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intel/fs: Use a single untyped surface read for load_num_work_groups

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There's no good reason to split this into three.  Sure, CS indirects are
only guaranteed by the spec to be DWORD aligned, but that's all untyped
surface reads require anyway.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6570>
This commit is contained in:
Jason Ekstrand 2020-09-01 14:34:44 -05:00 • committed by Marge Bot
parent 8e8701b43a
commit 5799da47c7
1 changed files with 5 additions and 7 deletions
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12
src/intel/compiler/brw_fs_nir.cpp
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@ -3767,14 +3767,12 @@ fs_visitor::nir_emit_cs_intrinsic(const fs_builder &bld,
fs_reg srcs[SURFACE_LOGICAL_NUM_SRCS];
srcs[SURFACE_LOGICAL_SRC_SURFACE] = brw_imm_ud(surface);
srcs[SURFACE_LOGICAL_SRC_IMM_DIMS] = brw_imm_ud(1);
srcs[SURFACE_LOGICAL_SRC_IMM_ARG] = brw_imm_ud(1); /* num components */
/* Read the 3 GLuint components of gl_NumWorkGroups */
for (unsigned i = 0; i < 3; i++) {
srcs[SURFACE_LOGICAL_SRC_ADDRESS] = brw_imm_ud(i << 2);
srcs[SURFACE_LOGICAL_SRC_IMM_ARG] = brw_imm_ud(3); /* num components */
srcs[SURFACE_LOGICAL_SRC_ADDRESS] = brw_imm_ud(0);
fs_inst *inst =
bld.emit(SHADER_OPCODE_UNTYPED_SURFACE_READ_LOGICAL,
offset(dest, bld, i), srcs, SURFACE_LOGICAL_NUM_SRCS);
}
dest, srcs, SURFACE_LOGICAL_NUM_SRCS);
inst->size_written = 3 * dispatch_width * 4;
break;
}