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? Marek _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/mesa-dev
