[Bug rtl-optimization/100554] New: [9/10/11/12 Regression] -fcompare-debug failure w/ -Os -fmodulo-sched -fno-tree-loop-optimize

[Bug rtl-optimization/100554] New: [9/10/11/12 Regression] -fcompare-debug failure w/ -Os -fmodulo-sched -fno-tree-loop-optimize

[asolokha at gmx dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100554

            Bug ID: 100554
           Summary: [9/10/11/12 Regression] -fcompare-debug failure w/ -Os
                    -fmodulo-sched -fno-tree-loop-optimize
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: asolokha at gmx dot com
  Target Milestone: ---
            Target: aarch64-linux-gnu

gcc-12.0.0-alpha20210509 snapshot (g:5e0236d3b0e0d7ad98bcee36128433fa755b5558),
11.1, 10.3, 9.3 fail -fcompare-debug when compiling the following testcase w/
-Os -fmodulo-sched -fno-tree-loop-optimize:

int __attribute__ ((simd))
foo (int x)
{
  return x;
}

% aarch64-linux-gnu-gcc-12.0.0 -Os -fcompare-debug -fmodulo-sched
-fno-tree-loop-optimize -c cn8zanql.c
aarch64-linux-gnu-gcc-12.0.0: error: cn8zanql.c: '-fcompare-debug' failure

--- cn8zanql.c.gkd      2021-05-12 10:02:59.380096724 +0700
+++ cn8zanql.gk.c.gkd   2021-05-12 10:02:59.414096616 +0700
@@ -669,6 +669,7 @@
      (nil))
 (code_label # 0 0 13 (nil) [1 uses])
 (note # 0 0 [bb 3] NOTE_INSN_BASIC_BLOCK)
+(note # 0 0 NOTE_INSN_DELETED)
 (insn # 0 0 (set (reg:DI 3 x3)
         (zero_extend:DI (mem:SI (plus:DI (reg/f:DI 5 x5 [103])
                     (reg:DI 1 x1 [99])) [ D.xxxx[iter.14_3]+0 S4 A32])))
"cn8zanql.c":4:10# {*zero_extendsidi2_aarch64}
@@ -679,7 +680,6 @@
      (expr_list:REG_DEAD (reg:SI 3 x3 [orig:104 D.xxxx[iter.14_3] ] [104])
         (expr_list:REG_DEAD (reg:DI 1 x1 [99])
             (nil))))
-(note # 0 0 NOTE_INSN_DELETED)
 (insn # 0 0 (set (reg:DI 1 x1 [99])
         (and:DI (ashift:DI (reg:DI 0 x0 [orig:93 D.xxxx ] [93])
                 (const_int 2 [0x2]))

Is it an issue at all? Should I report more issues of this kind in the future?

[Bug rtl-optimization/100554] [9/10/11/12 Regression] -fcompare-debug failure w/ -Os -fmodulo-sched -fno-tree-loop-optimize

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100554

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |9.4

[Bug rtl-optimization/100554] [9/10/11/12 Regression] -fcompare-debug failure w/ -Os -fmodulo-sched -fno-tree-loop-optimize

[zhroma at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100554

Roman Zhuykov <zhroma at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           See Also|                            |https://gcc.gnu.org/bugzill
                   |                            |a/show_bug.cgi?id=100533,
                   |                            |https://gcc.gnu.org/bugzill
                   |                            |a/show_bug.cgi?id=100523
                 CC|                            |abel at ispras dot ru,
                   |                            |jakub at redhat dot com,
                   |                            |zhroma at gcc dot gnu.org

--- Comment #1 from Roman Zhuykov <zhroma at gcc dot gnu.org> ---
> Is it an issue at all?
> Should I report more issues of this kind in the future?
I think the answer is "yes" for both questions, thanks for your reports!

A year ago when I bothered about regtesting with -fcompare-debug I've created a
few issues unrelated to modulo scheduler and Jakub fixed most of them. Short
summary is available at
https://gcc.gnu.org/pipermail/gcc-patches/2020-March/542389.html, there I've
also investigated everything on modulo sched side, but small patch2.txt was
never committed.

Given now we are in stage1 and have three PRs (I'll check PR100533 and
PR100523, they should be same), now it's time to push that.

[Bug rtl-optimization/100554] [9/10/11/12 Regression] -fcompare-debug failure w/ -Os -fmodulo-sched -fno-tree-loop-optimize

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100554

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|9.4                         |9.5

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
GCC 9.4 is being released, retargeting bugs to GCC 9.5.

[Bug rtl-optimization/100554] [9/10/11/12 Regression] -fcompare-debug failure w/ -Os -fmodulo-sched -fno-tree-loop-optimize

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100554

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
           Priority|P3                          |P2
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2022-01-17

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed on trunk.

[Bug rtl-optimization/100554] [10/11/12/13 Regression] -fcompare-debug failure w/ -Os -fmodulo-sched -fno-tree-loop-optimize

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100554

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|9.5                         |10.4

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
GCC 9 branch is being closed

[Bug rtl-optimization/100554] [10/11/12/13 Regression] -fcompare-debug failure w/ -Os -fmodulo-sched -fno-tree-loop-optimize

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100554

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|10.4                        |10.5

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 10.4 is being released, retargeting bugs to GCC 10.5.

[Bug rtl-optimization/100554] [11/12/13/14 Regression] -fcompare-debug failure w/ -Os -fmodulo-sched -fno-tree-loop-optimize

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100554

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|10.5                        |11.5

--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
GCC 10 branch is being closed.

[Bug rtl-optimization/100554] [11/12/13/14 Regression] -fcompare-debug failure w/ -Os -fmodulo-sched -fno-tree-loop-optimize

[law at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100554

Jeffrey A. Law <law at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |law at gcc dot gnu.org
           Priority|P2                          |P4