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Re: [patch]: Add support of new __int128 type for targets having 128-bit integer scalar support
> Well, AFAICS it is guaranteed. See targhook.c for default
> implementation of scalar_mode_supported_p
> (default_scalar_mode_supported_p): Which rejects - for targets not
> overriding it - modes > 2 * BITS_PER_WORD.
So you have tested the patch only on platforms that don't support __int128?
MAX_FIXED_MODE_SIZE is the default (GET_MODE_BITSIZE (DImode)) on x86/x86-64.