On Sun, Oct 11, 2015 at 7:08 AM, Marek Olšák <mar...@gmail.com> wrote: > On Sun, Oct 11, 2015 at 4:12 AM, Connor Abbott <cwabbo...@gmail.com> wrote: >> FWIW, this isn't quite correct with ARB_shader_precision or GL4.1 -- >> it specifies that infinities should be correctly generated through >> division by 0, which unsafe-fp-math doesn't guarantee. At least, >> that's assuming this is similar to the "fast" per-instruction flag >> (http://llvm.org/docs/LangRef.html#fast-math-flags) which says "This >> flag implies all the others." > > We don't use the per-instruction flags yet. > > Sadly, we need this flag to be able to get (1/sqrt) -> RSQ and (1/x) > -> RCP. LLVM doesn't have standard intrinsics for those instructions, > so we have to unwind them and rely on LLVM to combine them. Without > it, the TGSI->LLVM conversion would produce worse code. > > Marek
Right, but you're also allowing transforms which GLSL explicitly disallows. It sounds like you need more precise control than what LLVM currently offers. Connor _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/mesa-dev
