On Jul 25, 2017, at 3:10 PM, Segher Boessenkool <seg...@kernel.crashing.org> wrote: > > On Tue, Jul 25, 2017 at 12:30:13PM +0100, Kyrill Tkachov wrote: >> We sometimes use the __mode__ attribute to force certain sizes in C types. >> For example: typedef int ditype __attribute__ ((mode (DI))); >> Maybe you can do this to force the right sizes. I don't know if there are >> any targets >> that don't support DImode ops though :) > > DImode isn't necessarily the same size on all targets, a byte isn't > always eight bits.
As a practical matter, presently a byte is always eight bits and a DI is always 8 bytes in gcc. :-) Pretending otherwise is a fool's errand. We like to kid ourselves that a character isn't always 8 bits, but the first person to want to do that will discover the lie it is.
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