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* [Bug c/66415] New: ice in location_column_from_byte_offset
@ 2015-06-04  8:05 dcb314 at hotmail dot com
  2015-06-04  8:42 ` [Bug c/66415] [6 Regression] " mpolacek at gcc dot gnu.org
                   ` (7 more replies)
  0 siblings, 8 replies; 9+ messages in thread
From: dcb314 at hotmail dot com @ 2015-06-04  8:05 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66415

            Bug ID: 66415
           Summary: ice in location_column_from_byte_offset
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dcb314 at hotmail dot com
  Target Milestone: ---

Created attachment 35695
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35695&action=edit
C source code

gcc trunk dated 20150603 does this with the attached code

ctfCompress.c: In function ‘ctfCompress2’:
ctfCompress.c:271:4: internal compiler error: Segmentation fault
0xbcea5f crash_signal
        ../../src/trunk/gcc/toplev.c:380
0x58af2b location_column_from_byte_offset
        ../../src/trunk/gcc/c-family/c-format.c:89
0x58af2b location_from_offset
        ../../src/trunk/gcc/c-family/c-format.c:148
0x58b126 format_type_warning
        ../../src/trunk/gcc/c-family/c-format.c:2683
0x58bb8c check_format_types
        ../../src/trunk/gcc/c-family/c-format.c:2627

c-format.c:89 is

  if (*c != '"')

so maybe a reasonable bodge is to ensure c != NULL before use.
>From gcc-bugs-return-488068-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jun 04 08:17:37 2015
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From: "neleai at seznam dot cz" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/66416] New: Regression: string::find 3.5 times slower than memrchr
Date: Thu, 04 Jun 2015 08:17:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idf416

            Bug ID: 66416
           Summary: Regression: string::find 3.5 times slower than memrchr
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: neleai at seznam dot cz
  Target Milestone: ---

Same problem as with strstr also applies here. As we know length we could
compare that to memrchr. Again instead simply calling that an implementation is
3.5 times slower on my sandy_bridge.

#include <cstring>
#include <cstdlib>
#include <string>
using namespace std;

int
main()
{
  int i;
  char s[10000];
  for (i = 0; i < 10000; i++)
    s[i] = ((unsigned) rand() % 128) + 1;
  s[9999] = 0;
  int sum = 0;
  std::string foo = s;
  std::string bar;
  char *needle = strdup("needle");

  for (i = 0; i < 5000000; i++)
    {
      needle[0] = ((unsigned) rand() % 128) + 1;
#ifdef MEMRCHR
      sum += (long) memrchr(s, needle[0],9999);
#else
      sum += foo.find_last_of(needle[0]);
#endif
    }
  return sum;
}


^ permalink raw reply	[flat|nested] 9+ messages in thread
end of thread, other threads:[~2015-09-21 14:52 UTC | newest]

Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2015-06-04  8:05 [Bug c/66415] New: ice in location_column_from_byte_offset dcb314 at hotmail dot com
2015-06-04  8:42 ` [Bug c/66415] [6 Regression] " mpolacek at gcc dot gnu.org
2015-06-04  8:50 ` mpolacek at gcc dot gnu.org
2015-06-04  9:07 ` mpolacek at gcc dot gnu.org
2015-06-04  9:15 ` manu at gcc dot gnu.org
2015-06-04  9:35 ` mpolacek at gcc dot gnu.org
2015-06-08 15:16 ` mpolacek at gcc dot gnu.org
2015-06-08 15:17 ` mpolacek at gcc dot gnu.org
2015-09-21 14:52 ` manu at gcc dot gnu.org

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