https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78429
--- Comment #12 from rguenther at suse dot de <rguenther at suse dot de> --- On Mon, 21 Nov 2016, ebotcazou at gcc dot gnu.org wrote: > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78429 > > --- Comment #10 from Eric Botcazou <ebotcazou at gcc dot gnu.org> --- > > It's built by build_nonstandard_boolean_type via > > > > (gdb) bt > > #0 0x0000000001204281 in build_nonstandard_boolean_type (precision=32) > > at /space/rguenther/src/gcc-git/gcc/tree.c:8219 > > #1 0x000000000120e478 in build_truth_vector_type (nunits=4, vector_size=16) > > at /space/rguenther/src/gcc-git/gcc/tree.c:10919 > > #2 0x000000000118881a in get_mask_type_for_scalar_type ( > > scalar_type=<integer_type 0x2aaaac02a690 int>) > > at /space/rguenther/src/gcc-git/gcc/tree-vect-stmts.c:8958 > > #3 0x00000000019519b2 in search_type_for_mask_1 ( > > var=<ssa_name 0x2aaaac173438>, vinfo=0x28ab530, cache=...) > > at /space/rguenther/src/gcc-git/gcc/tree-vect-patterns.c:3538 > > #4 0x0000000001951be3 in search_type_for_mask (var=<ssa_name > > 0x2aaaac173438>, > > vinfo=0x28ab530) > > Right, so it looks like Ada is not the only producer of non-standard boolean > types, there is even a helper function to do it. Which means that any > language > could be affected by the regression uncovered in Ada. In practice the above is used in vector context only (plus in the extraction the vectorizer builds). I suppose that being more careful at the extraction side may also help papering over this issue. In the end having a bool_with_only_0_and_1 predicate rather than open-coding (several variants of) the test throughout the middle-end might be a good idea... I don't remember off-head why we ended up with BOOLEA_TYPE element vectors instead of using INTEGER_TYPE but I think it was because the x86 backend actually ends up with QImode boolean vectors for the sake of avx512 mask registers. And I opposed to treating 'char' as vector which means we now have vector<bool> with QImode or vector<"bool"> with V4SImode for non-AVX512 targets. So we can identify VECTOR_BOOLEAN_TYPE_P.
