[PATCH] Make fdump-tree-sccp-details more complete

[Tom de Vries <Tom_deVries at mentor dot com>]

Hi,

pass_scev_cprop contains a bit where it replaces uses of an ssa-name 
with constants.  This is currently not noted in the dump-file, even with 
TDF_DETAILS.

This patch adds that information in the dump-file, in this format:
...
Replacing uses of: D__lsm.10_34 with: 10000
...

OK for trunk if bootstrap and reg-test succeeds?

Thanks,
- Tom

Make fdump-tree-sccp-details more complete

2015-11-16  Tom de Vries  <tom@codesourcery.com>

	* tree-scalar-evolution.c (scev_const_prop): Dump details if replacing
	uses of ssa_name with constant.

---
 gcc/tree-scalar-evolution.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/gcc/tree-scalar-evolution.c b/gcc/tree-scalar-evolution.c
index e90aafb..27630f0 100644
--- a/gcc/tree-scalar-evolution.c
+++ b/gcc/tree-scalar-evolution.c
@@ -3465,7 +3465,17 @@ scev_const_prop (void)
 
 	  /* Replace the uses of the name.  */
 	  if (name != ev)
-	    replace_uses_by (name, ev);
+	    {
+	      if (dump_file && (dump_flags & TDF_DETAILS))
+		{
+		  fprintf (dump_file, "Replacing uses of: ");
+		  print_generic_expr (dump_file, name, 0);
+		  fprintf (dump_file, " with: ");
+		  print_generic_expr (dump_file, ev, 0);
+		  fprintf (dump_file, "\n");
+		}
+	      replace_uses_by (name, ev);
+	    }
 
 	  if (!ssa_names_to_remove)
 	    ssa_names_to_remove = BITMAP_ALLOC (NULL);