i965/vec4: Implement nir_op_pack_uvec2_to_uint.

And mark nir_op_pack_uvec4_to_uint unreachable, since it's only produced
by lowering pack[SU]norm4x8 which the vec4 backend does not need.

Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>

diff --git a/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp b/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp
index 1b87e3044c2efac19a679ed0c3488c97c6ced25f..d3ac7ab61f72a935f4d2867a845a895d3f9ab093 100644 (file)
--- a/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp
@@ -1325,6 +1325,24 @@ vec4_visitor::nir_emit_alu(nir_alu_instr *instr)
    case nir_op_pack_unorm_2x16:
       unreachable("not reached: should be handled by lower_packing_builtins");
 
+   case nir_op_pack_uvec4_to_uint:
+      unreachable("not reached");
+
+   case nir_op_pack_uvec2_to_uint: {
+      dst_reg tmp1 = dst_reg(this, glsl_type::uint_type);
+      tmp1.writemask = WRITEMASK_X;
+      op[0].swizzle = BRW_SWIZZLE_YYYY;
+      emit(SHL(tmp1, op[0], src_reg(brw_imm_ud(16u))));
+
+      dst_reg tmp2 = dst_reg(this, glsl_type::uint_type);
+      tmp2.writemask = WRITEMASK_X;
+      op[0].swizzle = BRW_SWIZZLE_XXXX;
+      emit(AND(tmp2, op[0], src_reg(brw_imm_ud(0xffffu))));
+
+      emit(OR(dst, src_reg(tmp1), src_reg(tmp2)));
+      break;
+   }
+
    case nir_op_unpack_half_2x16:
       /* As NIR does not guarantee that we have a correct swizzle outside the
        * boundaries of a vector, and the implementation of emit_unpack_half_2x16