src/compiler/nir/nir_strip.c

   1 /*
   2  * Copyright © 2019 Valve 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 "util/debug.h"
  27
  28 /* This pass removes information which is only useful for debugging,
  29  * making cache hits from similar shaders more likely.
  30  */
  31
  32 static void
  33 strip_variable(nir_variable *var)
  34 {
  35    var->name = NULL;
  36
  37    if (var->data.mode != nir_var_shader_in &&
  38        var->data.mode != nir_var_shader_out) {
  39       /* We assume that this is called after nir_lower_io(), at which point
  40        * the original user-facing location is irrelevant except for inputs and
  41        * outputs.
  42        */
  43       var->data.location = 0;
  44    }
  45 }
  46
  47 static void
  48 strip_register(nir_register *reg)
  49 {
  50    reg->name = NULL;
  51 }
  52
  53 static bool
  54 strip_def(nir_ssa_def *def, void *_unused)
  55 {
  56    (void) _unused;
  57    def->name = NULL;
  58    return true;
  59 }
  60
  61 static void
  62 strip_impl(nir_function_impl *impl)
  63 {
  64    nir_index_ssa_defs(impl);
  65
  66    nir_foreach_variable(var, &impl->locals)
  67       strip_variable(var);
  68    nir_foreach_register(reg, &impl->registers)
  69       strip_register(reg);
  70    nir_foreach_block(block, impl) {
  71       nir_foreach_instr(instr, block) {
  72          nir_foreach_ssa_def(instr, strip_def, NULL);
  73       }
  74    }
  75 }
  76
  77 void
  78 nir_strip(nir_shader *shader)
  79 {
  80    static int should_strip = -1;
  81    if (should_strip < 0)
  82       should_strip = env_var_as_boolean("NIR_STRIP", true);
  83    if (!should_strip)
  84       return;
  85
  86    shader->info.name = NULL;
  87    shader->info.label = NULL;
  88
  89    nir_foreach_variable(var, &shader->uniforms)
  90       strip_variable(var);
  91    nir_foreach_variable(var, &shader->inputs)
  92       strip_variable(var);
  93    nir_foreach_variable(var, &shader->outputs)
  94       strip_variable(var);
  95    nir_foreach_variable(var, &shader->system_values)
  96       strip_variable(var);
  97    nir_foreach_variable(var, &shader->globals)
  98       strip_variable(var);
  99
 100    nir_foreach_function(func, shader) {
 101       if (func->impl)
 102          strip_impl(func->impl);
 103    }
 104 }