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From: "tnfchris at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/103253] [12 Regression] ICE: Segmentation
 fault (in convert_mult_to_fma or in vect_recog_mask_conversion_pattern) since
 r12-5129-g8ed62c929c7c4462
Date: Tue, 16 Nov 2021 10:12:51 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103253

--- Comment #9 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
> We might want to eventually special-case some of the internal fns
> in internal_fn_flags?  Or have a special ECF_FP_TRAP which
> we'd rewrite in internal_fn_flags based on flag_trapping_math
> (but we'd need a caller context to be able to lookup the correct
> flag_trapping_math here).  Alternatively whoever adds those
> patterns should mark the GIMPLE call as gimple_call_nothrow
> (that might be genmatch generated code in this case).

That last part seems easiest to do in this case, what's the best way
to tell genmatch to do so for some internal-fns.  does genmatch have
access to the ECF attributes or is it just doing symbolic rewriting?=