panfrost: Add GenXML macros

From intel.

Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11785>

src/panfrost/lib/gen_macros.h

@@ -0,0 +1,72 @@
+/*
+ * Copyright ©2021 Collabora Ltd.
+ * Copyright © 2015 Intel 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.
+ */
+
+#ifndef GEN_MACROS_H
+#define GEN_MACROS_H
+
+/* Macros for handling per-gen compilation.
+ *
+ * The macro GENX() automatically suffixes whatever you give it with _vX
+ *
+ * You can do pseudo-runtime checks in your function such as
+ *
+ * if (PAN_ARCH == 4) {
+ *    // Do something
+ * }
+ *
+ * The contents of the if statement must be valid regardless of gen, but
+ * the if will get compiled away on everything except first-generation Midgard.
+ *
+ * For places where you really do have a compile-time conflict, you can
+ * use preprocessor logic:
+ *
+ * #if (PAN_ARCH == 75)
+ *    // Do something
+ * #endif
+ *
+ * However, it is strongly recommended that the former be used whenever
+ * possible.
+ */
+
+/* Base macro defined on the command line.  If we don't have this, we can't
+ * do anything.
+ */
+#ifndef PAN_ARCH
+#  error "The PAN_ARCH macro must be defined"
+#endif
+
+/* Suffixing macros */
+#if (PAN_ARCH == 4)
+#  define GENX(X) X##_v4
+#elif (PAN_ARCH == 5)
+#  define GENX(X) X##_v5
+#elif (PAN_ARCH == 6)
+#  define GENX(X) X##_v6
+#elif (PAN_ARCH == 7)
+#  define GENX(X) X##_v7
+#else
+#  error "Need to add suffixing macro for this architecture"
+#endif
+
+#endif /* GEN_MACROS_H */