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* [Bug tree-optimization/100566] New: [11/12 Regression] Miscompilation of mausezahn since r11-2446
@ 2021-05-12 12:27 jakub at gcc dot gnu.org
  2021-05-12 12:27 ` [Bug tree-optimization/100566] " jakub at gcc dot gnu.org
                   ` (10 more replies)
  0 siblings, 11 replies; 12+ messages in thread
From: jakub at gcc dot gnu.org @ 2021-05-12 12:27 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100566

            Bug ID: 100566
           Summary: [11/12 Regression] Miscompilation of mausezahn since
                    r11-2446
           Product: gcc
           Version: 11.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jakub at gcc dot gnu.org
  Target Milestone: ---

The following testcase is miscompiled at -O2 since
r11-2446-g3e61a2056335ca7d4e2009823efae4ee2dc950ee
- it loops endlessly instead of terminating.

struct S { unsigned int s1, s2; int s3, s4, s5, s6, s7; unsigned int s8; };
struct S s;
enum E { E1, E2, E3, E4, E5, E6, E7, E8, E9, E10, E11, E12, E13, E14, E15 };
enum E e;
int f, g, h;

__attribute__((noipa)) void fn1 (void *l)
{
  asm volatile ("" : : "r" (l) : "memory");
}

__attribute__((noipa)) int fn2 (void *l)
{
  asm volatile ("" : : "r" (l) : "memory");
  return 0;
}

__attribute__((noipa)) int fn3 (void)
{
  asm volatile ("" : : : "memory");
  return 0;
}

__attribute__((nothrow, leaf, noipa)) int fn4 (void)
{
  asm volatile ("" : : : "memory");
  return 0;
}

__attribute__((noipa)) int fn5 (unsigned int l)
{
  asm volatile ("" : : "r" (l) : "memory");
  return 0;
}

__attribute__((noipa)) int fn6 (void *l, int t)
{
  asm volatile ("" : : "r" (l), "r" (t) : "memory");
  return 0;
}

__attribute__((noipa)) int fn7 (void *l, int t)
{
  asm volatile ("" : : "r" (l), "r" (t) : "memory");
  return 0;
}

__attribute__((noipa)) int fn8 (void *l, int t)
{
  asm volatile ("" : : "r" (l), "r" (t) : "memory");
  return 0;
}

__attribute__((noipa)) int fn9 (void *l, int t)
{
  asm volatile ("" : : "r" (l), "r" (t) : "memory");
  return 0;
}

__attribute__((noipa)) int fn10 (void *l, int t)
{
  asm volatile ("" : : "r" (l), "r" (t) : "memory");
  return 0;
}

__attribute__((noipa)) int fn11 (void *l, int t)
{
  asm volatile ("" : : "r" (l), "r" (t) : "memory");
  return 0;
}

__attribute__((noipa)) int fn12 (void *l, int t)
{
  asm volatile ("" : : "r" (l), "r" (t) : "memory");
  return 0;
}

__attribute__((noipa)) int fn13 (void *l, int t)
{
  asm volatile ("" : : "r" (l), "r" (t) : "memory");
  return 0;
}

__attribute__((noipa)) int fn14 (void *l, int t)
{
  asm volatile ("" : : "r" (l), "r" (t) : "memory");
  return 0;
}

__attribute__((noipa))
int test (void *l, int y, int z)
{
  int i = 0, s1;
  int s8, s7, s6, s5, s4, j = 0;
  s1 = s.s1;
  s8 = s.s8;
  s7 = s.s7;
  s6 = s.s6;
  s5 = s.s5;
  s4 = s.s4 | s.s3;
  if (e == E11)
    j = 1;
  if (s1 == 0)
    goto lab;
  for (i = 0; i < s1; i++)
    {
    lab:
      if (f)
        {
          switch (e)
            {
            case E6:
              fn12 (l, z);
              break;
            case E7:
            case E9:
            case E11:
            case E13:
              fn13 (l, z);
              break;
            case E8:
              fn14 (l, z);
              break;
            }
        }
      if (g)
        fn3 ();
      fn2 (l);
      if (h)
        s.s2 = (unsigned int) s.s2 * fn4 () / 2147483647;
      if (s.s2)
        fn5 (s.s2);
      if (s8)
        {
          if (fn11 (l, z) == 0)
            goto lab;
        }
      if (s7)
        {
          if (fn9 (l, z) == 0)
            goto lab;
        }
      if (s6)
        {
          if (fn10 (l, z) == 0)
            goto lab;
        }
      if (s5)
        {
          if (fn8 (l, y) == 0)
            goto lab;
        }
      if (s4)
        {
          if (fn7 (l, y) == 0)
            goto lab;
        }
      if (j)
        fn6 (l, z);
      if (!s1)
        goto lab;
    }
  fn1 (l);
  return 0;
}

