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)
