[PATCH/AARCH64] Have the verbose cost model output output be controllable

[Andrew Pinski <pinskia@gmail.com>]

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Hi,
  As reported in PR 61367, the aarch64 back-end is too verbose when it
is dealing with the cost model.  I tend to agree, no other back-end is
this verbose.  So I decided to add an option to enable this verbose
output if requested.

I did NOT document it in invoke.texi because I don't feel like this is
an option which an user should use.  But I can add it if requested.

OK?  Bootstrapped and tested on aarch64-linux-gnu with no regressions.

Thanks,
Andrew Pinski

ChangeLog:
* config/aarch64/aarch64.opt (mverbose-cost-dump): New option.
* config/aarch64/aarch64.c (aarch64_rtx_costs): Use
flag_aarch64_verbose_cost instead of checking for details dump.
(aarch64_rtx_costs_wrapper): Likewise.

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Index: config/aarch64/aarch64.c
===================================================================
--- config/aarch64/aarch64.c	(revision 240461)
+++ config/aarch64/aarch64.c	(working copy)
@@ -7351,7 +7351,8 @@
       break;
     }
 
-  if (dump_file && (dump_flags & TDF_DETAILS))
+  if (dump_file
+      && flag_aarch64_verbose_cost)
     fprintf (dump_file,
       "\nFailed to cost RTX.  Assuming default cost.\n");
 
@@ -7367,7 +7368,8 @@
 {
   bool result = aarch64_rtx_costs (x, mode, outer, param, cost, speed);
 
-  if (dump_file && (dump_flags & TDF_DETAILS))
+  if (dump_file
+      && flag_aarch64_verbose_cost)
     {
       print_rtl_single (dump_file, x);
       fprintf (dump_file, "\n%s cost: %d (%s)\n",
Index: config/aarch64/aarch64.opt
===================================================================
--- config/aarch64/aarch64.opt	(revision 240461)
+++ config/aarch64/aarch64.opt	(working copy)
@@ -167,3 +167,7 @@
 Enable the division approximation.  Enabling this reduces
 precision of division results to about 16 bits for
 single precision and to 32 bits for double precision.
+
+mverbose-cost-dump
+Common Var(flag_aarch64_verbose_cost)
+Enables verbose cost model dummping in the debug dump files.