int
main ()
{
  asm volatile ("" : : "g" (&s), "g" (&e), "g" (&f), "g" (&g), "g" (&h) :
"memory");
  s.s1 = 1;
  e = E7;
  test (0, 2, 1);
  return 0;
}

^ permalink raw reply	[flat|nested] 12+ messages in thread
* [Bug tree-optimization/100566] [11/12 Regression] Miscompilation of mausezahn since r11-2446
  2021-05-12 12:27 [Bug tree-optimization/100566] New: [11/12 Regression] Miscompilation of mausezahn since r11-2446 jakub at gcc dot gnu.org
@ 2021-05-12 12:27 ` jakub at gcc dot gnu.org
  2021-05-12 12:47 ` jakub at gcc dot gnu.org
                   ` (9 subsequent siblings)
  10 siblings, 0 replies; 12+ messages in thread
From: jakub at gcc dot gnu.org @ 2021-05-12 12:27 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100566

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |wrong-code
                 CC|                            |rguenth at gcc dot gnu.org
   Last reconfirmed|                            |2021-05-12
           Priority|P3                          |P2
             Status|UNCONFIRMED                 |NEW
   Target Milestone|---                         |11.2
     Ever confirmed|0                           |1

^ permalink raw reply	[flat|nested] 12+ messages in thread
* [Bug tree-optimization/100566] [11/12 Regression] Miscompilation of mausezahn since r11-2446
  2021-05-12 12:27 [Bug tree-optimization/100566] New: [11/12 Regression] Miscompilation of mausezahn since r11-2446 jakub at gcc dot gnu.org
  2021-05-12 12:27 ` [Bug tree-optimization/100566] " jakub at gcc dot gnu.org
@ 2021-05-12 12:47 ` jakub at gcc dot gnu.org
  2021-05-12 12:48 ` [Bug tree-optimization/100566] [11/12 Regression] Miscompilation of mausezahn since r9-2635 jakub at gcc dot gnu.org
                   ` (8 subsequent siblings)
  10 siblings, 0 replies; 12+ messages in thread
From: jakub at gcc dot gnu.org @ 2021-05-12 12:47 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100566

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Though, on more reduced testcase from that it started already in
r9-2635-g78ea9abc2018243af7f7ada6135144ac90c6ad27
(likewise at -O2):
volatile int s, c;

__attribute__((noipa)) void
foo (void)
{
  if (c++ > 1)
    __builtin_abort ();
}

__attribute__((noipa)) int
bar (void)
{
  int i = 0, j = s;
  if (j == 0)
    goto lab;
  for (i = 0; i < j; i++)
    {
    lab:
      foo ();
      if (!j)
        goto lab;
    }
  return 0;
}

int
main ()
{
  s = 1;
  bar ();
  if (c != 1)
    __builtin_abort ();
  return 0;
}

^ permalink raw reply	[flat|nested] 12+ messages in thread
* [Bug tree-optimization/100566] [11/12 Regression] Miscompilation of mausezahn since r9-2635
  2021-05-12 12:27 [Bug tree-optimization/100566] New: [11/12 Regression] Miscompilation of mausezahn since r11-2446 jakub at gcc dot gnu.org
  2021-05-12 12:27 ` [Bug tree-optimization/100566] " jakub at gcc dot gnu.org
  2021-05-12 12:47 ` jakub at gcc dot gnu.org
@ 2021-05-12 12:48 ` jakub at gcc dot gnu.org
  2021-05-12 12:54 ` [Bug tree-optimization/100566] [9/10/11/12 " rguenth at gcc dot gnu.org
                   ` (7 subsequent siblings)
  10 siblings, 0 replies; 12+ messages in thread
From: jakub at gcc dot gnu.org @ 2021-05-12 12:48 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100566

