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

third_party/python/Modules/expat/xmlparse.c

@@ -1,8 +1,11 @@
 #include "libc/assert.h"
+#include "libc/bits/bits.h"
 #include "libc/calls/calls.h"
 #include "libc/calls/struct/timeval.h"
 #include "libc/errno.h"
 #include "libc/limits.h"
+#include "libc/nexgen32e/rdtsc.h"
+#include "libc/nexgen32e/x86feature.h"
 #include "libc/rand/rand.h"
 #include "libc/runtime/runtime.h"
 #include "libc/stdio/stdio.h"
@@ -593,11 +596,30 @@ static unsigned long get_hash_secret_salt(XML_Parser parser) {
   return parser->m_hash_secret_salt;
 }
 
+static uint64_t getsome(void) {
+  int i;
+  char cf;
+  uint64_t x;
+  if (X86_HAVE(RDRND)) {
+    for (i = 0; i < 10; ++i) {
+      asm volatile(CFLAG_ASM("rdrand\t%1")
+                   : CFLAG_CONSTRAINT(cf), "=r"(x)
+                   : /* no inputs */
+                   : "cc");
+      if (cf) return x;
+      asm volatile("pause");
+    }
+  }
+  if (getrandom(&x, 8, 0) != 8) abort();
+  return x;
+}
+
 static XML_Bool /* only valid for root parser */
 startParsing(XML_Parser parser) {
   /* hash functions must be initialized before setContext() is called */
-  if (parser->m_hash_secret_salt == 0)
-    parser->m_hash_secret_salt = rand64();
+  if (!parser->m_hash_secret_salt) {
+    parser->m_hash_secret_salt = getsome();
+  }
   if (parser->m_ns) {
     /* implicit context only set for root parser, since child
        parsers (i.e. external entity parsers) will inherit it
@@ -2421,7 +2443,7 @@ static enum XML_Error doContent(XML_Parser parser, int startTagLevel,
           rawName = s + enc->minBytesPerChar * 2;
           len = XmlNameLength(enc, rawName);
           if (len != tag->rawNameLength ||
-              memcmp(tag->rawName, rawName, len) != 0) {
+              bcmp(tag->rawName, rawName, len)) {
             *eventPP = rawName;
             return XML_ERROR_TAG_MISMATCH;
           }