pan/midgard: Move copy propagation into its own file

We also expose some utilities it uses as general MIR helpers.

Signed-off-by: Alyssa Rosenzweig <[email protected]>

5 files changed, 120 insertions, 83 deletions

diff --git a/src/panfrost/midgard/compiler.h b/src/panfrost/midgard/compiler.h
index 50e1846f893..326e351f7ff 100644
--- a/src/panfrost/midgard/compiler.h
+++ b/src/panfrost/midgard/compiler.h
@@ -381,6 +381,8 @@ void mir_print_instruction(midgard_instruction *ins);
 void mir_print_bundle(midgard_bundle *ctx);
 void mir_print_block(midgard_block *block);
 void mir_print_shader(compiler_context *ctx);
+bool mir_nontrivial_source2_mod(midgard_instruction *ins);
+bool mir_nontrivial_mod(midgard_vector_alu_src src, bool is_int, unsigned mask);
 
 /* MIR goodies */
 
@@ -480,4 +482,8 @@ nir_undef_to_zero(nir_shader *shader);
 void
 nir_clamp_psiz(nir_shader *shader, float min_size, float max_size);
 
+/* Optimizations */
+
+bool midgard_opt_copy_prop(compiler_context *ctx, midgard_block *block);
+
 #endif
diff --git a/src/panfrost/midgard/meson.build b/src/panfrost/midgard/meson.build
index b467f835032..ead81cf2a5b 100644
--- a/src/panfrost/midgard/meson.build
+++ b/src/panfrost/midgard/meson.build
@@ -30,6 +30,7 @@ libpanfrost_midgard_files = files(
   'midgard_liveness.c',
   'midgard_ops.c',
   'mir_promote_uniforms.c',
+  'midgard_opt_copy_prop.c',
   'cppwrap.cpp',
   'disassemble.c',
 )
diff --git a/src/panfrost/midgard/midgard_compile.c b/src/panfrost/midgard/midgard_compile.c
index 86d97e37095..7fa9c4b598f 100644
--- a/src/panfrost/midgard/midgard_compile.c
+++ b/src/panfrost/midgard/midgard_compile.c
@@ -2012,89 +2012,6 @@ midgard_opt_cull_dead_branch(compiler_context *ctx, midgard_block *block)
         }
 }
 
-static bool
-mir_nontrivial_mod(midgard_vector_alu_src src, bool is_int, unsigned mask)
-{
-        /* abs or neg */
-        if (!is_int && src.mod) return true;
-
-        /* Other int mods don't matter in isolation */
-        if (is_int && src.mod == midgard_int_shift) return true;
-
-        /* size-conversion */
-        if (src.half) return true;
-
-        /* swizzle */
-        for (unsigned c = 0; c < 4; ++c) {
-                if (!(mask & (1 << c))) continue;
-                if (((src.swizzle >> (2*c)) & 3) != c) return true;
-        }
-
-        return false;
-}
-
-static bool
-mir_nontrivial_source2_mod(midgard_instruction *ins)
-{
-        bool is_int = midgard_is_integer_op(ins->alu.op);
-
-        midgard_vector_alu_src src2 =
-                vector_alu_from_unsigned(ins->alu.src2);
-
-        return mir_nontrivial_mod(src2, is_int, ins->mask);
-}
-
-static bool
-mir_nontrivial_outmod(midgard_instruction *ins)
-{
-        bool is_int = midgard_is_integer_op(ins->alu.op);
-        unsigned mod = ins->alu.outmod;
-
-        /* Type conversion is a sort of outmod */
-        if (ins->alu.dest_override != midgard_dest_override_none)
-                return true;
-
-        if (is_int)
-                return mod != midgard_outmod_int_wrap;
-        else
-                return mod != midgard_outmod_none;
-}
-
-static bool
-midgard_opt_copy_prop(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 (!OP_IS_MOVE(ins->alu.op)) continue;
-
-                unsigned from = ins->ssa_args.src1;
-                unsigned to = ins->ssa_args.dest;
-
-                /* We only work on pure SSA */
-
-                if (to >= SSA_FIXED_MINIMUM) continue;
-                if (from >= SSA_FIXED_MINIMUM) continue;
-                if (to >= ctx->func->impl->ssa_alloc) continue;
-                if (from >= ctx->func->impl->ssa_alloc) continue;
-
-                /* Constant propagation is not handled here, either */
-                if (ins->ssa_args.inline_constant) continue;
-                if (ins->has_constants) continue;
-
-                if (mir_nontrivial_source2_mod(ins)) continue;
-                if (mir_nontrivial_outmod(ins)) continue;
-
-                /* We're clear -- rewrite */
-                mir_rewrite_index_src(ctx, to, from);
-                mir_remove_instruction(ins);
-                progress |= true;
-        }
-
-        return progress;
-}
-
 /* fmov.pos is an idiom for fpos. Propoagate the .pos up to the source, so then
  * the move can be propagated away entirely */
 