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|11.2                        |9.4
            Summary|[11/12 Regression]          |[11/12 Regression]
                   |Miscompilation of mausezahn |Miscompilation of mausezahn
                   |since r11-2446              |since r9-2635

^ permalink raw reply	[flat|nested] 12+ messages in thread
* [Bug tree-optimization/100566] [9/10/11/12 Regression] Miscompilation of mausezahn since r9-2635
  2021-05-12 12:27 [Bug tree-optimization/100566] New: [11/12 Regression] Miscompilation of mausezahn since r11-2446 jakub at gcc dot gnu.org
                   ` (2 preceding siblings ...)
  2021-05-12 12:48 ` [Bug tree-optimization/100566] [11/12 Regression] Miscompilation of mausezahn since r9-2635 jakub at gcc dot gnu.org
@ 2021-05-12 12:54 ` rguenth at gcc dot gnu.org
  2021-05-12 12:59 ` jakub at gcc dot gnu.org
                   ` (6 subsequent siblings)
  10 siblings, 0 replies; 12+ messages in thread
From: rguenth at gcc dot gnu.org @ 2021-05-12 12:54 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100566

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|unassigned at gcc dot gnu.org      |rguenth at gcc dot gnu.org
             Status|NEW                         |ASSIGNED

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Mine.

^ permalink raw reply	[flat|nested] 12+ messages in thread
* [Bug tree-optimization/100566] [9/10/11/12 Regression] Miscompilation of mausezahn since r9-2635
  2021-05-12 12:27 [Bug tree-optimization/100566] New: [11/12 Regression] Miscompilation of mausezahn since r11-2446 jakub at gcc dot gnu.org
                   ` (3 preceding siblings ...)
  2021-05-12 12:54 ` [Bug tree-optimization/100566] [9/10/11/12 " rguenth at gcc dot gnu.org
@ 2021-05-12 12:59 ` jakub at gcc dot gnu.org
  2021-05-12 13:43 ` rguenth at gcc dot gnu.org
                   ` (5 subsequent siblings)
  10 siblings, 0 replies; 12+ messages in thread
From: jakub at gcc dot gnu.org @ 2021-05-12 12:59 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100566

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The r9-2635 change miscompiles it during PRE,
  <bb 2> [local count: 347387062]:
  j_7 ={v} s;
  if (j_7 == 0)
    goto <bb 3>; [34.00%]
  else
    goto <bb 6>; [66.00%]

  <bb 3> [local count: 291805133]:
  # i_8 = PHI <0(2), i_2(6)>

  <bb 4> [local count: 1073741825]:
  foo ();
  if (j_7 == 0)
    goto <bb 8>; [89.00%]
  else
    goto <bb 5>; [11.00%]

  <bb 8> [local count: 955630225]:
  goto <bb 4>; [100.00%]

  <bb 5> [local count: 118111601]:
  i_10 = i_8 + 1;

  <bb 6> [local count: 347387062]:
  # i_2 = PHI <i_10(5), 0(2)>
  if (i_2 < j_7)
    goto <bb 3>; [50.00%]
  else
    goto <bb 7>; [50.00%]

  <bb 7> [local count: 173693531]:
  return 0;
looks ok, but PRE assumes the second j_7 == 0 is always true and thus turns the
foo () call into a tight endless loop:
  <bb 4> [local count: 1073741825]:
  foo ();
  goto <bb 4>; [100.00%]
That is the intention of the testcase when s == 0, but not otherwise.

