass instruction scheduling.  */
     { OPT_LEVELS_1_PLUS, OPT_fsched_pressure, NULL, 1 },
+    /* Enable -free for zero extension and sign extension elimination.*/
+    { OPT_LEVELS_2_PLUS, OPT_free, NULL, 1 },
     /* Enable -munroll-only-small-loops with -funroll-loops to unroll small
        loops at -O2 and above by default.  */
     { OPT_LEVELS_2_PLUS_SPEED_ONLY, OPT_funroll_loops, NULL, 1 },
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index b92b8576027..168fcc88b1d 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -12455,8 +12455,8 @@ Attempt to remove redundant extension instructions.  This is especially
 helpful for the x86-64 architecture, which implicitly zero-extends in 64-bit
 registers after writing to their lower 32-bit half.
 
-Enabled for Alpha, AArch64 and x86 at levels @option{-O2},
-@option{-O3}, @option{-Os}.
+Enabled for Alpha, AArch64, RS/6000, RISC-V, SPARC, h83000 and x86 at levels 
+@option{-O2}, @option{-O3}, @option{-Os}.
 
 @opindex fno-lifetime-dse
 @opindex flifetime-dse
-- 
2.31.1

Re: [PATCH v5 1/4] rs6000: Enable REE pass by default

[Segher Boessenkool]

Hi!

On Tue, May 16, 2023 at 11:45:28AM +0530, Ajit Agarwal wrote:
> --- a/gcc/doc/invoke.texi
> +++ b/gcc/doc/invoke.texi
> @@ -12455,8 +12455,8 @@ Attempt to remove redundant extension instructions.  This is especially
>  helpful for the x86-64 architecture, which implicitly zero-extends in 64-bit
>  registers after writing to their lower 32-bit half.
>  
> -Enabled for Alpha, AArch64 and x86 at levels @option{-O2},
> -@option{-O3}, @option{-Os}.
> +Enabled for Alpha, AArch64, RS/6000, RISC-V, SPARC, h83000 and x86 at levels 
> +@option{-O2}, @option{-O3}, @option{-Os}.

Please don't mention RS/6000, we don't support that anymore.  The
architecture we do support is called Power or PowerPC; the target
triplets are powerpc*-*-*.  rs6000-*-* might still somewhat work, but
no one should use it anymore, and we probably should delete it.

Please say PowerPC here.

With that the patch is okay for trunk.  Thank you!


Segher