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Re: [testsuite] Fix gcc.dg/ipa/ipa-icf-2[18].c on Solaris


On Thu, Oct 23, 2014 at 3:54 PM, Uros Bizjak <ubizjak@gmail.com> wrote:

>>> Ok, will try that.  Still no idea why Linux/x86 and Solaris/x86 are
>>> different here.
>>
>> Why do you think so?  I certainly have:
>> FAIL: gcc.dg/ipa/ipa-icf-21.c (test for excess errors)
>> UNRESOLVED: gcc.dg/ipa/ipa-icf-21.c scan-ipa-dump icf "Equal symbols: 1"
>> UNRESOLVED: gcc.dg/ipa/ipa-icf-21.c scan-ipa-dump icf "Semantic equality
>> hit:bar->foo"
>> in my i686-linux test_summary log.  It really depends on how the compiler
>
> Right, but on i386-pc-solaris2.11 it passes.
>
>> is configured, if it defaults to march that has sse/sse2 by default, it will
>> succeed, otherwise it will not.
>
> For some reason, I hit a division by zero on alphaev68-linux-gnu in
> the report generation code:
>
> Starting program: /space/uros/gcc-build/prev-gcc/cc1 -O2
> -fdump-ipa-icf -quiet ipa-icf-14.i
>
> Program received signal SIGFPE, Arithmetic exception.
> ipa_icf::sem_item_optimizer::merge_classes (this=0x12187dd80,
> prev_class_count=3) at
> /space/homedirs/uros/gcc-svn/trunk/gcc/ipa-icf.c:2203
> 2203                   non_singular_classes_count);
> (gdb) list
> 2198          fprintf (dump_file, "Average class size before: %.2f,
> after: %.2f\n",
> 2199                   1.0f * item_count / prev_class_count,
> 2200                   1.0f * item_count / class_count);
> 2201          fprintf (dump_file, "Average non-singular class size:
> %.2f, count: %u\n",
> 2202                   1.0f * non_singular_classes_sum /
> non_singular_classes_count,
> 2203                   non_singular_classes_count);
> 2204          fprintf (dump_file, "Equal symbols: %u\n", equal_items);
> 2205          fprintf (dump_file, "Fraction of visited symbols: %.2f%%\n\n",
> 2206                   100.0f * equal_items / item_count);
> 2207        }
> (gdb) p non_singular_classes_count
> $1 = 0

Also:

(gdb) p non_singular_classes_sum
$1 = 0

This creates a nice NaN which can throw an exception.

(gdb) bt
#0  ipa_icf::sem_item_optimizer::merge_classes (this=0x12187dd80,
prev_class_count=3)
    at /space/homedirs/uros/gcc-svn/trunk/gcc/ipa-icf.c:2203
#1  0x0000000121255c70 in ipa_icf::sem_item_optimizer::execute
(this=0x12187dd80) at
/space/homedirs/uros/gcc-svn/trunk/gcc/ipa-icf.c:1602
#2  0x000000012125999c in ipa_icf::ipa_icf_driver () at
/space/homedirs/uros/gcc-svn/trunk/gcc/ipa-icf.c:2319
#3  0x000000012125a46c in ipa_icf::pass_ipa_icf::execute
(this=0x121850f20) at
/space/homedirs/uros/gcc-svn/trunk/gcc/ipa-icf.c:2367
#4  0x00000001209c10c4 in execute_one_pass (pass=0x121850f20) at
/space/homedirs/uros/gcc-svn/trunk/gcc/passes.c:2156
#5  0x00000001209c26f4 in execute_ipa_pass_list (pass=0x121850f20) at
/space/homedirs/uros/gcc-svn/trunk/gcc/passes.c:2550
#6  0x000000012048fcdc in ipa_passes () at
/space/homedirs/uros/gcc-svn/trunk/gcc/cgraphunit.c:2057

Uros.


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