1 files changed, 56 insertions, 0 deletions
diff --git a/gfx/skia/skia/src/utils/SkCycles.h b/gfx/skia/skia/src/utils/SkCycles.h
new file mode 100644
index 0000000000..93385a52e1
--- /dev/null
+++ b/gfx/skia/skia/src/utils/SkCycles.h
@@ -0,0 +1,56 @@
+/*
+ * Copyright 2022 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * This is an experimental (and probably temporary) solution that allows
+ * to compare performance SkVM blitters vs RasterPipeline blitters.
+ * In addition to measuring performance (which is questionable) it also produces
+ * other counts (pixels, scanlines) and more detailed traces that
+ * can explain the current results (SkVM is slower) and help improve it.
+ * The entire code is hidden under build flag skia_compare_vm_vs_rp=true
+ * and will not appear at all without it.
+ */
+#ifndef SkCycles_DEFINED
+#define SkCycles_DEFINED
+#include <cstdint>
+#include <x86intrin.h>
+class SkCycles {
+public:
+    static uint64_t Now() {
+        #ifndef SKIA_COMPARE_VM_VS_RP
+        {
+            return 0ul;
+        }
+        #elif defined(SK_BUILD_FOR_WIN)
+        {
+            return 0ul;
+        }
+        #elif defined(SK_BUILD_FOR_IOS)
+        {
+            return 0ul;
+        }
+        #elif defined(SK_BUILD_FOR_ANDROID)
+        {
+            return 0ul;
+        }
+        #elif defined(SK_CPU_X86)
+        {
+            unsigned aux;
+            return __rdtscp(&aux);
+        }
+        #elif defined(SK_CPU_ARM64)
+        {
+            int64_t cycles;
+            asm volatile("mrs %0, cntvct_el0" : "=r"(cycles));
+            return cycles;
+        }
+        #else
+        {
+            return 0ul;
+        }
+        #endif
+    }
+};
+#endif  // SkCycles_DEFINED