[PATCH][ARM] Enable fusion of AES instructions

[Wilco Dijkstra]

Enable instruction fusion of AES instructions on ARM for Cortex-A53 and
Cortex-A57. 

OK for commit?

ChangeLog:
2015-11-20  Wilco Dijkstra  <wdijk...@arm.com>

        * gcc/config/arm/arm.c (arm_cortex_a53_tune): Add AES fusion.
        (arm_cortex_a57_tune): Likewise.
        (aarch_macro_fusion_pair_p): Add support for AES fusion.
        * gcc/config/arm/arm-protos.h (fuse_ops): Add FUSE_AES_AESMC.

---
 gcc/config/arm/arm-protos.h | 5 +++--
 gcc/config/arm/arm.c        | 9 +++++++--
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/gcc/config/arm/arm-protos.h b/gcc/config/arm/arm-protos.h
index f9b1276..4801bb8 100644
--- a/gcc/config/arm/arm-protos.h
+++ b/gcc/config/arm/arm-protos.h
@@ -302,8 +302,9 @@ struct tune_params
   enum fuse_ops
   {
     FUSE_NOTHING   = 0,
-    FUSE_MOVW_MOVT = 1 << 0
-  } fusible_ops: 1;
+    FUSE_MOVW_MOVT = 1 << 0,
+    FUSE_AES_AESMC = 1 << 1
+  } fusible_ops: 2;
   /* Depth of scheduling queue to check for L2 autoprefetcher.  */
   enum {SCHED_AUTOPREF_OFF, SCHED_AUTOPREF_RANK, SCHED_AUTOPREF_FULL}
     sched_autopref: 2;
diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c
index 02f5dc3..7077199 100644
--- a/gcc/config/arm/arm.c
+++ b/gcc/config/arm/arm.c
@@ -1969,7 +1969,7 @@ const struct tune_params arm_cortex_a53_tune =
   tune_params::DISPARAGE_FLAGS_NEITHER,
   tune_params::PREF_NEON_64_FALSE,
   tune_params::PREF_NEON_STRINGOPS_TRUE,
-  FUSE_OPS (tune_params::FUSE_MOVW_MOVT),
+  FUSE_OPS (tune_params::FUSE_MOVW_MOVT | tune_params::FUSE_AES_AESMC),
   tune_params::SCHED_AUTOPREF_OFF
 };
 
@@ -1992,7 +1992,7 @@ const struct tune_params arm_cortex_a57_tune =
   tune_params::DISPARAGE_FLAGS_ALL,
   tune_params::PREF_NEON_64_FALSE,
   tune_params::PREF_NEON_STRINGOPS_TRUE,
-  FUSE_OPS (tune_params::FUSE_MOVW_MOVT),
+  FUSE_OPS (tune_params::FUSE_MOVW_MOVT | tune_params::FUSE_AES_AESMC),
   tune_params::SCHED_AUTOPREF_FULL
 };
 
@@ -29668,6 +29668,11 @@ aarch_macro_fusion_pair_p (rtx_insn* prev,
rtx_insn* curr)
               && REGNO (SET_DEST (curr_set)) == REGNO (SET_DEST
(prev_set)))
             return true;
     }
+
+  if (current_tune->fusible_ops & tune_params::FUSE_AES_AESMC
+      && aarch_crypto_can_dual_issue (prev, curr))
+    return true;
+
   return false;
 }
 
-- 
1.9.1