kc3-lang/angle/src/compiler/translator/tree_ops/PruneNoOps.h

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• Author : Shahbaz Youssefi
  Date : 2021-06-12 01:37:32
  Hash : 3f9dcb00
  Message : Translator: Prune trivial dead code Code after discard, return, break and continue is discarded with this change. This simplifies SPIR-V generation as no code is allowed after a branch instruction and no special handling is necessary after this change. Bug: angleproject:4889 Change-Id: Ife9c8de8a6d0db9d682561daf44366aad9b1cf61 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2957811 Reviewed-by: Tim Van Patten <timvp@google.com> Reviewed-by: Jonah Ryan-Davis <jonahr@google.com> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>

• src/compiler/translator/tree_ops/PruneNoOps.h

• //
  // Copyright 2002 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  // PruneNoOps.h: The PruneNoOps function prunes:
  //   1. Empty declarations "int;". Empty declarators will be pruned as well, so for example:
  //        int , a;
  //      is turned into
  //        int a;
  //   2. Literal statements: "1.0;". The ESSL output doesn't define a default precision for float,
  //      so float literal statements would end up with no precision which is invalid ESSL.
  //   3. Statements after discard, return, break and continue.
  
  #ifndef COMPILER_TRANSLATOR_TREEOPS_PRUNENOOPS_H_
  #define COMPILER_TRANSLATOR_TREEOPS_PRUNENOOPS_H_
  
  #include "common/angleutils.h"
  
  namespace sh
  {
  class TCompiler;
  class TIntermBlock;
  class TSymbolTable;
  
  ANGLE_NO_DISCARD bool PruneNoOps(TCompiler *compiler,
                                   TIntermBlock *root,
                                   TSymbolTable *symbolTable);
  }  // namespace sh
  
  #endif  // COMPILER_TRANSLATOR_TREEOPS_PRUNENOOPS_H_