Implemented SIMD sqrt.

tests/math_bench.cpp

@@ -0,0 +1,71 @@
+/*
+ * Copyright 2010-2018 Branimir Karadzic. All rights reserved.
+ * License: https://github.com/bkaradzic/bx#license-bsd-2-clause
+ */
+
+#include <bx/math.h>
+#include <bx/timer.h>
+#include <bx/file.h>
+
+#include <math.h>
+
+void math_bench()
+{
+	bx::WriterI* writer = bx::getStdOut();
+	bx::writePrintf(writer, "Math bench\n\n");
+
+	float result = 0.0f;
+	float max = 1389.0f;
+
+	{
+		int64_t elapsed = -bx::getHPCounter();
+
+		result = 0.0f;
+		for (float xx = 0.0f; xx < max; xx += 0.1f)
+		{
+			result += ::sqrtf(xx);
+		}
+
+		elapsed += bx::getHPCounter();
+		bx::writePrintf(writer, "     ::sqrtf: %15f, %f\n", double(elapsed), result);
+	}
+
+	{
+		int64_t elapsed = -bx::getHPCounter();
+
+		result = 0.0f;
+		for (float xx = 0.0f; xx < max; xx += 0.1f)
+		{
+			result += bx::sqrtRef(xx);
+		}
+
+		elapsed += bx::getHPCounter();
+		bx::writePrintf(writer, " bx::sqrtRef: %15f, %f\n", double(elapsed), result);
+	}
+
+	{
+		int64_t elapsed = -bx::getHPCounter();
+
+		result = 0.0f;
+		for (float xx = 0.0f; xx < max; xx += 0.1f)
+		{
+			result += bx::sqrtRef(xx);
+		}
+
+		elapsed += bx::getHPCounter();
+		bx::writePrintf(writer, "bx::sqrtSimd: %15f, %f\n", double(elapsed), result);
+	}
+
+	{
+		int64_t elapsed = -bx::getHPCounter();
+
+		result = 0.0f;
+		for (float xx = 0.0f; xx < max; xx += 0.1f)
+		{
+			result += bx::sqrt(xx);
+		}
+
+		elapsed += bx::getHPCounter();
+		bx::writePrintf(writer, "    bx::sqrt: %15f, %f\n", double(elapsed), result);
+	}
+}