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Message-ID: <20240613010654.GV10433@brightrain.aerifal.cx> Date: Wed, 12 Jun 2024 21:06:55 -0400 From: Rich Felker <dalias@...c.org> To: "Ram Nalamothu (QUIC)" <quic_vnalamot@...cinc.com> Cc: "musl@...ts.openwall.com" <musl@...ts.openwall.com> Subject: Re: Integer only print functions support in MUSL On Wed, Jun 12, 2024 at 05:29:59PM +0000, Ram Nalamothu (QUIC) wrote: > Hi, > > On the subject line topic, is there a plan for integer only print > functions support in MUSL upstream? > > The newlib seems to support the same since 2004 [1] and one > immediate scenario using this capability is assert function [2] in > the C library itself which needs to print only the non-float types. > > Applications that use integer only print functions can benefit from > this capability in terms of reduced code size by avoiding floating > point support implementation in the linked print functions. > > I tried a quick search on the mailing list but couldn't find any > previous discussions on this topic. > Would it make sense to have the similar support in MUSL as well? > Would the community be open to accept patches supporting integer > only print functions? My leaning is no. There is no major precedent for this, no hard *need* (it's only an optimization hint to make up for other failed optimizations), and to do it completely and consistently it's a combinatoric explosion (doubling the number of printf-family functions). At the very least you'd need (and this would be application-unfriendly to have just these) i versions of vfprintf and vsnprintf; everything else can be built on them. But to get back to the point, on archs that are hard-float and don't have an oversized soft-only long double, the size of the floating point code in printf is around 6k. Only the most extreme environments would warrant exploding complexity like that to save 6k. A better way to meet their needs would probably be to provide a way to dummy-out float support at link-time, by putting fmt_fp in its own TU and having some trick to keep it from getting linked if you use the right LDFLAGS. But unless there is a really good documented widespread need for this, I can't see it making sense to do hacks like that upstream in musl. Rich
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