[Bug c/64255] New: failures with -O2 optimization on i >= 0 ? (unsigned long) i : - (unsigned long) i

[Bug c/64255] New: failures with -O2 optimization on i >= 0 ? (unsigned long) i : - (unsigned long) i

[vincent-gcc at vinc17 dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64255

            Bug ID: 64255
           Summary: failures with -O2 optimization on i >= 0 ? (unsigned
                    long) i : - (unsigned long) i
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: vincent-gcc at vinc17 dot net

I get failures when building and testing MPFR with:

gcc (Debian 20141209-1) 5.0.0 20141209 (experimental) [trunk revision 218514]

on x86_64, using:

./configure --enable-assert=full CC=gcc-snapshot 'CFLAGS=-Wall -O2 -g'

Using -O1 only makes the problems disappear.

If I simplify the MPFR code to:

int
mpfr_set_si_2exp (mpfr_ptr x, long i, mpfr_exp_t e, mpfr_rnd_t rnd_mode)
{
  if (i == 0)
    {
      return 0;
    }
  else
    {
      unsigned long ai;

      ai = i >= 0 ? (unsigned long) i : - (unsigned long) i;
      if ((i >= 0 ? (unsigned long) i : - (unsigned long) i) != ai)
        printf ("Error!\n");
      printf ("i = %ld\n", i);
      printf ("ai = %lX\n", ai);
      return 0;
    }
}

in set_si_2exp.c, and call:

  mpfr_set_si_2exp (x, 1, 0, 0);

I get:

i = 1
ai = FFFFFFFFFFFFFFFF

If I remove the

      if ((i >= 0 ? (unsigned long) i : - (unsigned long) i) != ai)
        printf ("Error!\n");

test, I get:

i = 1
ai = 1

as expected.

I don't know why, but I didn't manage to get a standalone testcase.

[Bug c/64255] failures with -O2 optimization on i >= 0 ? (unsigned long) i : - (unsigned long) i

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64255

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING
   Last reconfirmed|                            |2014-12-10
                 CC|                            |mpolacek at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Without the standalone test case we can't do much, unfortunately.  Would you
have at least the preprocessed source?

[Bug c/64255] failures with -O2 optimization on i >= 0 ? (unsigned long) i : - (unsigned long) i

[vincent-gcc at vinc17 dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64255

--- Comment #2 from Vincent Lefèvre <vincent-gcc at vinc17 dot net> ---
Created attachment 34242
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34242&action=edit
testcase part 1 (tst1.c)
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Subject: [Bug c/64255] failures with -O2 optimization on i >= 0 ? (unsigned long) i : - (unsigned long) i
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64255

--- Comment #3 from Vincent Lefèvre <vincent-gcc at vinc17 dot net> ---
Created attachment 34243
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34243&action=edit
testcase part 2 (tst2.c)
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Subject: [Bug middle-end/64225] [4.8/4.9 Regression] -funsafe-math-optimizations generates call to pow where multiply instruction would do
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idd225

--- Comment #15 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
Author: wschmidt
Date: Wed Dec 10 16:52:29 2014
New Revision: 218586

URL: https://gcc.gnu.org/viewcvs?rev!8586&root=gcc&view=rev
Log:
2014-12-10  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

    Backport from mainline:
    2014-12-09  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

    PR middle-end/64225
    * tree-ssa-reassoc.c (acceptable_pow_call): Disable transformation
    for BUILT_IN_POW when flag_errno_math is present.


Modified:
    branches/gcc-4_9-branch/gcc/ChangeLog
    branches/gcc-4_9-branch/gcc/tree-ssa-reassoc.c

[Bug c/64255] failures with -O2 optimization on i >= 0 ? (unsigned long) i : - (unsigned long) i

[vincent-gcc at vinc17 dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64255

--- Comment #4 from Vincent Lefèvre <vincent-gcc at vinc17 dot net> ---
(In reply to Marek Polacek from comment #1)
> Without the standalone test case we can't do much, unfortunately.  Would you
> have at least the preprocessed source?

It was actually a standalone test case, but one needs separate compilation to
run it:

$ gcc-snapshot -Wall -Wextra -O2 -c tst1.c
$ gcc-snapshot -Wall -Wextra -O2 -c tst2.c
$ gcc-snapshot tst1.o tst2.o -o tst
$ ./tst
i = 1
ai = FFFFFFFFFFFFFFFF
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Subject: [Bug target/64210] [5 Regression] FAIL: gcc.target/i386/avx512vl-(vmovdqa64|vpbroadcastd)-1.c  ... with -fpic
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idd210

--- Comment #2 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> Created attachment 34241 [details]
> gcc5-pr64210.patch
>
> Untested fix.

