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> > I'm not quite convinced by this. On AArch64, GCC supports the %H, %Q > > and %R operand modifiers which very explicitly deal with a pair of > > 64-bit registers. These are intended to be used with the 'r' > > constraint (I asked, specifically because there wasn't a corresponding > > "register-pair" constraint). > > > Admittedly

On Thu, Nov 22, 2012 at 1:19 PM, Tim Northover <t.p.northover at gmail.com> wrote: >> "r" is supposed to be a single register, not a register pair; the fact >> that gcc accepts this is probably an accident. clang should reject >> this code (without crashing, of course). > > I'm not quite convinced by this. On AArch64, GCC supports the %H, %Q > and %R