[PATCH] Print repeated rtl vector elements in a nicer way

[Martin Jambor]

Hi,

this patch comes from our GCN BE branch.  Because vectors of that
architectures have many elements, RTL dumps can get quite unwieldy when
all elements are printed out all the time.  However, pretty much all the
time it is the same value repeated over and over again, which lead us to
the following patch which just prints how many times a given value
occurs.

Honza has asked me yesterday to submit this hunk upstream so here it
is.  It has passed bootstrap and testing on x86_64-linux and
aarch64-linux, OK for trunk?

Thanks,

Martin


2016-11-02  Jan Hubicka  <j...@suse.cz>
            Martin Jambor  <mjam...@suse.cz>

        * print-rtl.c (print_rtx_operand_codes_E_and_V): Print how many times
        an element is repeated istead of printing each repeated element.
---
 gcc/print-rtl.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/gcc/print-rtl.c b/gcc/print-rtl.c
index 341ecdf..9752c85 100644
--- a/gcc/print-rtl.c
+++ b/gcc/print-rtl.c
@@ -252,7 +252,20 @@ rtx_writer::print_rtx_operand_codes_E_and_V (const_rtx 
in_rtx, int idx)
        m_sawclose = 1;
 
       for (int j = 0; j < XVECLEN (in_rtx, idx); j++)
-       print_rtx (XVECEXP (in_rtx, idx, j));
+       {
+         int j1;
+
+         print_rtx (XVECEXP (in_rtx, idx, j));
+         for (j1 = j + 1; j1 < XVECLEN (in_rtx, idx); j1++)
+           if (XVECEXP (in_rtx, idx, j) != XVECEXP (in_rtx, idx, j1))
+             break;
+
+         if (j1 != j + 1)
+           {
+             fprintf (m_outfile, " repeated %ix", j1 - j);
+             j = j1;
+           }
+       }
 
       m_indent -= 2;
     }
-- 
2.10.1