Works for me! Thanks. With the patch, using make -k check-gcc
RUNTESTFLAGS="i386.exp --target_board=unix'{-m32,-m64}'" I get

        === gcc tests ==
Schedule of variations:
    unix/-m32
    unix/-m64

Running target unix/-m32
Using /sw64/share/dejagnu/baseboards/unix.exp as board description file for
target.
Using /sw64/share/dejagnu/config/unix.exp as generic interface file for target.
Using /opt/gcc/work/gcc/testsuite/config/default.exp as
tool-and-target-specific interface file.
Running /opt/gcc/work/gcc/testsuite/gcc.target/i386/i386.exp ...
FAIL: gcc.target/i386/avx512bw-vpbroadcastb-1.c (internal compiler error)
FAIL: gcc.target/i386/avx512bw-vpbroadcastb-1.c (test for excess errors)
FAIL: gcc.target/i386/avx512bw-vpbroadcastb-1.c scan-assembler-times
vpbroadcastb[ \\t]+[^{\n]*%zmm[0-9]+(?:\n|[ \\t]+#) 2
FAIL: gcc.target/i386/avx512bw-vpbroadcastb-1.c scan-assembler-times
vpbroadcastb[ \\t]+[^{\n]*%zmm[0-9]+{%k[1-7]}(?:\n|[ \\t]+#) 2
FAIL: gcc.target/i386/avx512bw-vpbroadcastb-1.c scan-assembler-times
vpbroadcastb[ \\t]+[^{\n]*%zmm[0-9]+{%k[1-7]}{z}(?:\n|[ \\t]+#) 2
FAIL: gcc.target/i386/avx512bw-vpbroadcastb-1.c scan-assembler-times
vpbroadcastb[ \\t]+[^{\n]*%ymm[0-9]+{%k[1-7]}(?:\n|[ \\t]+#) 2
FAIL: gcc.target/i386/avx512bw-vpbroadcastb-1.c scan-assembler-times
vpbroadcastb[ \\t]+[^{\n]*%ymm[0-9]+{%k[1-7]}{z}(?:\n|[ \\t]+#) 2
FAIL: gcc.target/i386/avx512bw-vpbroadcastb-1.c scan-assembler-times
vpbroadcastb[ \\t]+[^{\n]*%xmm[0-9]+{%k[1-7]}(?:\n|[ \\t]+#) 2
FAIL: gcc.target/i386/avx512bw-vpbroadcastb-1.c scan-assembler-times
vpbroadcastb[ \\t]+[^{\n]*%xmm[0-9]+{%k[1-7]}{z}(?:\n|[ \\t]+#) 2
FAIL: gcc.target/i386/avx512bw-vpbroadcastw-1.c (internal compiler error)
FAIL: gcc.target/i386/avx512bw-vpbroadcastw-1.c (test for excess errors)
FAIL: gcc.target/i386/avx512bw-vpbroadcastw-1.c scan-assembler-times
vpbroadcastw[ \\t]+[^{\n]*%zmm[0-9]+(?:\n|[ \\t]+#) 2
FAIL: gcc.target/i386/avx512bw-vpbroadcastw-1.c scan-assembler-times
vpbroadcastw[ \\t]+[^{\n]*%zmm[0-9]+{%k[1-7]}(?:\n|[ \\t]+#) 2
FAIL: gcc.target/i386/avx512bw-vpbroadcastw-1.c scan-assembler-times
vpbroadcastw[ \\t]+[^{\n]*%zmm[0-9]+{%k[1-7]}{z}(?:\n|[ \\t]+#) 2
FAIL: gcc.target/i386/avx512bw-vpbroadcastw-1.c scan-assembler-times
vpbroadcastw[ \\t]+[^{\n]*%ymm[0-9]+{%k[1-7]}(?:\n|[ \\t]+#) 2
FAIL: gcc.target/i386/avx512bw-vpbroadcastw-1.c scan-assembler-times
vpbroadcastw[ \\t]+[^{\n]*%ymm[0-9]+{%k[1-7]}{z}(?:\n|[ \\t]+#) 2
FAIL: gcc.target/i386/avx512bw-vpbroadcastw-1.c scan-assembler-times
vpbroadcastw[ \\t]+[^{\n]*%xmm[0-9]+{%k[1-7]}(?:\n|[ \\t]+#) 2
FAIL: gcc.target/i386/avx512bw-vpbroadcastw-1.c scan-assembler-times
vpbroadcastw[ \\t]+[^{\n]*%xmm[0-9]+{%k[1-7]}{z}(?:\n|[ \\t]+#) 2
FAIL: gcc.target/i386/avx512f-gather-5.c scan-assembler-times
gather[^\n]*zmm[0-9]{%k[1-7]}(?:\n|[ \\t]+#) 2
FAIL: gcc.target/i386/avx512f-kandnw-1.c scan-assembler-times kandnw[
\\t]+[^{\n]*%k[0-7](?:\n|[ \\t]+#) 1
FAIL: gcc.target/i386/fuse-caller-save-rec.c scan-assembler-not push
FAIL: gcc.target/i386/fuse-caller-save-rec.c scan-assembler-not pop
FAIL: gcc.target/i386/fuse-caller-save-rec.c scan-assembler-times
addl\t%[re]?dx, %[re]?ax 1
FAIL: gcc.target/i386/fuse-caller-save-xmm.c scan-assembler-times addpd\t%xmm1,
%xmm0 1
FAIL: gcc.target/i386/fuse-caller-save-xmm.c scan-assembler-times
movapd\t%xmm0, %xmm1 1
FAIL: gcc.target/i386/fuse-caller-save.c scan-assembler-not push
FAIL: gcc.target/i386/fuse-caller-save.c scan-assembler-not pop
FAIL: gcc.target/i386/fuse-caller-save.c scan-assembler-times
addl\t%[re]?d[ix], %[re]?ax 1
FAIL: gcc.target/i386/pr49095.c scan-assembler-not test[lq]

