[PATCH, rs6000] Re-enable vector pair memcpy/memmove expansion

[acsawdey--- via Gcc-patches]

From: Aaron Sawdey <acsaw...@linux.ibm.com>

After the MMA opaque mode patch goes in, we can re-enable
use of vector pair in the inline expansion of memcpy/memmove.

After bootstrap/regtest, OK for trunk?

Thanks,
    Aaron

gcc/
        * config/rs6000/rs6000.c (rs6000_option_override_internal):
        Enable vector pair memcpy/memmove expansion.
---
 gcc/config/rs6000/rs6000.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index bb48ed92aef..53f92970414 100644
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -4117,11 +4117,10 @@ rs6000_option_override_internal (bool global_init_p)
 
   if (!(rs6000_isa_flags_explicit & OPTION_MASK_BLOCK_OPS_VECTOR_PAIR))
     {
-      /* When the POImode issues of PR96791 are resolved, then we can
-        once again enable use of vector pair for memcpy/memmove on
-        P10 if we have TARGET_MMA.  For now we make it disabled by
-        default for all targets.  */
-      rs6000_isa_flags &= ~OPTION_MASK_BLOCK_OPS_VECTOR_PAIR;
+      if (TARGET_MMA && TARGET_EFFICIENT_UNALIGNED_VSX)
+       rs6000_isa_flags |= OPTION_MASK_BLOCK_OPS_VECTOR_PAIR;
+      else
+       rs6000_isa_flags &= ~OPTION_MASK_BLOCK_OPS_VECTOR_PAIR;
     }
 
   /* Use long double size to select the appropriate long double.  We use
-- 
2.18.4