diff options
Diffstat (limited to 'src/panfrost/midgard/midgard_opt_dce.c')
-rw-r--r-- | src/panfrost/midgard/midgard_opt_dce.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/src/panfrost/midgard/midgard_opt_dce.c b/src/panfrost/midgard/midgard_opt_dce.c new file mode 100644 index 00000000000..6621c2fe2dd --- /dev/null +++ b/src/panfrost/midgard/midgard_opt_dce.c @@ -0,0 +1,46 @@ +/* + * Copyright (C) 2018 Alyssa Rosenzweig + * Copyright (C) 2019 Collabora, Ltd. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ + +#include "compiler.h" + +/* Basic dead code elimination on the MIR itself */ + +bool +midgard_opt_dead_code_eliminate(compiler_context *ctx, midgard_block *block) +{ + bool progress = false; + + mir_foreach_instr_in_block_safe(block, ins) { + if (ins->type != TAG_ALU_4) continue; + if (ins->compact_branch) continue; + + if (ins->ssa_args.dest >= SSA_FIXED_MINIMUM) continue; + if (mir_is_live_after(ctx, block, ins, ins->ssa_args.dest)) continue; + + mir_remove_instruction(ins); + progress = true; + } + + return progress; +} |