        === gcc Summary for unix/-m32 ==
# of expected passes        8140
# of unexpected failures    29
# of expected failures        4
# of unsupported tests        2051
Running target unix/-m64
Using /sw64/share/dejagnu/baseboards/unix.exp as board description file for
target.
Using /sw64/share/dejagnu/config/unix.exp as generic interface file for target.
Using /opt/gcc/work/gcc/testsuite/config/default.exp as
tool-and-target-specific interface file.
Running /opt/gcc/work/gcc/testsuite/gcc.target/i386/i386.exp ...
FAIL: gcc.target/i386/pr49866.c (test for excess errors)
FAIL: gcc.target/i386/pr61599-1.c (test for excess errors)
FAIL: gcc.target/i386/pr63538.c scan-assembler movabs

        === gcc Summary for unix/-m64 ==
# of expected passes        8346
# of unexpected failures    3
# of expected failures        4
# of unresolved testcases    1
# of unsupported tests        2030

        === gcc Summary ==
# of expected passes        16486
# of unexpected failures    32
# of expected failures        8
# of unresolved testcases    1
# of unsupported tests        4081
/opt/gcc/build_w/gcc/xgcc  version 5.0.0 20141210 (experimental) [trunk
revision 218584p27] (GCC)

The first failing tests are pr64254 and the fuse-caller-save* failing tests are
due to r216154 (see pr63534 comment 69: yes I know a should open a new PR for
them).

[Bug c/64255] [5 Regression] failures with -O2 optimization on i >= 0 ? (unsigned long) i : - (unsigned long) i

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64255

Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |wrong-code
             Status|WAITING                     |NEW
                 CC|                            |trippels at gcc dot gnu.org
   Target Milestone|---                         |5.0
            Summary|failures with -O2           |[5 Regression] failures
                   |optimization on i >= 0 ?    |with -O2 optimization on i
                   |(unsigned long) i : -       |>= 0 ? (unsigned long) i :
                   |(unsigned long) i           |- (unsigned long) i
           Severity|major                       |normal

--- Comment #5 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Confirmed. Testcase can be combined to one file:

markus@x4 tmp % cat test.c
#include <stdio.h>

__attribute__((noinline))
int f (long i)
{
  if (i == 0)
    {
      return 0;
    }
  else
    {
      unsigned long ai;

      ai = i >= 0 ? (unsigned long) i : - (unsigned long) i;
      if ((i >= 0 ? (unsigned long) i : - (unsigned long) i) != ai)
        printf ("Error!\n");
      printf ("i = %ld\n", i);
      printf ("ai = %lX\n", ai);
      return 0;
    }
}
int main (void)
{
  f (1);
  return 0;
}

