zfhmin microbenchmark

zfhmin_micro/zfhmin.c

@@ -0,0 +1,57 @@
+#include <math.h>
+#include <stdint.h>
+
+#define N 10
+
+static inline uint64_t read_cycles() {
+    uint64_t start;
+    asm volatile ("rdcycle %0" : "=r"(start));
+    return start;
+}
+
+int main() {
+  // fcvt.s.h
+
+  volatile float b;
+  volatile _Float16 d;
+  volatile double e;
+  volatile _Float16 g;
+
+  volatile _Float16 a = 3.0f;
+
+  read_cycles();
+  for (int i = 0; i < N; i++) {
+    b = (float) a;
+  }
+  read_cycles();
+
+  // fcvt.h.s
+
+  volatile float c = 3.0f;
+
+  read_cycles();
+  for (int i = 0; i < N; i++) {
+    d = (_Float16) c;
+  }
+  read_cycles();
+
+  // fcvt.d.h
+
+  read_cycles();
+  for (int i = 0; i < N; i++) {
+    double e = (double) a;
+  }
+  read_cycles();
+
+  // fcvt.h.d
+
+  volatile double f = 3.0f;
+
+  read_cycles();
+  for (int i = 0; i < N; i++) {
+    g = (_Float16) f;
+  }
+  read_cycles();
+
+  return 0;
+}