now version controlled.

1 files changed, 61 insertions, 0 deletions

diff --git a/structvsarray.c b/structvsarray.c
new file mode 100644
index 0000000..2f2ddaa
--- /dev/null
+++ b/structvsarray.c
@@ -0,0 +1,61 @@
+#include <u.h>
+#include <libc.h>
+
+enum {
+	Ts,
+	Tp,
+	Ta,
+	Tend
+};
+
+typedef struct Vec Vec;
+struct Vec {
+	double x, y, z;
+};
+
+typedef double Veca[3];
+
+vlong t[Tend], t0;
+
+Vec
+addvec(Vec a, Vec b)
+{
+	return (Vec){a.x+b.x, a.y+b.y, a.z+b.z};
+}
+
+void
+addvecp(Vec *a, Vec *b)
+{
+	a->x += b->x;
+	a->y += b->y;
+	a->z += b->z;
+}
+
+void
+addveca(Veca a, Veca b)
+{
+	a[0] += b[0];
+	a[1] += b[1];
+	a[2] += b[2];
+}
+
+void
+main()
+{
+	Vec a = {5, 2, 19};
+	Vec b = {213, 30, -12};
+	Veca aa = {2, 9, -1};
+	Veca ab = {-10, 20, 30};
+
+	t0 = nsec();
+	a = addvec(a, b);
+	t[Ts] = nsec()-t0;
+	t0 = nsec();
+	addvecp(&a, &b);
+	t[Tp] = nsec()-t0;
+	t0 = nsec();
+	addveca(aa, ab);
+	t[Ta] = nsec()-t0;
+	print("struct\t%lldns\nstruct*\t%lldns\narray\t%lldns\n", t[Ts], t[Tp], t[Ta]);
+	exits(nil);
+}