Date: Sat, 25 May 2019 13:50:24 -0700 From: Yuri <yuri@rawbw.com> To: Konstantin Belousov <kostikbel@gmail.com> Cc: Freebsd hackers list <freebsd-hackers@freebsd.org> Subject: Re: What is the portable 128-bit floating point type? Message-ID: <e13bc70d-4d7e-3407-a0a0-14a64f94addd@rawbw.com> In-Reply-To: <20190525200437.GV2748@kib.kiev.ua> References: <eb15d9e4-c1d4-3886-a3b7-1264c12396cd@rawbw.com> <20190525200437.GV2748@kib.kiev.ua>
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On 2019-05-25 13:04, Konstantin Belousov wrote: > Neither i386 nor amd64 have hardware-supported 128 bit floating point > type. long double is defined by both i386 and amd64 Unix ABI as 80 bits > (10 bytes) representation as defined by IEEEE FP standard and supported > by x87 FPU (not-SSE). The difference in size is due to the different > natural alignment between 32 and 64 bit ISA. So it looks like there is no true quad-precision float available. Based on this conversation https://github.com/bluescarni/mppp/issues/186 FreeBSD used to support __float128. Why was it removed? Yuri
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