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      1 /*
      2  * Copyright  2015 Intel Corporation
      3  *
      4  * Permission is hereby granted, free of charge, to any person obtaining a
      5  * copy of this software and associated documentation files (the "Software"),
      6  * to deal in the Software without restriction, including without limitation
      7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
      8  * and/or sell copies of the Software, and to permit persons to whom the
      9  * Software is furnished to do so, subject to the following conditions:
     10  *
     11  * The above copyright notice and this permission notice (including the next
     12  * paragraph) shall be included in all copies or substantial portions of the
     13  * Software.
     14  *
     15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
     20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
     21  * IN THE SOFTWARE.
     22  *
     23  */
     24 
     25 #include "nir.h"
     26 #include "nir_builder.h"
     27 
     28 /*
     29  * lowers:
     30  *
     31  * packDouble2x32(foo) -> packDouble2x32Split(foo.x, foo.y)
     32  * unpackDouble2x32(foo) -> vec2(unpackDouble2x32_x(foo), unpackDouble2x32_y(foo))
     33  */
     34 
     35 static nir_ssa_def *
     36 lower_pack_double(nir_builder *b, nir_ssa_def *src)
     37 {
     38    return nir_pack_double_2x32_split(b, nir_channel(b, src, 0),
     39                                         nir_channel(b, src, 1));
     40 }
     41 
     42 static nir_ssa_def *
     43 lower_unpack_double(nir_builder *b, nir_ssa_def *src)
     44 {
     45    return nir_vec2(b, nir_unpack_double_2x32_split_x(b, src),
     46                       nir_unpack_double_2x32_split_y(b, src));
     47 }
     48 
     49 static void
     50 lower_double_pack_impl(nir_function_impl *impl)
     51 {
     52    nir_builder b;
     53    nir_builder_init(&b, impl);
     54 
     55    nir_foreach_block(block, impl) {
     56       nir_foreach_instr_safe(instr, block) {
     57          if (instr->type != nir_instr_type_alu)
     58             continue;
     59 
     60          nir_alu_instr *alu_instr = (nir_alu_instr *) instr;
     61 
     62          if (alu_instr->op != nir_op_pack_double_2x32 &&
     63              alu_instr->op != nir_op_unpack_double_2x32)
     64             continue;
     65 
     66          b.cursor = nir_before_instr(&alu_instr->instr);
     67 
     68          nir_ssa_def *src = nir_ssa_for_alu_src(&b, alu_instr, 0);
     69          nir_ssa_def *dest =
     70             alu_instr->op == nir_op_pack_double_2x32 ?
     71             lower_pack_double(&b, src) :
     72             lower_unpack_double(&b, src);
     73 
     74          nir_ssa_def_rewrite_uses(&alu_instr->dest.dest.ssa, nir_src_for_ssa(dest));
     75          nir_instr_remove(&alu_instr->instr);
     76       }
     77    }
     78 }
     79 
     80 void
     81 nir_lower_double_pack(nir_shader *shader)
     82 {
     83    nir_foreach_function(function, shader) {
     84       if (function->impl)
     85          lower_double_pack_impl(function->impl);
     86    }
     87 }
     88 
     89