Initial import

libc/testlib/bench.h

@@ -0,0 +1,29 @@
+#ifndef COSMOPOLITAN_LIBC_BENCH_H_
+#define COSMOPOLITAN_LIBC_BENCH_H_
+#include "libc/bits/safemacros.h"
+#include "libc/nexgen32e/bench.h"
+#if !(__ASSEMBLER__ + __LINKER__ + 0)
+COSMOPOLITAN_C_START_
+
+/**
+ * @fileoverview Microbenchmarking tools.
+ */
+
+#define BENCHLOOP(START, STOP, N, INIT, EXPR)                          \
+  ({                                                                   \
+    int Iter, Count;                                                   \
+    long double Average, Sample, Time1, Time2;                         \
+    for (Average = 1.0, Iter = 1, Count = (N); Iter < Count; ++Iter) { \
+      INIT;                                                            \
+      Time1 = START();                                                 \
+      EXPR;                                                            \
+      Time2 = STOP();                                                  \
+      Sample = Time2 - Time1;                                          \
+      Average += (Sample - Average) / Iter;                            \
+    }                                                                  \
+    Average;                                                           \
+  })
+
+COSMOPOLITAN_C_END_
+#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
+#endif /* COSMOPOLITAN_LIBC_BENCH_H_ */