radv/ac: add initial pre-pass for shader info gathering

There is some radv specific info we need to gather from shaders
before we get into converting nir->llvm, so we can make
better decisions especially around user sgpr allocation.

This is just an initial placeholder to gather if sample positions
are required in the frag shader.

Reviewed-by: Bas Nieuwenhuizen <[email protected]>
Signed-off-by: Dave Airlie <[email protected]>

1 files changed, 61 insertions, 0 deletions

diff --git a/src/amd/common/ac_shader_info.c b/src/amd/common/ac_shader_info.c
new file mode 100644
index 00000000000..85252fea146
--- /dev/null
+++ b/src/amd/common/ac_shader_info.c
@@ -0,0 +1,61 @@
+/*
+ * Copyright © 2017 Red Hat
+ *
+ * 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"
+#include "ac_shader_info.h"
+#include "ac_nir_to_llvm.h"
+static void
+gather_intrinsic_info(nir_intrinsic_instr *instr, struct ac_shader_info *info)
+{
+	switch (instr->intrinsic) {
+	case nir_intrinsic_interp_var_at_sample:
+		info->ps.needs_sample_positions = true;
+		break;
+	default:
+		break;
+	}
+}
+
+static void
+gather_info_block(nir_block *block, struct ac_shader_info *info)
+{
+	nir_foreach_instr(instr, block) {
+		switch (instr->type) {
+		case nir_instr_type_intrinsic:
+			gather_intrinsic_info(nir_instr_as_intrinsic(instr), info);
+			break;
+		default:
+			break;
+		}
+	}
+}
+
+void
+ac_nir_shader_info_pass(struct nir_shader *nir,
+			const struct ac_nir_compiler_options *options,
+			struct ac_shader_info *info)
+{
+	struct nir_function *func = (struct nir_function *)exec_list_get_head(&nir->functions);
+	nir_foreach_block(block, func->impl) {
+		gather_info_block(block, info);
+	}
+}