^ permalink raw reply	[flat|nested] 12+ messages in thread
* [Bug tree-optimization/100566] [9/10/11/12 Regression] Miscompilation of mausezahn since r9-2635
  2021-05-12 12:27 [Bug tree-optimization/100566] New: [11/12 Regression] Miscompilation of mausezahn since r11-2446 jakub at gcc dot gnu.org
                   ` (4 preceding siblings ...)
  2021-05-12 12:59 ` jakub at gcc dot gnu.org
@ 2021-05-12 13:43 ` rguenth at gcc dot gnu.org
  2021-05-12 15:01 ` cvs-commit at gcc dot gnu.org
                   ` (4 subsequent siblings)
  10 siblings, 0 replies; 12+ messages in thread
From: rguenth at gcc dot gnu.org @ 2021-05-12 13:43 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100566

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 50801
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=50801&action=edit
patch

OK, so the issue is that predication is still bogus (similar to the other PR)
and we're treating a non-executable backedge optimistically here.

testing the attached

^ permalink raw reply	[flat|nested] 12+ messages in thread
* [Bug tree-optimization/100566] [9/10/11/12 Regression] Miscompilation of mausezahn since r9-2635
  2021-05-12 12:27 [Bug tree-optimization/100566] New: [11/12 Regression] Miscompilation of mausezahn since r11-2446 jakub at gcc dot gnu.org
                   ` (5 preceding siblings ...)
  2021-05-12 13:43 ` rguenth at gcc dot gnu.org
@ 2021-05-12 15:01 ` cvs-commit at gcc dot gnu.org
  2021-05-12 15:58 ` cvs-commit at gcc dot gnu.org
                   ` (3 subsequent siblings)
  10 siblings, 0 replies; 12+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2021-05-12 15:01 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100566

--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Biener <rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:097fde5e7514e909f2e8472be2e008d0cab2260d

commit r12-750-g097fde5e7514e909f2e8472be2e008d0cab2260d
Author: Richard Biener <rguenther@suse.de>
Date:   Wed May 12 15:39:52 2021 +0200

    tree-optimization/100566 - fix another predication issue in VN

    This amends the fix for PR100053 where I failed to amend all edge
    tests in dominated_by_p_w_unex.

    2021-05-12  Richard Biener  <rguenther@suse.de>

            PR tree-optimization/100566
            * tree-ssa-sccvn.c (dominated_by_p_w_unex): Properly handle
            allow_back for all edge queries.

            * gcc.dg/torture/pr100566.c: New testcase.

^ permalink raw reply	[flat|nested] 12+ messages in thread
* [Bug tree-optimization/100566] [9/10/11/12 Regression] Miscompilation of mausezahn since r9-2635
  2021-05-12 12:27 [Bug tree-optimization/100566] New: [11/12 Regression] Miscompilation of mausezahn since r11-2446 jakub at gcc dot gnu.org
                   ` (6 preceding siblings ...)
  2021-05-12 15:01 ` cvs-commit at gcc dot gnu.org
@ 2021-05-12 15:58 ` cvs-commit at gcc dot gnu.org
  2021-05-17  7:47 ` [Bug tree-optimization/100566] [9/10 " cvs-commit at gcc dot gnu.org
                   ` (2 subsequent siblings)
  10 siblings, 0 replies; 12+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2021-05-12 15:58 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100566

--- Comment #6 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-11 branch has been updated by Richard Biener
<rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:ce3c70e9ed265578be896b8f7711851b0a7273f1

commit r11-8405-gce3c70e9ed265578be896b8f7711851b0a7273f1
Author: Richard Biener <rguenther@suse.de>
Date:   Wed May 12 15:39:52 2021 +0200

    tree-optimization/100566 - fix another predication issue in VN

    This amends the fix for PR100053 where I failed to amend all edge
    tests in dominated_by_p_w_unex.

    2021-05-12  Richard Biener  <rguenther@suse.de>

            PR tree-optimization/100566
            * tree-ssa-sccvn.c (dominated_by_p_w_unex): Properly handle
            allow_back for all edge queries.

            * gcc.dg/torture/pr100566.c: New testcase.

