[Bug rtl-optimization/118042] New: ICE: maximum number of generated reload insns per insn achieved (90) with -O1 -fexpensive-optimizations -favoid-store-forwarding -mavx10.1 -mprefer-vector-width=128 --param=store-forwarding-max-distance=256

[zsojka at seznam dot cz via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118042

            Bug ID: 118042
           Summary: ICE: maximum number of generated reload insns per insn
                    achieved (90) with -O1 -fexpensive-optimizations
                    -favoid-store-forwarding -mavx10.1
                    -mprefer-vector-width=128
                    --param=store-forwarding-max-distance=256
           Product: gcc
           Version: 15.0
            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: x86_64-pc-linux-gnu

Created attachment 59867
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=59867&action=edit
reduced testcase

Compiler output:
$ x86_64-pc-linux-gnu-gcc -O1 -fexpensive-optimizations
-favoid-store-forwarding -mavx10.1 -mprefer-vector-width=128
--param=store-forwarding-max-distance=256 testcase.c 
testcase.c: In function 'foo':
testcase.c:6:5: warning: division by zero [-Wdiv-by-zero]
    6 |   v %= 0;
      |     ^~
during RTL pass: reload
testcase.c:7:1: internal compiler error: maximum number of generated reload
insns per insn achieved (90)
    7 | }
      | ^
0x2e0e771 internal_error(char const*, ...)
        /repo/gcc-trunk/gcc/diagnostic-global-context.cc:517
0x14653a0 lra_constraints(bool)
        /repo/gcc-trunk/gcc/lra-constraints.cc:5411
0x144c424 lra(_IO_FILE*, int)
        /repo/gcc-trunk/gcc/lra.cc:2449
0x13f5eef do_reload
        /repo/gcc-trunk/gcc/ira.cc:5977
0x13f5eef execute
        /repo/gcc-trunk/gcc/ira.cc:6165
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-20241214122823-r15-6251-ga6a15bc5b77c87-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/15.0.0/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 --enable-libsanitizer
--disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-20241214122823-r15-6251-ga6a15bc5b77c87-checking-yes-rtl-df-extra-nobootstrap-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 15.0.0 20241214 (experimental) (GCC)