2015-01-13 14:28 GMT+03:00 Jakub Jelinek <ja...@redhat.com>: > On Tue, Jan 13, 2015 at 02:14:30PM +0300, Andrew Senkevich wrote: >> >> Consensus is required to commit x86_64 vector math functions by Glibc >> >> maintainer. >> > >> > With the difference that b stands for SSE2, not SSE4, and the fact >> > that those functions do not use the __regcall calling conventions, but >> > normal psABI calling conventions after replacing the arguments/return >> > values >> > with the vectors documented in the 0.9.5 pdf (and/or adding the vector mask >> > arg) it describes what has been implemented, yes. >> >> But which name use for SSE4? >> Gcc generates the same as for SSE2, and we now have SSE4 implementations. > > You probably need to use IFUNC for that. The problem is that the > _Z*b* symbol can be called even in code that requires only SSE2 HW, so you > can't assume that because somebody called you through this symbol you have > SSE4 available. You know you have at least SSE2 or higher available.
Ok, we can add SSE2 implementations and IFUNC selection and reflect it in agreement also. -- WBR, Andrew
