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6772a17acc
This pass detects induction variables and calculates the trip count of loops to be used for loop unrolling. V2: Rebase, adapt to removal of function overloads V3: (Timothy Arceri) - don't try to find trip count if loop terminator conditional is a phi - fix trip count for do-while loops - replace conditional type != alu assert with return - disable unrolling of loops with continues - multiple fixes to memory allocation, stop leaking and don't destroy structs we want to use for unrolling. - fix iteration count bugs when induction var not on RHS of condition - add FIXME for && conditions - calculate trip count for unsigned induction/limit vars V4: (Timothy Arceri) - count instructions in a loop - set the limiting_terminator even if we can't find the trip count for all terminators. This is needed for complex unrolling where we handle 2 terminators and the trip count is unknown for one of them. - restruct structs so we don't keep information not required after analysis and remove dead fields. - force unrolling in some cases as per the rules in the GLSL IR pass V5: (Timothy Arceri) - fix metadata mask value 0x10 vs 0x16 V6: (Timothy Arceri) - merge loop_variable and nir_loop_variable structs and lists suggested by Jason - remove induction var hash table and store pointer to induction information in the loop_variable suggested by Jason. - use lowercase list_addtail() suggested by Jason. - tidy up init_loop_block() as per Jasons suggestions. - replace switch with nir_op_infos[alu->op].num_inputs == 2 in is_var_basic_induction_var() as suggested by Jason. - use nir_block_last_instr() in and rename foreach_cf_node_ex_loop() as suggested by Jason. - fix else check for is_trivial_loop_terminator() as per Connors suggetions. - simplify offset for induction valiables incremented before the exit conditions is checked. - replace nir_op_isub check with assert() as it should have been lowered away. V7: (Timothy Arceri) - use rzalloc() on nir_loop struct creation. Worked previously because ralloc() was broken and always zeroed the struct. - fix cf_node_find_loop_jumps() to find jumps when loops contain nested if statements. Code is tidier as a result. V8: (Timothy Arceri) - move is_trivial_loop_terminator() to nir.h so we can use it to assert is the loop unroll pass - fix analysis to not bail when looking for terminator when the break is in the else rather then the if - added new loop terminator fields: break_block, continue_from_block and continue_from_then so we don't have to gather these when doing unrolling. - get correct array length when forcing unrolling of variables indexed arrays that are the same size as the iteration count - add support for induction variables of type float - update trival loop terminator check to allow an if containing instructions as long as both branches contain only a single block. V9: (Timothy) - bunch of tidy ups and simplifications suggested by Jason. - rewrote trivial terminator detection, now the only restriction is there must be no nested jumps, anything else goes. - rewrote the iteration test to use nir_eval_const_opcode(). - count instruction properly even when forcing an unroll. - bunch of other tidy ups and simplifications. V10: (Timothy) - some trivial tidy ups suggested by Jason. - conditional fix for break inside continue branch by Jason. Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
96 lines
3 KiB
C
96 lines
3 KiB
C
/*
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* Copyright © 2014 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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* Authors:
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* Jason Ekstrand (jason@jlekstrand.net)
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*/
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#include "nir.h"
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/*
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* Handles management of the metadata.
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*/
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void
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nir_metadata_require(nir_function_impl *impl, nir_metadata required, ...)
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{
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#define NEEDS_UPDATE(X) ((required & ~impl->valid_metadata) & (X))
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if (NEEDS_UPDATE(nir_metadata_block_index))
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nir_index_blocks(impl);
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if (NEEDS_UPDATE(nir_metadata_dominance))
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nir_calc_dominance_impl(impl);
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if (NEEDS_UPDATE(nir_metadata_live_ssa_defs))
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nir_live_ssa_defs_impl(impl);
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if (NEEDS_UPDATE(nir_metadata_loop_analysis)) {
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va_list ap;
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va_start(ap, required);
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nir_loop_analyze_impl(impl, va_arg(ap, nir_variable_mode));
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va_end(ap);
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}
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#undef NEEDS_UPDATE
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impl->valid_metadata |= required;
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}
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void
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nir_metadata_preserve(nir_function_impl *impl, nir_metadata preserved)
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{
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impl->valid_metadata &= preserved;
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}
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#ifdef DEBUG
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/**
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* Make sure passes properly invalidate metadata (part 1).
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*
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* Call this before running a pass to set a bogus metadata flag, which will
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* only be preserved if the pass forgets to call nir_metadata_preserve().
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*/
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void
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nir_metadata_set_validation_flag(nir_shader *shader)
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{
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nir_foreach_function(function, shader) {
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if (function->impl) {
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function->impl->valid_metadata |= nir_metadata_not_properly_reset;
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}
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}
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}
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/**
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* Make sure passes properly invalidate metadata (part 2).
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*
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* Call this after a pass makes progress to verify that the bogus metadata set by
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* the earlier function was properly thrown away. Note that passes may not call
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* nir_metadata_preserve() if they don't actually make any changes at all.
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*/
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void
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nir_metadata_check_validation_flag(nir_shader *shader)
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{
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nir_foreach_function(function, shader) {
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if (function->impl) {
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assert(!(function->impl->valid_metadata &
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nir_metadata_not_properly_reset));
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}
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}
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}
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#endif
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