better fast inv sqrt

sebseb7 · Dec 13, 2012 · 4340601 · 4340601
1 parent 3c966b3
commit 4340601
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/fastsqrt_version2 b/fastsqrt_version2
@@ -0,0 +1,5 @@
+float InvSqrt(float x){
+	uint32_t i = 0x5F1F1412 - (*(uint32_t*)&x >> 1);
+	float tmp = *(float*)&i;
+	return tmp * (1.69000231f - 0.714158168f * x * tmp * tmp);
+}