[PATCH/AARCH64] v2 Add aligning of functions/loops/jumps

[Andrew Pinski]

Hi,
  This is just a rebase of
https://gcc.gnu.org/ml/gcc-patches/2014-11/msg01615.html as requested
by https://gcc.gnu.org/ml/gcc-patches/2014-11/msg01736.html.  Nothing
has changed in it.

OK?  Built and tested on aarch64-elf with no regressions.

Thanks,
Andrew Pinski

ChangeLog:

* config/aarch64/aarch64-protos.h (tune_params): Add align field.
* config/aarch64/aarch64.c (generic_tunings): Specify align.
(cortexa53_tunings): Likewise.
(cortexa57_tunings): Likewise.
(thunderx_tunings): Likewise.
(aarch64_override_options): Set align_loops, align_jumps,
align_functions based on what the tuning struct.

Index: config/aarch64/aarch64-protos.h
===================================================================
--- config/aarch64/aarch64-protos.h     (revision 217974)
+++ config/aarch64/aarch64-protos.h     (working copy)
@@ -170,6 +170,7 @@ struct tune_params
   const struct cpu_vector_cost *const vec_costs;
   const int memmov_cost;
   const int issue_rate;
+  const int align;
 };
 
 HOST_WIDE_INT aarch64_initial_elimination_offset (unsigned, unsigned);
Index: config/aarch64/aarch64.c
===================================================================
--- config/aarch64/aarch64.c    (revision 217974)
+++ config/aarch64/aarch64.c    (working copy)
@@ -314,7 +314,8 @@ static const struct tune_params generic_
   &generic_regmove_cost,
   &generic_vector_cost,
   NAMED_PARAM (memmov_cost, 4),
-  NAMED_PARAM (issue_rate, 2)
+  NAMED_PARAM (issue_rate, 2),
+  NAMED_PARAM (align, 2),
 };
 
 static const struct tune_params cortexa53_tunings =
@@ -324,7 +325,8 @@ static const struct tune_params cortexa5
   &cortexa53_regmove_cost,
   &generic_vector_cost,
   NAMED_PARAM (memmov_cost, 4),
-  NAMED_PARAM (issue_rate, 2)
+  NAMED_PARAM (issue_rate, 2),
+  NAMED_PARAM (align, 8),
 };
 
 static const struct tune_params cortexa57_tunings =
@@ -334,7 +336,8 @@ static const struct tune_params cortexa5
   &cortexa57_regmove_cost,
   &cortexa57_vector_cost,
   NAMED_PARAM (memmov_cost, 4),
-  NAMED_PARAM (issue_rate, 3)
+  NAMED_PARAM (issue_rate, 3),
+  NAMED_PARAM (align, 8),
 };
 
 static const struct tune_params thunderx_tunings =
@@ -344,7 +347,8 @@ static const struct tune_params thunderx
   &thunderx_regmove_cost,
   &generic_vector_cost,
   NAMED_PARAM (memmov_cost, 6),
-  NAMED_PARAM (issue_rate, 2)
+  NAMED_PARAM (issue_rate, 2),
+  NAMED_PARAM (align, 8),
 };
 
 /* A processor implementing AArch64.  */
@@ -6727,6 +6731,18 @@ aarch64_override_options (void)
 #endif
     }
 
+  /* If not opzimizing for size, set the default
+     alignment to what the target wants */
+  if (!optimize_size)
+    {
+      if (align_loops <= 0)
+       align_loops = aarch64_tune_params->align;
+      if (align_jumps <= 0)
+       align_jumps = aarch64_tune_params->align;
+      if (align_functions <= 0)
+       align_functions = aarch64_tune_params->align;
+    }
+
   aarch64_override_options_after_change ();
 }