[PATCH] value-prof: Fix abs uses in value-prof.c [PR93962]

[Jakub Jelinek via Gcc-patches]

Hi!

Jeff has recently fixed dump_histogram_value to use std::abs instead of abs,
because on FreeBSD apparently the ::abs isn't overloaded and only has
int abs (int);
Seems on Solaris /usr/include/iso/stdlib_iso.h abs has:
int abs (int);
long abs (long);
overloads but already not
long long abs (long long);
and there is another abs use in get_nth_most_common_value, also on int64_t.
The long long std::abs (long long); overload is there only in C++11 and we
in GCC10 still support C++98.

Martin has said that a counter should never be INT64_MIN, so IMHO it is
better to use abs_hwi which will assert that.

Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?

2020-03-11  Jakub Jelinek  <ja...@redhat.com>

        PR bootstrap/93962
        * value-prof.c (dump_histogram_value): Use abs_hwi instead of
        std::abs.
        (get_nth_most_common_value): Use abs_hwi instead of abs.

--- gcc/value-prof.c.jj 2020-03-05 07:58:02.693135980 +0100
+++ gcc/value-prof.c    2020-03-10 15:51:14.094854715 +0100
@@ -266,7 +266,7 @@ dump_histogram_value (FILE *dump_file, h
          if (hist->hvalue.counters)
            {
              fprintf (dump_file, " all: %" PRId64 "%s, values: ",
-                      std::abs ((int64_t) hist->hvalue.counters[0]),
+                      (int64_t) abs_hwi (hist->hvalue.counters[0]),
                       hist->hvalue.counters[0] < 0
                       ? " (values missing)": "");
              for (unsigned i = 0; i < GCOV_TOPN_VALUES; i++)
@@ -743,7 +743,7 @@ get_nth_most_common_value (gimple *stmt,
   *count = 0;
   *value = 0;
 
-  gcov_type read_all = abs (hist->hvalue.counters[0]);
+  gcov_type read_all = abs_hwi (hist->hvalue.counters[0]);
 
   gcov_type v = hist->hvalue.counters[2 * n + 1];
   gcov_type c = hist->hvalue.counters[2 * n + 2];

        Jakub