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The BIT_FIELD_REF verifier has:
if (INTEGRAL_TYPE_P (TREE_TYPE (op))
&& !type_has_mode_precision_p (TREE_TYPE (op)))
{
error ("%qs of non-mode-precision operand", code_name);
return true;
}
check among other things, so one can't extract something out of say
_BitInt(63) or _BitInt(4096).
The new ifcombine optimization happily creates such BIT_FIELD_REFs
and ICEs during their verification.
The following patch fixes that by rejecting those in decode_field_reference.
2024-12-14 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/118023
* gimple-fold.cc (decode_field_reference): Return NULL_TREE if
inner has non-type_has_mode_precision_p integral type.
* gcc.dg/bitint-119.c: New test.
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