[gcc(refs/users/meissner/heads/work139-dmf)] PowerPC: Make -mcpu=future enable -mblock-ops-vector-pair.

[gcc(refs/users/meissner/heads/work139-dmf)] PowerPC: Make -mcpu=future enable -mblock-ops-vector-pair.

[Michael Meissner]

https://gcc.gnu.org/g:1c42ceb2d32ad91ac0d62822bccdf7ea7b4e8ef4

commit 1c42ceb2d32ad91ac0d62822bccdf7ea7b4e8ef4
Author: Michael Meissner <meissner@linux.ibm.com>
Date:   Mon Oct 16 19:05:35 2023 -0400

    PowerPC: Make -mcpu=future enable -mblock-ops-vector-pair.
    
    This patch enables generating load and store vector pair instructions when
    doing certain memory copy operations when -mcpu=future is used.  In doing tests
    on power10, it was determined that using these instructions were problematical
    in a few cases, so we disabled generating them by default.  This patch
    re-enabled generating these instructions if -mcpu=future is used.
    
    The patches have been tested on the following platforms.  I added the patches
    for PR target/107299 that I submitted on November 2nd before doing the builds so
    that GCC would build on systems using IEEE 128-bit long double.
        *   https://gcc.gnu.org/pipermail/gcc-patches/2022-November/604834.html
    
    2023-10-16   Michael Meissner  <meissner@linux.ibm.com>
    
    gcc/
    
            * config/rs6000/rs6000-cpus.def (ISA_FUTURE_MASKS): Add
            -mblock-ops-vector-pair.
            (POWERPC_MASKS): Likewise.

Diff:
---
 gcc/config/rs6000/rs6000-cpus.def | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/gcc/config/rs6000/rs6000-cpus.def b/gcc/config/rs6000/rs6000-cpus.def
index a6d9d7bf9a8e..849af6b3ac8c 100644
--- a/gcc/config/rs6000/rs6000-cpus.def
+++ b/gcc/config/rs6000/rs6000-cpus.def
@@ -90,6 +90,7 @@
 
 /* Flags for a potential future processor that may or may not be delivered.  */
 #define ISA_FUTURE_MASKS	(ISA_3_1_MASKS_SERVER			\
+				 | OPTION_MASK_BLOCK_OPS_VECTOR_PAIR	\
 				 | OPTION_MASK_FUTURE)
 
 /* Flags that need to be turned off if -mno-power9-vector.  */
@@ -127,6 +128,7 @@
 
 /* Mask of all options to set the default isa flags based on -mcpu=<xxx>.  */
 #define POWERPC_MASKS		(OPTION_MASK_ALTIVEC			\
+				 | OPTION_MASK_BLOCK_OPS_VECTOR_PAIR	\
 				 | OPTION_MASK_CMPB			\
 				 | OPTION_MASK_CRYPTO			\
 				 | OPTION_MASK_DFP			\