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Re: [ft-devel] Experimental: v38 interpreter with minimal backwards comp

From: Nikolaus Waxweiler
Subject: Re: [ft-devel] Experimental: v38 interpreter with minimal backwards compatibility mode and linear advance widths
Date: Fri, 11 Mar 2016 20:23:15 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0

Mhmm.  This is too hars harsh.  I would rather simply stop
interpretation of delta instructions but let everything else work.
For example, IUP[xy] could be called within conditionals, and it would
be bad if the following `EIF' doesn't get interpreted, causing
unwarranted execution failures.

Or, how about doing

if ( exc->backwards_compatibility && exc->iupx_called && exc->iupy_called )
    goto LNo_Error_;

at the top of the instruction execution loop? Just pretend everything is okay?

I mean, is there any point in continuing if DELTAP/SHPIXes are denied anyway? That would also save a few backwards-compatibility-ifs and probably yield a tiny performance boost on core web fonts, a nice selling point for a Phoronix article ;)

Or is there anything else that can cause execution failures? Any clean-up that would need to be done?

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