[gcc r12-7732] Dump when estimating the number of iterations of a loop

[gcc r12-7732] Dump when estimating the number of iterations of a loop

[Richard Biener]

https://gcc.gnu.org/g:70b8f43695b0e6fabc760d247ac83f354092b21d

commit r12-7732-g70b8f43695b0e6fabc760d247ac83f354092b21d
Author: Richard Biener <rguenther@suse.de>
Date:   Mon Mar 21 09:39:17 2022 +0100

    Dump when estimating the number of iterations of a loop
    
    Currently the dumps are somewhat inter-mangled, not showing the
    (possibly bad) recursion between niter estimation and number of
    iteration computation.  The following tries to improve deciphering
    a little bit by dumping when we do niter estimation.
    
    2022-03-21  Richard Biener  <rguenther@suse.de>
    
            * tree-ssa-loop-niter.cc (estimate_numbers_of_iterations): Dump
            we are estimating niter of loop.

Diff:
---
 gcc/tree-ssa-loop-niter.cc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/gcc/tree-ssa-loop-niter.cc b/gcc/tree-ssa-loop-niter.cc
index 9bb5097379b..afa51064953 100644
--- a/gcc/tree-ssa-loop-niter.cc
+++ b/gcc/tree-ssa-loop-niter.cc
@@ -4374,6 +4374,9 @@ estimate_numbers_of_iterations (class loop *loop)
   if (loop->estimate_state != EST_NOT_COMPUTED)
     return;
 
+  if (dump_file && (dump_flags & TDF_DETAILS))
+    fprintf (dump_file, "Estimating # of iterations of loop %d\n", loop->num);
+
   loop->estimate_state = EST_AVAILABLE;
 
   /* If we have a measured profile, use it to estimate the number of