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lima/gpir: kill dead writes to regs in DCE

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Writes to regs that are never read will confuse regalloc since they
are never live and don't conflict with any regs. Kill them to prevent
overwriting another live reg.

Reviewed-by: Andreas Baierl <ichgeh@imkreisrum.de>
Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4125>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4125>
This commit is contained in:
Vasily Khoruzhick 2020-03-09 19:34:43 -07:00 • committed by Marge Bot
parent 8c1bcc8555
commit b7d89476f1
3 changed files with 28 additions and 17 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

10
.gitlab-ci/deqp-lima-fails.txt
View file

@ -69,19 +69,9 @@ dEQP-GLES2.functional.shaders.functions.qualifiers.inout_lowp_int_vertex
dEQP-GLES2.functional.shaders.functions.qualifiers.out_highp_int_vertex
dEQP-GLES2.functional.shaders.functions.qualifiers.out_int_vertex
dEQP-GLES2.functional.shaders.functions.qualifiers.out_lowp_int_vertex
dEQP-GLES2.functional.shaders.indexing.matrix_subscript.mat3_dynamic_loop_write_static_loop_read_vertex
dEQP-GLES2.functional.shaders.indexing.matrix_subscript.mat3_dynamic_loop_write_static_read_vertex
dEQP-GLES2.functional.shaders.indexing.matrix_subscript.mat3_dynamic_write_dynamic_loop_read_vertex
dEQP-GLES2.functional.shaders.loops.do_while_constant_iterations.conditional_body_vertex
dEQP-GLES2.functional.shaders.loops.do_while_dynamic_iterations.vector_counter_fragment
dEQP-GLES2.functional.shaders.loops.do_while_uniform_iterations.conditional_body_vertex
dEQP-GLES2.functional.shaders.loops.do_while_uniform_iterations.nested_tricky_dataflow_2_vertex
dEQP-GLES2.functional.shaders.loops.for_dynamic_iterations.vector_counter_fragment
dEQP-GLES2.functional.shaders.loops.while_constant_iterations.compound_statement_vertex
dEQP-GLES2.functional.shaders.loops.while_constant_iterations.sequence_statement_vertex
dEQP-GLES2.functional.shaders.loops.while_dynamic_iterations.nested_sequence_vertex
dEQP-GLES2.functional.shaders.loops.while_dynamic_iterations.vector_counter_fragment
dEQP-GLES2.functional.shaders.loops.while_uniform_iterations.nested_vertex
dEQP-GLES2.functional.shaders.operator.binary_operator.sub_assign_effect.highp_int_vertex
dEQP-GLES2.functional.shaders.operator.binary_operator.sub_assign_effect.highp_ivec2_int_vertex
dEQP-GLES2.functional.shaders.operator.binary_operator.sub_assign_effect.highp_ivec2_vertex

7
.gitlab-ci/deqp-lima-skips.txt
View file

@ -26,18 +26,11 @@ dEQP-GLES2.functional.shaders.random.all_features.fragment.55
dEQP-GLES2.functional.shaders.random.trigonometric.fragment.1
dEQP-GLES2.functional.shaders.random.trigonometric.fragment.69
# Driver bugs causing GPU errors
dEQP-GLES2.functional.shaders.loops.while_constant_iterations.nested_sequence_vertex
dEQP-GLES2.functional.shaders.loops.while_constant_iterations.conditional_body_vertex
dEQP-GLES2.functional.shaders.loops.while_uniform_iterations.conditional_continue_vertex
dEQP-GLES2.functional.shaders.loops.while_uniform_iterations.double_continue_vertex
# Hangs / OOM
dEQP-GLES2.functional.shaders.indexing.varying_array.vec4_dynamic_loop_write_static_read
dEQP-GLES2.functional.shaders.indexing.varying_array.vec4_dynamic_loop_write_dynamic_read
dEQP-GLES2.functional.shaders.indexing.varying_array.vec4_dynamic_loop_write_static_loop_read
dEQP-GLES2.functional.shaders.indexing.varying_array.vec4_dynamic_loop_write_dynamic_loop_read
dEQP-GLES2.functional.shaders.indexing.tmp_array.vec3_dynamic_loop_write_dynamic_read_vertex
dEQP-GLES2.functional.shaders.indexing.tmp_array.vec4_dynamic_loop_write_static_read_vertex
dEQP-GLES2.functional.shaders.indexing.tmp_array.vec4_dynamic_loop_write_dynamic_read_vertex

28
src/gallium/drivers/lima/ir/gp/optimize.c
View file

@ -171,6 +171,34 @@ dead_code_eliminate(gpir_compiler *comp)
}
}
}
/* Kill all the writes to regs that are never read. All the known
* instances of these are coming from the cycle-breaking register
* created in out-of-SSA. See resolve_parallel_copy() in nir_from_ssa.c
* Since we kill redundant movs when we translate nir into gpir, it
* results in this reg being written, but never read.
*/
BITSET_WORD *regs = rzalloc_array(comp, BITSET_WORD, comp->cur_reg);
list_for_each_entry(gpir_block, block, &comp->block_list, list) {
list_for_each_entry(gpir_node, node, &block->node_list, list) {
if (node->op != gpir_op_load_reg)
continue;
gpir_load_node *load = gpir_node_to_load(node);
BITSET_SET(regs, load->reg->index);
}
}
list_for_each_entry(gpir_block, block, &comp->block_list, list) {
list_for_each_entry_safe(gpir_node, node, &block->node_list, list) {
if (node->op != gpir_op_store_reg)
continue;
gpir_store_node *store = gpir_node_to_store(node);
if (!BITSET_TEST(regs, store->reg->index))
gpir_node_delete(node);
}
}
ralloc_free(regs);
}
bool