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* [Bug tree-optimization/97929] New: ICE: in exact_div, at poly-int.h:2219 (vect_get_num_vectors)
@ 2020-11-20 14:45 acoplan at gcc dot gnu.org
  2020-11-20 14:46 ` [Bug tree-optimization/97929] [11 Regression] " acoplan at gcc dot gnu.org
                   ` (4 more replies)
  0 siblings, 5 replies; 6+ messages in thread
From: acoplan at gcc dot gnu.org @ 2020-11-20 14:45 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97929

            Bug ID: 97929
           Summary: ICE: in exact_div, at poly-int.h:2219
                    (vect_get_num_vectors)
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: acoplan at gcc dot gnu.org
  Target Milestone: ---

For the following testcase:

extern int a[];
void b(short c) {
  for (long d; d; d += 1)
    a[d] = -(1 - c);
}

we ICE on AArch64 with:

$ aarch64-elf-gcc -c -O1 -ftree-vectorize test.c
during GIMPLE pass: vect
test.c: In function 'b':
test.c:2:6: internal compiler error: in exact_div, at poly-int.h:2219
    2 | void b(short c) {
      |      ^
0x109cf78 poly_int<2u, poly_result<unsigned long, if_nonpoly<unsigned long,
unsigned long, poly_int_traits<unsigned long>::is_poly>::type,
poly_coeff_pair_traits<unsigned long, if_nonpoly<unsigned long, unsigned long,
poly_int_traits<unsigned long>::is_poly>::type>::result_kind>::type>
exact_div<2u, unsigned long, unsigned long>(poly_int_pod<2u, unsigned long>
const&, unsigned long)
        /home/alecop01/toolchain/src/gcc/gcc/poly-int.h:2219
0x109cf78 poly_int<2u, poly_result<unsigned long, unsigned long,
poly_coeff_pair_traits<unsigned long, unsigned long>::result_kind>::type>
exact_div<2u, unsigned long, unsigned long>(poly_int_pod<2u, unsigned long>
const&, poly_int_pod<2u, unsigned long> const&)
        /home/alecop01/toolchain/src/gcc/gcc/poly-int.h:2232
0x109cf78 vect_get_num_vectors
        /home/alecop01/toolchain/src/gcc/gcc/tree-vectorizer.h:1617
0x109cf78 vect_get_num_copies
        /home/alecop01/toolchain/src/gcc/gcc/tree-vectorizer.h:1628
0x109cf78 vectorizable_conversion
        /home/alecop01/toolchain/src/gcc/gcc/tree-vect-stmts.c:4686
0x10b8f31 vect_analyze_stmt(vec_info*, _stmt_vec_info*, bool*, _slp_tree*,
_slp_instance*, vec<stmt_info_for_cost, va_heap, vl_ptr>*)
        /home/alecop01/toolchain/src/gcc/gcc/tree-vect-stmts.c:10694
0x10d9660 vect_analyze_loop_operations
        /home/alecop01/toolchain/src/gcc/gcc/tree-vect-loop.c:1758
0x10db3be vect_analyze_loop_2
        /home/alecop01/toolchain/src/gcc/gcc/tree-vect-loop.c:2478
0x10db3be vect_analyze_loop(loop*, vec_info_shared*)
        /home/alecop01/toolchain/src/gcc/gcc/tree-vect-loop.c:2925
0x110a3df try_vectorize_loop_1
        /home/alecop01/toolchain/src/gcc/gcc/tree-vectorizer.c:995
0x110a917 try_vectorize_loop
        /home/alecop01/toolchain/src/gcc/gcc/tree-vectorizer.c:1148
0x110acf1 vectorize_loops()
        /home/alecop01/toolchain/src/gcc/gcc/tree-vectorizer.c:1229
0xf95b63 execute
        /home/alecop01/toolchain/src/gcc/gcc/tree-ssa-loop.c:414
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.

I can reproduce this since r11-5165-gd84ba819fe. However, prior to this commit,
the build was broken since r11-5158-gec383f0bd, so the ICE could have been
introduced by any of these commits:

d84ba819fe2 Fix bootstrap
717e22dcd48 Fix gcc.dg/pr97897.c
b08e0ee3018 refactor reassocs get_rank
d8cf8976749 Fix operand_equal_p hash and copare of ODR_TYPE_REF
27842e2a1eb [3/3] [AArch64][vect] vec_widen_lshift pattern
9fc9573f9a5 [2/3] [vect] Add widening add, subtract patterns
ec46904edfe [1/3][aarch64] Add vec_widen patterns to aarch64
ec383f0bdb4 tree-optimization/97901 - ICE propagating out LC PHIs

^ permalink raw reply	[flat|nested] 6+ messages in thread
end of thread, other threads:[~2020-12-10 12:01 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
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2020-11-20 14:45 [Bug tree-optimization/97929] New: ICE: in exact_div, at poly-int.h:2219 (vect_get_num_vectors) acoplan at gcc dot gnu.org
2020-11-20 14:46 ` [Bug tree-optimization/97929] [11 Regression] " acoplan at gcc dot gnu.org
2020-11-20 14:55 ` rguenth at gcc dot gnu.org
2020-11-20 15:27 ` ktkachov at gcc dot gnu.org
2020-12-10 11:59 ` cvs-commit at gcc dot gnu.org
2020-12-10 12:01 ` joelh at gcc dot gnu.org

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