[Bug rtl-optimization/113390] New: [14 Regression] ICE: in model_update_limit_points_in_group, at haifa-sched.cc:1986 with -O2 --param=max-sched-region-insns=200 --param=max-sched-extend-regions-iters=2

[Bug rtl-optimization/113390] New: [14 Regression] ICE: in model_update_limit_points_in_group, at haifa-sched.cc:1986 with -O2 --param=max-sched-region-insns=200 --param=max-sched-extend-regions-iters=2

[zsojka at seznam dot cz]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113390

            Bug ID: 113390
           Summary: [14 Regression] ICE: in
                    model_update_limit_points_in_group, at
                    haifa-sched.cc:1986 with -O2
                    --param=max-sched-region-insns=200
                    --param=max-sched-extend-regions-iters=2
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zsojka at seznam dot cz
  Target Milestone: ---
              Host: x86_64-pc-linux-gnu
            Target: riscv64-unknown-linux-gnu

Created attachment 57079
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=57079&action=edit
reduced testcase

Compiler output:
$ riscv64-unknown-linux-gnu-gcc -O2 --param=max-sched-region-insns=200
--param=max-sched-extend-regions-iters=2 testcase.c 
during RTL pass: sched1
testcase.c: In function 'foo0':
testcase.c:45:1: internal compiler error: in
model_update_limit_points_in_group, at haifa-sched.cc:1986
   45 | }
      | ^
0xe95736 model_update_limit_points_in_group
        /repo/gcc-trunk/gcc/haifa-sched.cc:1986
0xe95736 model_update_limit_points
        /repo/gcc-trunk/gcc/haifa-sched.cc:1997
0xe95736 schedule_insn
        /repo/gcc-trunk/gcc/haifa-sched.cc:4091
0x2a40c39 schedule_block(basic_block_def**, void*)
        /repo/gcc-trunk/gcc/haifa-sched.cc:6915
0x1650ec4 schedule_region
        /repo/gcc-trunk/gcc/sched-rgn.cc:3203
0x1650ec4 schedule_insns()
        /repo/gcc-trunk/gcc/sched-rgn.cc:3525
0x165130c schedule_insns()
        /repo/gcc-trunk/gcc/sched-rgn.cc:3511
0x165130c rest_of_handle_sched
        /repo/gcc-trunk/gcc/sched-rgn.cc:3729
0x165130c execute
        /repo/gcc-trunk/gcc/sched-rgn.cc:3839
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.

$ riscv64-unknown-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest-riscv64/bin/riscv64-unknown-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-r14-7215-20240112190107-g8b447fa89d5-checking-yes-rtl-df-extra-riscv64/bin/../libexec/gcc/riscv64-unknown-linux-gnu/14.0.1/lto-wrapper
Target: riscv64-unknown-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--with-cloog --with-ppl --with-isl --with-isa-spec=2.2
--with-sysroot=/usr/riscv64-unknown-linux-gnu --build=x86_64-pc-linux-gnu
--host=x86_64-pc-linux-gnu --target=riscv64-unknown-linux-gnu
--with-ld=/usr/bin/riscv64-unknown-linux-gnu-ld
--with-as=/usr/bin/riscv64-unknown-linux-gnu-as --disable-multilib
--disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-r14-7215-20240112190107-g8b447fa89d5-checking-yes-rtl-df-extra-riscv64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 14.0.1 20240112 (experimental) (GCC)

[Bug rtl-optimization/113390] [14 Regression] ICE: in model_update_limit_points_in_group, at haifa-sched.cc:1986 with -O2 --param=max-sched-region-insns=200 --param=max-sched-extend-regions-iters=2

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113390

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |needs-bisection
   Target Milestone|---                         |14.0

[Bug rtl-optimization/113390] [14 Regression] ICE: in model_update_limit_points_in_group, at haifa-sched.cc:1986 with -O2 --param=max-sched-region-insns=200 --param=max-sched-extend-regions-iters=2

[mjires at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113390

Michal Jireš <mjires at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|needs-bisection             |
                 CC|                            |mjires at gcc dot gnu.org,
                   |                            |pinskia at gcc dot gnu.org

--- Comment #1 from Michal Jireš <mjires at gcc dot gnu.org> ---
Bisected to r14-7114-g113475d03b0ab1.

[Bug rtl-optimization/113390] [14 Regression] ICE: in model_update_limit_points_in_group, at haifa-sched.cc:1986 with -O2 --param=max-sched-region-insns=200 --param=max-sched-extend-regions-iters=2

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113390

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2024-02-08

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Michal Jireš from comment #1)
> Bisected to r14-7114-g113475d03b0ab1.

Funny, guess a latent bug.

[Bug rtl-optimization/113390] [14 Regression] ICE: in model_update_limit_points_in_group, at haifa-sched.cc:1986 with -O2 --param=max-sched-region-insns=200 --param=max-sched-extend-regions-iters=2

[law at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113390

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

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

[Bug rtl-optimization/113390] [14 Regression] ICE: in model_update_limit_points_in_group, at haifa-sched.cc:1986 with -O2 --param=max-sched-region-insns=200 --param=max-sched-extend-regions-iters=2

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113390

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Not sure why this is P1 when riscv*-*-* is neither primary nor secondary
target.
Of course, question is if that shouldn't change.

[Bug rtl-optimization/113390] [14 Regression] ICE: in model_update_limit_points_in_group, at haifa-sched.cc:1986 with -O2 --param=max-sched-region-insns=200 --param=max-sched-extend-regions-iters=2

[law at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113390

--- Comment #4 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Made it a P1 simply because it was likely not RISC-V specific ICE.  I don't
think we're at a point where it makes sense for RISC-V to be a primary
platform, though hopefully that'll change in the relatively near future.

[Bug rtl-optimization/113390] [14 Regression] ICE: in model_update_limit_points_in_group, at haifa-sched.cc:1986 with -O2 --param=max-sched-region-insns=200 --param=max-sched-extend-regions-iters=2

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113390

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rsandifo at gcc dot gnu.org
           Priority|P1                          |P2

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
P2, mostly because it's an uncovered latent issue and because it needs two
--param specifiers and plus we didn't hit this in real-world code.

Now, Richard Sandiford wrote the function we ICE in, so he might know what's
going on here.

[Bug rtl-optimization/113390] [14/15 Regression] ICE: in model_update_limit_points_in_group, at haifa-sched.cc:1986 with -O2 --param=max-sched-region-insns=200 --param=max-sched-extend-regions-iters=2

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113390

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|14.0                        |14.2

--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
GCC 14.1 is being released, retargeting bugs to GCC 14.2.