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* [Bug middle-end/110271] New: [14 Regression] UICE on pycryptodome-3.17.0 during GIMPLE pass: widening_mul: in gsi_replace, at gimple-iterator.cc:437
@ 2023-06-15 18:09 slyfox at gcc dot gnu.org
  2023-06-15 18:11 ` [Bug middle-end/110271] " slyfox at gcc dot gnu.org
                   ` (8 more replies)
  0 siblings, 9 replies; 10+ messages in thread
From: slyfox at gcc dot gnu.org @ 2023-06-15 18:09 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110271

            Bug ID: 110271
           Summary: [14 Regression] UICE on pycryptodome-3.17.0 during
                    GIMPLE pass: widening_mul: in gsi_replace, at
                    gimple-iterator.cc:437
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: slyfox at gcc dot gnu.org
  Target Milestone: ---

Found an ICE on pycryptodome-3.17.0 when building against
r14-1868-ga4df0ce78d6f1b

Reduced example:

// $ cat mont.c.c
unsigned square_sum_hi, square_sum_lo, square_tmp, square_carry, square_tmp2;
void square(unsigned *t, int nw) {
  int i = 0;
  for (; i < nw; i++) {
    square_sum_lo += square_carry;
    square_sum_hi += square_sum_lo < square_carry;
    square_sum_hi += square_tmp = (unsigned long)t > 3;
    square_carry = t[1] + (square_sum_hi < square_tmp);
    square_sum_hi += square_tmp2;
    square_carry += square_sum_hi < square_tmp2;
  }
}
void mont_mult(void) {
  unsigned *t;
  square(t, 9);
}

$ gcc  -fwrapv -O3  -c mont.c.c -o moujnt.o -mavx2 -Wall -Wextra
mont.c.c: In function 'mont_mult':
mont.c.c:15:3: warning: 't' is used uninitialized [-Wuninitialized]
   15 |   square(t, 9);
      |   ^~~~~~~~~~~~
mont.c.c:14:13: note: 't' was declared here
   14 |   unsigned *t;
      |             ^
during GIMPLE pass: widening_mul
mont.c.c:13:6: internal compiler error: in gsi_replace, at
gimple-iterator.cc:437
   13 | void mont_mult(void) {
      |      ^~~~~~~~~
0x6bcf05 gsi_replace(gimple_stmt_iterator*, gimple*, bool)
        ../../source/gcc/gimple-iterator.cc:437
0xe203f4 match_uaddc_usubc
        ../../source/gcc/tree-ssa-math-opts.cc:4880
0xe296f1 after_dom_children
        ../../source/gcc/tree-ssa-math-opts.cc:5581
0x1886063 dom_walker::walk(basic_block_def*)
        ../../source/gcc/domwalk.cc:354
0xe1d76d execute
        ../../source/gcc/tree-ssa-math-opts.cc:5658
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.

$ gcc -v |& unnix
Using built-in specs.
COLLECT_GCC=/<<NIX>>/gcc-14.0.0/bin/gcc
COLLECT_LTO_WRAPPER=/<<NIX>>/gcc-14.0.0/libexec/gcc/x86_64-unknown-linux-gnu/14.0.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with:
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 14.0.0 99999999 (experimental) (GCC)

^ permalink raw reply	[flat|nested] 10+ messages in thread
end of thread, other threads:[~2023-06-17  8:34 UTC | newest]

Thread overview: 10+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-06-15 18:09 [Bug middle-end/110271] New: [14 Regression] UICE on pycryptodome-3.17.0 during GIMPLE pass: widening_mul: in gsi_replace, at gimple-iterator.cc:437 slyfox at gcc dot gnu.org
2023-06-15 18:11 ` [Bug middle-end/110271] " slyfox at gcc dot gnu.org
2023-06-15 19:17 ` [Bug tree-optimization/110271] " pinskia at gcc dot gnu.org
2023-06-15 19:19 ` pinskia at gcc dot gnu.org
2023-06-15 19:34 ` pinskia at gcc dot gnu.org
2023-06-15 20:52 ` jakub at gcc dot gnu.org
2023-06-16 17:48 ` cvs-commit at gcc dot gnu.org
2023-06-16 18:02 ` jakub at gcc dot gnu.org
2023-06-16 20:43 ` slyfox at gcc dot gnu.org
2023-06-17  8:34 ` pinskia at gcc dot gnu.org

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