I don't think there are any compilers that support x64 without SSE2. SSE2 registers are required for passing float parameters in both MS and System V ABIs.
-Jeff On Mon, Feb 1, 2016 at 6:00 PM, Xidorn Quan <quanxunz...@gmail.com> wrote: > On Tue, Feb 2, 2016 at 7:04 AM, Benjamin Smedberg <benja...@smedbergs.us> > wrote: >> >> >> On 1/29/2016 2:05 PM, Cameron Kaiser wrote: >>> >>> On 1/29/16 9:43 AM, Ashley Gullen wrote: >>>> >>>> FWIW, the Steam Hardware Survey says 99.99% of users have SSE2 (under >>>> "other settings"): http://store.steampowered.com/hwsurvey >>> >>> >>> For that to be valid, one must assume that the population of Firefox users >>> and Steam users are sufficiently similar. I don't think that's necessarily >>> true since most Steam titles have substantially higher system requirements. >> >> The last time we broke this (by accident) was several years ago. At the >> time, we got vigorous complaining from various people who had relatively >> recent bare-bones machines without SSE2. >> >> It might be worth reconsidering now: I'm not willing to throw away 0.5% of >> our users without good cause, but perhaps there is a good cause to be made >> here? What would the performance gain be for the remaining 99.5% of users, >> realizing that we already have dynamic SSE2/non-SSE switching in place for >> some of our hottest paths. > > The main question here I think is, whether we've enabled SSE2 for 64bit build > > It seems to me if we do, whether enabling SSE2 on x86 doesn't really > matter unless we have a good reason. Fewer and fewer people would > stick on x86, especially who cares about performance. > > If we haven't yet done that, we should. It seems to me the majority > processors which supports x64 also supports SSE2. If there are really > some people who use a processor doesn't support SSE2 but are using > 64bit Firefox, they could simply back to use the 32bit version. > > - Xidorn > _______________________________________________ > dev-platform mailing list > dev-platform@lists.mozilla.org > https://lists.mozilla.org/listinfo/dev-platform _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
