[Bug rtl-optimization/105211] ICE: SIGSEGV in contains_struct_check (tree.h:3570) with -Os -ffast-math and __builtin_roundf()

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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105211

--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jakub Jelinek <jakub@gcc.gnu.org>:

https://gcc.gnu.org/g:91a38e8a848c61b2e23ee277306dc8cd194d135b

commit r12-8101-g91a38e8a848c61b2e23ee277306dc8cd194d135b
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Tue Apr 12 09:16:06 2022 +0200

    builtins: Fix up expand_builtin_int_roundingfn_2 [PR105211]

    The expansion of __builtin_iround{,f,l} etc. builtins in some cases
    emits calls to a different fallback builtin.  To locate the right builtin
    it uses mathfn_built_in_1 with the type of the first argument.
    If its TYPE_MAIN_VARIANT is {float,double,long_double}_type_node, all is
    fine, but on the following testcase, because GIMPLE considers scalar
    float conversions between types with the same mode as useless,
    TYPE_MAIN_VARIANT of the arg's type is float32_type_node and because there
    isn't __builtin_lroundf32 returns NULL and we ICE.

    This patch will first try the type of the first argument of the builtin's
    prototype (so that say on sizeof(double)==sizeof(long double) target it
honors
    whether it was a *l or non-*l call; though even that can't be 100% trusted,
    user could incorrectly prototype it) and as fallback the type argument.
    If neither works, doesn't fallback.

    2022-04-11  Jakub Jelinek  <jakub@redhat.com>

            PR rtl-optimization/105211
            * builtins.cc (expand_builtin_int_roundingfn_2): If
mathfn_built_in_1
            fails for TREE_TYPE (arg), retry it with
            TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (fndecl))) and if even that
            fails, emit call normally.

            * gcc.dg/pr105211.c: New test.