[Bug target/112686] New: [14 Regression] ICE: in gen_reg_rtx, at emit-rtl.cc:1176 with -fsplit-stack -mcmodel=large

[Bug target/112686] New: [14 Regression] ICE: in gen_reg_rtx, at emit-rtl.cc:1176 with -fsplit-stack -mcmodel=large

[zsojka at seznam dot cz]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112686

            Bug ID: 112686
           Summary: [14 Regression] ICE: in gen_reg_rtx, at
                    emit-rtl.cc:1176 with -fsplit-stack -mcmodel=large
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zsojka at seznam dot cz
  Target Milestone: ---
              Host: x86_64-pc-linux-gnu
            Target: x86_64-pc-linux-gnu

Created attachment 56677
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=56677&action=edit
reduced testcase

Compiler output:
$ x86_64-pc-linux-gnu-gcc -fsplit-stack -mcmodel=large testcase.c 
during RTL pass: pro_and_epilogue
testcase.c: In function 'foo':
testcase.c:1:17: internal compiler error: in gen_reg_rtx, at emit-rtl.cc:1176
    1 | void foo(void) {}
      |                 ^
0x74c298 gen_reg_rtx(machine_mode)
        /repo/gcc-trunk/gcc/emit-rtl.cc:1176
0x107cfae copy_to_mode_reg(machine_mode, rtx_def*)
        /repo/gcc-trunk/gcc/explow.cc:650
0x19b175d ix86_expand_call(rtx_def*, rtx_def*, rtx_def*, rtx_def*, rtx_def*,
bool)
        /repo/gcc-trunk/gcc/config/i386/i386-expand.cc:9710
0x18b70da ix86_expand_split_stack_prologue()
        /repo/gcc-trunk/gcc/config/i386/i386.cc:10565
0x1dec81a gen_split_stack_prologue()
        /repo/gcc-trunk/gcc/config/i386/i386.md:18458
0x1897c75 target_gen_split_stack_prologue
        /repo/gcc-trunk/gcc/config/i386/i386.md:18213
0x111a64a make_split_prologue_seq
        /repo/gcc-trunk/gcc/function.cc:5795
0x111a64a make_split_prologue_seq
        /repo/gcc-trunk/gcc/function.cc:5788
0x111a83a thread_prologue_and_epilogue_insns()
        /repo/gcc-trunk/gcc/function.cc:6049
0x111b1b2 rest_of_handle_thread_prologue_and_epilogue
        /repo/gcc-trunk/gcc/function.cc:6553
0x111b1b2 execute
        /repo/gcc-trunk/gcc/function.cc:6634
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.

$ x86_64-pc-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest-amd64/bin/x86_64-pc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-r14-5791-20231123115417-g24592abd68e-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/14.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--disable-bootstrap --with-cloog --with-ppl --with-isl
--build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu
--target=x86_64-pc-linux-gnu --with-ld=/usr/bin/x86_64-pc-linux-gnu-ld
--with-as=/usr/bin/x86_64-pc-linux-gnu-as --disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-r14-5791-20231123115417-g24592abd68e-checking-yes-rtl-df-extra-nobootstrap-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 14.0.0 20231123 (experimental) (GCC)

[Bug target/112686] [14 Regression] ICE: in gen_reg_rtx, at emit-rtl.cc:1176 with -fsplit-stack -mcmodel=large

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112686

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
           See Also|                            |https://gcc.gnu.org/bugzill
                   |                            |a/show_bug.cgi?id=89316
   Last reconfirmed|                            |2023-11-23
   Target Milestone|---                         |14.0

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Most likely introduced by r14-5784-g2f3f8952ff1736 .

It is a bit upsetting the testcase from PR 46089 is the same testcase here was
not added back when PR 46089 was fixed in 4.6.

[Bug target/112686] [14 Regression] ICE: in gen_reg_rtx, at emit-rtl.cc:1176 with -fsplit-stack -mcmodel=large

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112686

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

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

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Indeed, it is r14-5784-g2f3f8952ff1736.

[Bug target/112686] [14 Regression] ICE: in gen_reg_rtx, at emit-rtl.cc:1176 with -fsplit-stack -mcmodel=large

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112686

Uroš Bizjak <ubizjak at gmail dot com> changed:

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

--- Comment #3 from Uroš Bizjak <ubizjak at gmail dot com> ---
diff --git a/gcc/config/i386/i386.cc b/gcc/config/i386/i386.cc
index 7b922857d80..50e8826dbe5 100644
--- a/gcc/config/i386/i386.cc
+++ b/gcc/config/i386/i386.cc
@@ -10503,7 +10503,7 @@ ix86_expand_split_stack_prologue (void)
              fn = copy_to_suggested_reg (x, reg11, Pmode);
            }
          else
-           fn = split_stack_fn_large;
+           fn = copy_to_suggested_reg (split_stack_fn_large, reg11, Pmode);

          /* When using the large model we need to load the address
             into a register, and we've run out of registers.  So we

[Bug target/112686] [14 Regression] ICE: in gen_reg_rtx, at emit-rtl.cc:1176 with -fsplit-stack -mcmodel=large

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112686

--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Uros Bizjak <uros@gcc.gnu.org>:

https://gcc.gnu.org/g:404ea4c1381398aee162415a88e5cb81c44f8c69

commit r14-5830-g404ea4c1381398aee162415a88e5cb81c44f8c69
Author: Uros Bizjak <ubizjak@gmail.com>
Date:   Fri Nov 24 16:11:27 2023 +0100

    i386: Fix ICE with -fsplit-stack -mcmodel=large [PR112686]

    For -mcmodel=large, we have to load function address to a register.

            PR target/112686

    gcc/ChangeLog:

            * config/i386/i386.cc (ix86_expand_split_stack_prologue): Load
            function address to a register for ix86_cmodel == CM_LARGE.

    gcc/testsuite/ChangeLog:

            * gcc.target/i386/pr112686.c: New test.

[Bug target/112686] [14 Regression] ICE: in gen_reg_rtx, at emit-rtl.cc:1176 with -fsplit-stack -mcmodel=large

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112686

Uroš Bizjak <ubizjak at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|ASSIGNED                    |RESOLVED
                 CC|uros at gcc dot gnu.org            |

--- Comment #5 from Uroš Bizjak <ubizjak at gmail dot com> ---
Fixed.