On Sat, Apr 16, 2016 at 3:28 PM, Roland Scheidegger <srol...@vmware.com> wrote: > Am 16.04.2016 um 15:19 schrieb eocallag...@alterapraxis.com: >> On 2016-04-16 20:20, Marek Olšák wrote: >>> On Sat, Apr 16, 2016 at 8:04 AM, Michel Dänzer <mic...@daenzer.net> >>> wrote: >>>> On 16.04.2016 14:51, Michel Dänzer wrote: >>>>> On 16.04.2016 11:39, Tom Stellard wrote: >>>>>> The ds_bpermute instruction allows threads to transfer data directly >>>>>> to or from the vgprs of other threads. These instructions use the lds >>>>>> hardware to transfer data, but do not read or write lds memory. >>>>>> >>>>>> DDX BEFORE: | DDX AFTER: >>>>>> | >>>>>> v_mbcnt_lo_u32_b32_e64 v2, -1, 0 | v_mbcnt_lo_u32_b32_e64 v2, -1, 0 >>>>>> v_mbcnt_hi_u32_b32_e64 v2, -1, v2 | v_mbcnt_hi_u32_b32_e64 v2, >>>>>> -1, v2 >>>>>> v_lshlrev_b32_e32 v4, 2, v2 | v_and_b32_e32 v2, 0x3ffffffc, v2 >>>>>> v_and_b32_e32 v2, -4, v2 | v_lshlrev_b32_e32 v2, 2, v2 >>>>>> v_lshlrev_b32_e32 v3, 2, v2 | ds_bpermute_b32 v3, v2, v0 >>>>>> s_mov_b32 m0, -1 | ds_bpermute_b32 v0, v2, v0 >>>>>> offset:4 >>>>>> ds_write_b32 v4, v0 | s_waitcnt lgkmcnt(0) >>>>>> s_waitcnt lgkmcnt(0) | >>>>>> v_or_b32_e32 v0, 1, v2 | >>>>>> v_lshlrev_b32_e32 v0, 2, v0 | >>>>>> ds_read_b32 v1, v3 | >>>>>> ds_read_b32 v0, v0 | >>>>>> s_waitcnt lgkmcnt(0) | >>>>>> | >>>>>> LDS: 1 blocks | LDS: 0 blocks >>>>> >>>>> Nice. >>>>> >>>>> >>>>> Were these intrinsics already available in LLVM 3.6? If not, the old >>>>> code needs to be kept for backwards compatibility. >>>> >>>> I can see now that you're taking care of this for the bpermute >>>> intrinsic, but AFAICT the mbcnt intrinsics were only added in LLVM 3.8. >>> >>> How do you feel about increasing the requirement to LLVM 3.8 for Mesa >>> git? >> >> +1 from me. Supporting more than two generations of LLVM is a bit much >> to carry imho. >> > > You don't want to support any released version which is older than one > month? > (This isn't an objection, just a remark...)
Life's hard. Sometimes we have to make hard choices. :) Now seriously, LLVM 3.7 enables OpenGL 4.0-4.1 and LLVM 3.8 enables immediate shader compilation (without recompilations) for radeonsi. I'll let others assess how important those two are. Marek _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/mesa-dev
