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I've missed torture/bitint-{93,94}.c FAILs on s390x-linux (i.e. big endian).
For __builtin_mul_overflow, the code to extend the partial most significant
limb is done before memmoving it down, so that limb actually isn't on big
endian at offset 0 but is nelts - obj_nelts. The following patch computes
obj_nelts first, uses it on big-endian and so that the offset checking
asserts don't trigger, on big-endian also uses NULL_TREE first argument to
limb_access.
2026-04-29 Jakub Jelinek <jakub@redhat.com>
PR middle-end/123635
* gimple-lower-bitint.cc (bitint_large_huge::finish_arith_overflow):
Move obj_nelts/atype computation before bitint_extended handling. For
bitint_big_endian in the bitint_extended handling use size_zero_node
only for limb_access_type calls, otherwise use
size_int (nelts - obj_nelts) and pass NULL_TREE as first argument to
limb_access calls.
Reviewed-by: Richard Biener <rguenth@suse.de>
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