[Bug gcov-profile/77698] Unrolled loop not considered hot after profiling

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77698

Martin Liška <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |ASSIGNED

--- Comment #6 from Martin Liška <marxin at gcc dot gnu.org> ---
Confirmed, I've got patch candidate for it:

diff --git a/gcc/ipa-profile.c b/gcc/ipa-profile.c
index c74f4a4a41d..7065af59ba9 100644
--- a/gcc/ipa-profile.c
+++ b/gcc/ipa-profile.c
@@ -533,11 +533,10 @@ ipa_profile (void)
                   cumulated_size * 100.0 / overall_size);
        }

-      if (threshold > get_hot_bb_threshold ()
-         || in_lto_p)
+      if (in_lto_p)
        {
          if (dump_file)
-           fprintf (dump_file, "Threshold updated.\n");
+           fprintf (dump_file, "Setting hotness threshold in LTO mode.\n");
           set_hot_bb_threshold (threshold);
        }
     }

With the patch applied, I see following .S diff:

iff -u before.s after.s
--- before.s    2018-10-09 13:40:03.464360367 +0200
+++ after.s     2018-10-09 13:38:46.246736676 +0200
@@ -56,6 +56,8 @@
        movq    %rax, (%rdi,%rcx,8)
        cmpq    %r9, %rdx
        je      .L23
+       .p2align 4,,10
+       .p2align 3
 .L6:
        movq    j(%rip), %r10
        movq    (%rsi), %r8

Which is hopefully what you expect to happen?