Make numerous improvements

- Python static hello world now 1.8mb
- Python static fully loaded now 10mb
- Python HTTPS client now uses MbedTLS
- Python REPL now completes import stmts
- Increase stack size for Python for now
- Begin synthesizing posixpath and ntpath
- Restore Python \N{UNICODE NAME} support
- Restore Python NFKD symbol normalization
- Add optimized code path for Intel SHA-NI
- Get more Python unit tests passing faster
- Get Python help() pagination working on NT
- Python hashlib now supports MbedTLS PBKDF2
- Make memcpy/memmove/memcmp/bcmp/etc. faster
- Add Mersenne Twister and Vigna to LIBC_RAND
- Provide privileged __printf() for error code
- Fix zipos opendir() so that it reports ENOTDIR
- Add basic chmod() implementation for Windows NT
- Add Cosmo's best functions to Python cosmo module
- Pin function trace indent depth to that of caller
- Show memory diagram on invalid access in MODE=dbg
- Differentiate stack overflow on crash in MODE=dbg
- Add stb_truetype and tools for analyzing font files
- Upgrade to UNICODE 13 and reduce its binary footprint
- COMPILE.COM now logs resource usage of build commands
- Start implementing basic poll() support on bare metal
- Set getauxval(AT_EXECFN) to GetModuleFileName() on NT
- Add descriptions to strerror() in non-TINY build modes
- Add COUNTBRANCH() macro to help with micro-optimizations
- Make error / backtrace / asan / memory code more unbreakable
- Add fast perfect C implementation of μ-Law and a-Law audio codecs
- Make strtol() functions consistent with other libc implementations
- Improve Linenoise implementation (see also github.com/jart/bestline)
- COMPILE.COM now suppresses stdout/stderr of successful build commands

libc/testlib/ezbenchcontrol.c

@@ -16,9 +16,31 @@
 │ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
-#include "libc/testlib/bench.h"
+#include "libc/stdio/stdio.h"
+#include "libc/testlib/ezbench.h"
 #include "libc/testlib/testlib.h"
 
-uint64_t __testlib_ezbenchcontrol(void) {
-  return BENCHLOOP(__startbench, __endbench, 128, donothing, (void)0);
+static bool once;
+static int64_t g_ezbenchcontrol;
+
+int64_t __testlib_ezbenchcontrol(void) {
+  if (!once) {
+    int Core, Tries, Interrupts;
+    Tries = 0;
+    do {
+      __testlib_yield();
+      Core = __testlib_getcore();
+      Interrupts = __testlib_getinterrupts();
+      g_ezbenchcontrol =
+          BENCHLOOP(__startbench, __endbench, 128, donothing, (void)0);
+    } while (++Tries < 10 && (__testlib_getcore() != Core &&
+                              __testlib_getinterrupts() > Interrupts));
+    if (Tries == 10) {
+      fputs("warning: failed to accurately benchmark control\n", stderr);
+    }
+    fprintf(stderr, "will subtract benchmark overhead of %ld cycles\n\n",
+            g_ezbenchcontrol);
+    once = true;
+  }
+  return g_ezbenchcontrol;
 }