Am 17.12.18 um 23:07 schrieb Ilia Mirkin: > On Mon, Dec 17, 2018 at 5:05 PM Ian Romanick <i...@freedesktop.org> wrote: >> >> https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgitlab.freedesktop.org%2Fmesa%2Fmesa%2Fmerge_requests%2F22&data=02%7C01%7Csroland%40vmware.com%7C5773f37aa397417e6beb08d6646c24c6%7Cb39138ca3cee4b4aa4d6cd83d9dd62f0%7C0%7C0%7C636806812986635916&sdata=z2ev4sVJEW8Kw2hsoNWfYHh6FkSwSy%2B5CdTItxoh%2FPE%3D&reserved=0 >> >> This series adds a new optimization pass that tries to replace code >> sequences like >> >> if (x < y) { >> z = y - x; >> ... >> } >> >> with a sequence like >> >> t = x - y; >> if (t < 0) { >> z = -t; >> ... >> } > > Is it worth worrying about infinities? e.g. if x = -Infinity, y = > Infinity, "x < y" will be true, but "x - y < 0" will not be (pretty > sure it'll be a NaN, which is not < 0).
I was wondering the same, but I think this should still work. -Inf - Inf = -Inf, so no problem there. Roland > -ilia _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/mesa-dev
