Date: Tue, 27 Nov 2018 13:52:01 +0100 From: Szabolcs Nagy <nsz@...t70.net> To: musl@...ts.openwall.com Subject: Re: 32-bit double and long double * Rich Felker <dalias@...c.org> [2018-11-26 21:32:11 -0500]: > On Mon, Nov 26, 2018 at 05:36:58PM +0000, Jon Chesterfield wrote: > > Arguments to variadic functions promote to double. Again I would prefer 32 > > bit float. > > Indeed this is a hard limitation of the language. I suppose it comes > in mostly/only for passing floating point values to printf. The > promotion should at least be nothing more than a few 64-bit shift/or > ops. well floating-point is usually tricky.. conversion to double should signal an invalid exception for snan. subnormal range values need different logic than normal range ones and likely require a clz operation. if you support flush-to-zero arithmetics then subnormal input should raise an input-denormal exception and treat it as zero. ..but all this is implemented in libgcc soft-fp support.
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