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src/panfrost/compiler/bifrost/bi_quirks.h

@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2019-2020 Collabora, Ltd.
+ * SPDX-License-Identifier: MIT
+ */
+
+#ifndef __BI_QUIRKS_H
+#define __BI_QUIRKS_H
+
+#include "panfrost/model/pan_model.h"
+
+/* Model-specific quirks requiring compiler workarounds/etc. Quirks
+ * may be errata requiring a workaround, or features. We're trying to be
+ * quirk-positive here; quirky is the best! */
+
+/* Whether this GPU lacks support for fp32 transcendentals, requiring backend
+ * lowering to low-precision lookup tables and polynomial approximation */
+
+#define BIFROST_NO_FP32_TRANSCENDENTALS (1 << 0)
+
+/* Whether this GPU lacks support for the full form of the CLPER instruction.
+ * These GPUs use a simple encoding of CLPER that does not support
+ * inactive_result, subgroup_size, or lane_op. Using those features requires
+ * lowering to additional ALU instructions. The encoding forces inactive_result
+ * = zero, subgroup_size = subgroup4, and lane_op = none. */
+
+#define BIFROST_LIMITED_CLPER (1 << 1)
+
+static inline unsigned
+bifrost_get_quirks(uint64_t gpu_id)
+{
+   unsigned arch_maj_min =
+      (PAN_ARCH_MAJOR(gpu_id) << 4) | PAN_ARCH_MINOR(gpu_id);
+   switch (arch_maj_min) {
+   case 0x60: /* G71 */
+      return BIFROST_NO_FP32_TRANSCENDENTALS | BIFROST_LIMITED_CLPER;
+   case 0x62: /* G72 */
+   case 0x70: /* G31 */
+      return BIFROST_LIMITED_CLPER;
+   default:
+      return 0;
+   }
+}
+
+#endif