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      1 /*
      2  * Copyright  2017 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 #include "nir.h"
     25 #include "nir_builder.h"
     26 
     27 /**
     28  * \file nir_opt_intrinsics.c
     29  */
     30 
     31 static bool
     32 opt_intrinsics_impl(nir_function_impl *impl)
     33 {
     34    nir_builder b;
     35    nir_builder_init(&b, impl);
     36    bool progress = false;
     37 
     38    nir_foreach_block(block, impl) {
     39       nir_foreach_instr_safe(instr, block) {
     40          if (instr->type != nir_instr_type_intrinsic)
     41             continue;
     42 
     43          nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
     44          nir_ssa_def *replacement = NULL;
     45          b.cursor = nir_before_instr(instr);
     46 
     47          switch (intrin->intrinsic) {
     48          case nir_intrinsic_vote_any:
     49          case nir_intrinsic_vote_all:
     50             if (nir_src_as_const_value(intrin->src[0]))
     51                replacement = nir_ssa_for_src(&b, intrin->src[0], 1);
     52             break;
     53          case nir_intrinsic_vote_eq:
     54             if (nir_src_as_const_value(intrin->src[0]))
     55                replacement = nir_imm_int(&b, NIR_TRUE);
     56             break;
     57          default:
     58             break;
     59          }
     60 
     61          if (!replacement)
     62             continue;
     63 
     64          nir_ssa_def_rewrite_uses(&intrin->dest.ssa,
     65                                   nir_src_for_ssa(replacement));
     66          nir_instr_remove(instr);
     67          progress = true;
     68       }
     69    }
     70 
     71    return progress;
     72 }
     73 
     74 bool
     75 nir_opt_intrinsics(nir_shader *shader)
     76 {
     77    bool progress = false;
     78 
     79    nir_foreach_function(function, shader) {
     80       if (!function->impl)
     81          continue;
     82 
     83       if (opt_intrinsics_impl(function->impl)) {
     84          progress = true;
     85          nir_metadata_preserve(function->impl, nir_metadata_block_index |
     86                                                nir_metadata_dominance);
     87       }
     88    }
     89 
     90    return progress;
     91 }
     92