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authorSamuel Pitoiset <[email protected]>2018-01-29 17:19:00 +0100
committerSamuel Pitoiset <[email protected]>2018-02-06 23:08:39 +0100
commite68562b94b79f5ce17f5804f8d7308faf57bd3f0 (patch)
treeb3900a4674aa485ed0605c3ab96093149f2ba5f0 /src/compiler
parente2ea9e11910a10ae10d6491d913ab1d57f97a0d4 (diff)
nir: add nir_opt_shrink_load pass
This is a very simple pass that just shrinks load_push_constant intrinsics when some components are unused. For now, it can just shrink vec4 to vec3, vec3 to vec2 and so on. Signed-off-by: Samuel Pitoiset <[email protected]> Reviewed-by: Bas Nieuwenhuizen <[email protected]>
Diffstat (limited to 'src/compiler')
-rw-r--r--src/compiler/Makefile.sources1
-rw-r--r--src/compiler/nir/meson.build1
-rw-r--r--src/compiler/nir/nir.h2
-rw-r--r--src/compiler/nir/nir_opt_shrink_load_constant.c67
4 files changed, 71 insertions, 0 deletions
diff --git a/src/compiler/Makefile.sources b/src/compiler/Makefile.sources
index d3f746f5f94..84dbc26d198 100644
--- a/src/compiler/Makefile.sources
+++ b/src/compiler/Makefile.sources
@@ -268,6 +268,7 @@ NIR_FILES = \
nir/nir_opt_move_comparisons.c \
nir/nir_opt_peephole_select.c \
nir/nir_opt_remove_phis.c \
+ nir/nir_opt_shrink_load.c \
nir/nir_opt_trivial_continues.c \
nir/nir_opt_undef.c \
nir/nir_phi_builder.c \
diff --git a/src/compiler/nir/meson.build b/src/compiler/nir/meson.build
index b5f27ad667b..859a0c1e62d 100644
--- a/src/compiler/nir/meson.build
+++ b/src/compiler/nir/meson.build
@@ -162,6 +162,7 @@ files_libnir = files(
'nir_opt_move_comparisons.c',
'nir_opt_peephole_select.c',
'nir_opt_remove_phis.c',
+ 'nir_opt_shrink_load.c',
'nir_opt_trivial_continues.c',
'nir_opt_undef.c',
'nir_phi_builder.c',
diff --git a/src/compiler/nir/nir.h b/src/compiler/nir/nir.h
index 9ab2769e067..5ea8c9926b9 100644
--- a/src/compiler/nir/nir.h
+++ b/src/compiler/nir/nir.h
@@ -2770,6 +2770,8 @@ bool nir_opt_peephole_select(nir_shader *shader, unsigned limit);
bool nir_opt_remove_phis(nir_shader *shader);
+bool nir_opt_shrink_load(nir_shader *shader);
+
bool nir_opt_trivial_continues(nir_shader *shader);
bool nir_opt_undef(nir_shader *shader);
diff --git a/src/compiler/nir/nir_opt_shrink_load_constant.c b/src/compiler/nir/nir_opt_shrink_load_constant.c
new file mode 100644
index 00000000000..f97b7f9b67f
--- /dev/null
+++ b/src/compiler/nir/nir_opt_shrink_load_constant.c
@@ -0,0 +1,67 @@
+/*
+ * Copyright © 2018 Valve Corporation
+ *
+ * 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 "nir.h"
+
+static bool
+opt_shrink_load(nir_intrinsic_instr *instr)
+{
+ bool progress = false;
+
+ if (instr->intrinsic == nir_intrinsic_load_push_constant) {
+ unsigned mask = nir_ssa_def_components_read(&instr->dest.ssa);
+
+ if (instr->num_components > util_last_bit(mask)) {
+ instr->num_components = util_last_bit(mask);
+ instr->dest.ssa.num_components = instr->num_components;
+ progress = true;
+ }
+ }
+
+ return progress;
+}
+
+bool
+nir_opt_shrink_load(nir_shader *shader)
+{
+ bool progress = false;
+
+ nir_foreach_function(function, shader) {
+ if (!function->impl)
+ continue;
+
+ nir_foreach_block(block, function->impl) {
+ nir_foreach_instr(instr, block) {
+ if (instr->type != nir_instr_type_intrinsic)
+ continue;
+
+ progress |= opt_shrink_load(nir_instr_as_intrinsic(instr));
+ }
+ }
+
+ nir_metadata_preserve(function->impl, nir_metadata_block_index |
+ nir_metadata_dominance);
+ }
+
+ return progress;
+}