    (cherry picked from commit 097fde5e7514e909f2e8472be2e008d0cab2260d)

^ permalink raw reply	[flat|nested] 12+ messages in thread
* [Bug tree-optimization/100566] [9/10 Regression] Miscompilation of mausezahn since r9-2635
  2021-05-12 12:27 [Bug tree-optimization/100566] New: [11/12 Regression] Miscompilation of mausezahn since r11-2446 jakub at gcc dot gnu.org
                   ` (7 preceding siblings ...)
  2021-05-12 15:58 ` cvs-commit at gcc dot gnu.org
@ 2021-05-17  7:47 ` cvs-commit at gcc dot gnu.org
  2021-05-17  8:17 ` cvs-commit at gcc dot gnu.org
  2021-05-17  8:18 ` rguenth at gcc dot gnu.org
  10 siblings, 0 replies; 12+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2021-05-17  7:47 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100566

--- Comment #7 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-10 branch has been updated by Richard Biener
<rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:9ddc622a15d05510e7ab17ca1584d7fdb828d64e

commit r10-9828-g9ddc622a15d05510e7ab17ca1584d7fdb828d64e
Author: Richard Biener <rguenther@suse.de>
Date:   Wed May 12 15:39:52 2021 +0200

    tree-optimization/100566 - fix another predication issue in VN

    This amends the fix for PR100053 where I failed to amend all edge
    tests in dominated_by_p_w_unex.

    2021-05-12  Richard Biener  <rguenther@suse.de>

            PR tree-optimization/100566
            * tree-ssa-sccvn.c (dominated_by_p_w_unex): Properly handle
            allow_back for all edge queries.

            * gcc.dg/torture/pr100566.c: New testcase.

    (cherry picked from commit 097fde5e7514e909f2e8472be2e008d0cab2260d)

^ permalink raw reply	[flat|nested] 12+ messages in thread
* [Bug tree-optimization/100566] [9/10 Regression] Miscompilation of mausezahn since r9-2635
  2021-05-12 12:27 [Bug tree-optimization/100566] New: [11/12 Regression] Miscompilation of mausezahn since r11-2446 jakub at gcc dot gnu.org
                   ` (8 preceding siblings ...)
  2021-05-17  7:47 ` [Bug tree-optimization/100566] [9/10 " cvs-commit at gcc dot gnu.org
@ 2021-05-17  8:17 ` cvs-commit at gcc dot gnu.org
  2021-05-17  8:18 ` rguenth at gcc dot gnu.org
  10 siblings, 0 replies; 12+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2021-05-17  8:17 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100566

--- Comment #8 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-9 branch has been updated by Richard Biener
<rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:c8938332efa5ca5926b6f349e13b251e52bc2383

commit r9-9535-gc8938332efa5ca5926b6f349e13b251e52bc2383
Author: Richard Biener <rguenther@suse.de>
Date:   Wed May 12 15:39:52 2021 +0200

    tree-optimization/100566 - fix another predication issue in VN

    This amends the fix for PR100053 where I failed to amend all edge
    tests in dominated_by_p_w_unex.

    2021-05-12  Richard Biener  <rguenther@suse.de>

            PR tree-optimization/100566
            * tree-ssa-sccvn.c (dominated_by_p_w_unex): Properly handle
            allow_back for all edge queries.

            * gcc.dg/torture/pr100566.c: New testcase.

    (cherry picked from commit 097fde5e7514e909f2e8472be2e008d0cab2260d)

^ permalink raw reply	[flat|nested] 12+ messages in thread
* [Bug tree-optimization/100566] [9/10 Regression] Miscompilation of mausezahn since r9-2635
  2021-05-12 12:27 [Bug tree-optimization/100566] New: [11/12 Regression] Miscompilation of mausezahn since r11-2446 jakub at gcc dot gnu.org
                   ` (9 preceding siblings ...)
  2021-05-17  8:17 ` cvs-commit at gcc dot gnu.org
@ 2021-05-17  8:18 ` rguenth at gcc dot gnu.org
  10 siblings, 0 replies; 12+ messages in thread
From: rguenth at gcc dot gnu.org @ 2021-05-17  8:18 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100566

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to fail|                            |10.3.0, 9.3.0
      Known to work|                            |10.3.1, 9.3.1
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed.

^ permalink raw reply	[flat|nested] 12+ messages in thread
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