diff --git a/src/panfrost/midgard/midgard_opt_copy_prop.c b/src/panfrost/midgard/midgard_opt_copy_prop.c
new file mode 100644
index 00000000000..30fe1c7cb4f
--- /dev/null
+++ b/src/panfrost/midgard/midgard_opt_copy_prop.c
@@ -0,0 +1,78 @@
+/*
+ * 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"
+#include "midgard_ops.h"
+
+static bool
+mir_nontrivial_outmod(midgard_instruction *ins)
+{
+        bool is_int = midgard_is_integer_op(ins->alu.op);
+        unsigned mod = ins->alu.outmod;
+
+        /* Type conversion is a sort of outmod */
+        if (ins->alu.dest_override != midgard_dest_override_none)
+                return true;
+
+        if (is_int)
+                return mod != midgard_outmod_int_wrap;
+        else
+                return mod != midgard_outmod_none;
+}
+
+bool
+midgard_opt_copy_prop(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 (!OP_IS_MOVE(ins->alu.op)) continue;
+
+                unsigned from = ins->ssa_args.src1;
+                unsigned to = ins->ssa_args.dest;
+
+                /* We only work on pure SSA */
+
+                if (to >= SSA_FIXED_MINIMUM) continue;
+                if (from >= SSA_FIXED_MINIMUM) continue;
+                if (to >= ctx->func->impl->ssa_alloc) continue;
+                if (from >= ctx->func->impl->ssa_alloc) continue;
+
+                /* Constant propagation is not handled here, either */
+                if (ins->ssa_args.inline_constant) continue;
+                if (ins->has_constants) continue;
+
+                /* Modifier propagation is not handled here */
+                if (mir_nontrivial_source2_mod(ins)) continue;
+                if (mir_nontrivial_outmod(ins)) continue;
+
+                /* We're clear -- rewrite */
+                mir_rewrite_index_src(ctx, to, from);
+                mir_remove_instruction(ins);
+                progress |= true;
+        }
+
+        return progress;
+}
diff --git a/src/panfrost/midgard/mir.c b/src/panfrost/midgard/mir.c
index ea7c65110b4..03a47f44acb 100644
--- a/src/panfrost/midgard/mir.c
+++ b/src/panfrost/midgard/mir.c
@@ -22,6 +22,7 @@
  */
 
 #include "compiler.h"
+#include "midgard_ops.h"
 
 void mir_rewrite_index_src_single(midgard_instruction *ins, unsigned old, unsigned new)
 {
@@ -78,3 +79,37 @@ mir_single_use(compiler_context *ctx, unsigned value)
         return used_count <= 1;
 
 }
+
+bool
+mir_nontrivial_mod(midgard_vector_alu_src src, bool is_int, unsigned mask)
+{
+        /* abs or neg */
+        if (!is_int && src.mod) return true;
+
+        /* Other int mods don't matter in isolation */
+        if (is_int && src.mod == midgard_int_shift) return true;
+
+        /* size-conversion */
+        if (src.half) return true;
+
+        /* swizzle */
+        for (unsigned c = 0; c < 4; ++c) {
+                if (!(mask & (1 << c))) continue;
+                if (((src.swizzle >> (2*c)) & 3) != c) return true;
+        }
+
+        return false;
+}
+
+bool
+mir_nontrivial_source2_mod(midgard_instruction *ins)
+{
+        bool is_int = midgard_is_integer_op(ins->alu.op);
+
+        midgard_vector_alu_src src2 =
+                vector_alu_from_unsigned(ins->alu.src2);
+
+        return mir_nontrivial_mod(src2, is_int, ins->mask);
+}
+
+