[Bug c/64255] [5 Regression] failures with -O2 optimization on i >= 0 ? (unsigned long) i : - (unsigned long) i

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64255

--- Comment #6 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
A better version:

void __attribute__ ((noinline, noclone))
bar (long int i)
{
  asm ("");
}

int __attribute__ ((noinline, noclone))
f (long i)
{
  if (i == 0)
    return 0;
  else
    {
      unsigned long ai = i >= 0 ? (unsigned long) i : -(unsigned long) i;
      if ((i >= 0 ? (unsigned long) i : -(unsigned long) i) != ai)
        bar (0);
      bar (i);
      return ai;
    }
}

int
main (void)
{
  if (f (1) != 1)
    __builtin_abort ();
}

[Bug c/64255] [5 Regression] failures with -O2 optimization on i >= 0 ? (unsigned long) i : - (unsigned long) i

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64255

--- Comment #7 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
-fno-if-conversion seems to help.

[Bug c/64255] [5 Regression] failures with -O2 optimization on i >= 0 ? (unsigned long) i : - (unsigned long) i

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64255

--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I had:
__attribute__((noinline, noclone))
void
bar (long i, unsigned long j)
{
  if (i != 1 || j != 1)
    __builtin_abort ();
}

__attribute__((noinline, noclone))
void
foo (long i)
{
  unsigned long j;

  if (!i)
    return;
  j = i >= 0 ? (unsigned long) i : - (unsigned long) i;
  if ((i >= 0 ? (unsigned long) i : - (unsigned long) i) != j)
    __builtin_abort ();
  bar (i, j);
}

int
main ()
{
  foo (1);
  return 0;
}

In any case, regressed with r217646, works with -O0/-O1, or -O2 -m32, fails
with -O2 (on x86_64-linux).

[Bug rtl-optimization/64255] [5 Regression] failures with -O2 optimization on i >= 0 ? (unsigned long) i : - (unsigned long) i

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64255

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|c                           |rtl-optimization

--- Comment #9 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Marek Polacek from comment #7)
> -fno-if-conversion seems to help.

Then this is most likely a Dup of another bug which has a few version of a
patch posted now.

[Bug rtl-optimization/64255] [5 Regression] failures with -O2 optimization on i >= 0 ? (unsigned long) i : - (unsigned long) i

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64255

--- Comment #10 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #9)
> (In reply to Marek Polacek from comment #7)
> > -fno-if-conversion seems to help.
> 
> Then this is most likely a Dup of another bug which has a few version of a
> patch posted now.

PR63917?

[Bug rtl-optimization/64255] [5 Regression] failures with -O2 optimization on i >= 0 ? (unsigned long) i : - (unsigned long) i

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64255

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Depends on|                            |63917

--- Comment #11 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Markus Trippelsdorf from comment #10)
> > Then this is most likely a Dup of another bug which has a few version of a
> > patch posted now.
> 
> PR63917?
yes.

[Bug rtl-optimization/64255] [5 Regression] failures with -O2 optimization on i >= 0 ? (unsigned long) i : - (unsigned long) i

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64255

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P1

[Bug rtl-optimization/64255] [5 Regression] failures with -O2 optimization on i >= 0 ? (unsigned long) i : - (unsigned long) i

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64255

Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #12 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Fixed by r218658.

[Bug rtl-optimization/64255] [5 Regression] failures with -O2 optimization on i >= 0 ? (unsigned long) i : - (unsigned long) i

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64255
Bug 64255 depends on bug 63917, which changed state.

Bug 63917 Summary: [5 Regression] r217646 caused many failures
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63917

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

[Bug rtl-optimization/64255] [5 Regression] failures with -O2 optimization on i >= 0 ? (unsigned long) i : - (unsigned long) i

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64255

--- Comment #13 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Fri Dec 12 12:43:34 2014
New Revision: 218665

URL: https://gcc.gnu.org/viewcvs?rev=218665&root=gcc&view=rev
Log:
    PR rtl-optimization/64255
    * gcc.c-torture/execute/pr64255.c: New test.

    PR rtl-optimization/64260
    * gcc.c-torture/execute/pr64260.c: New test.

Added:
    trunk/gcc/testsuite/gcc.c-torture/execute/pr64255.c
    trunk/gcc/testsuite/gcc.c-torture/execute/pr64260.c
Modified:
    trunk/gcc/testsuite/ChangeLog