pan/midgard: Introduce invert field

This will enable us to fuse inverts in various ways. Marginal hurt:

total instructions in shared programs: 3610 -> 3611 (0.03%)
instructions in affected programs: 67 -> 68 (1.49%)
helped: 0
HURT: 1

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

1 files changed, 64 insertions, 0 deletions

diff --git a/src/panfrost/midgard/midgard_opt_invert.c b/src/panfrost/midgard/midgard_opt_invert.c
new file mode 100644
index 00000000000..f5c10981ccb
--- /dev/null
+++ b/src/panfrost/midgard/midgard_opt_invert.c
@@ -0,0 +1,64 @@
+/*
+ * 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"
+
+/* Lowers the invert field on instructions to a dedicated inot (inor)
+ * instruction instead, as invert is not always supported natively by the
+ * hardware */
+
+void
+midgard_lower_invert(compiler_context *ctx, midgard_block *block)
+{
+        mir_foreach_instr_in_block_safe(block, ins) {
+                if (ins->type != TAG_ALU_4) continue;
+                if (!ins->invert) continue;
+
+                unsigned temp = make_compiler_temp(ctx);
+
+                midgard_instruction not = {
+                        .type = TAG_ALU_4,
+                        .mask = ins->mask,
+                        .ssa_args = {
+                                .src0 = temp,
+                                .src1 = 0,
+                                .dest = ins->ssa_args.dest,
+                                .inline_constant = true
+                        },
+                        .alu = {
+                                .op = midgard_alu_op_inor,
+                                /* TODO: i16 */
+                                .reg_mode = midgard_reg_mode_32,
+                                .dest_override = midgard_dest_override_none,
+                                .outmod = midgard_outmod_int_wrap,
+                                .src1 = vector_alu_srco_unsigned(blank_alu_src),
+                                .src2 = vector_alu_srco_unsigned(zero_alu_src)
+                        },
+                };
+
+                ins->ssa_args.dest = temp;
+                ins->invert = false;
+                mir_insert_instruction_before(mir_next_op(ins), not);
+        }
+}