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. -- Earthling Michel Dänzer | http://www.amd.com Libre software enthusiast | Mesa and X developer _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/mesa-dev
