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Re: ia64 XFmode patch rides again (need ia64-linux testing)
- From: "Zack Weinberg" <zack at codesourcery dot com>
- To: Jan Hubicka <hubicka at ucw dot cz>
- Cc: gcc-patches at gcc dot gnu dot org, Jim Wilson <wilson at specifixinc dot com>, Richard Henderson <rth at redhat dot com>
- Date: Sat, 25 Oct 2003 12:59:34 -0700
- Subject: Re: ia64 XFmode patch rides again (need ia64-linux testing)
- References: <email@example.com><20031025195218.GA29004@atrey.karlin.mff.cuni.cz>
Jan Hubicka <firstname.lastname@example.org> writes:
>> Having now, I hope, removed all the obstructions, this patch once
>> again attempts to support simultaneous use of 80-bit and 128-bit
>> floating point in the ia64 back end. It's much the same as it was the
>> last time -- replace TFmode with XFmode in all hardware insns
>> referring to the extended floating point type; use TFmode exclusively
>> for software emulated IEEE quad. However, instead of using
>> ROUND_TYPE_ALIGN as before, I am using ADJUST_BYTESIZE and
>> ADJUST_ALIGNMENT declarations in ia64-modes.def, which *should* mean
>> that everything obeys the requirements.
> This looks cool. If I understand it right, to get the same done on
> x86-64, where we do have 128-bit long doubles in XFmode format and
> 128-bit __float128, all I need is to define
> ADJUST_BYTESIZE/ADJUST_ALIGNMENT and kill the TFmode duplicates in
> i386.md, right?
I think so. You will also need to define ADJUST_FLOAT_FORMAT; the
selected floating point format has to match the byte size.