Make small fixes and oops ran clang-format on dtoa

libc/bits/popcnt.h

@@ -0,0 +1,24 @@
+#ifndef COSMOPOLITAN_LIBC_BITS_POPCNT_H_
+#define COSMOPOLITAN_LIBC_BITS_POPCNT_H_
+#include "libc/nexgen32e/x86feature.h"
+#if !(__ASSEMBLER__ + __LINKER__ + 0)
+COSMOPOLITAN_C_START_
+
+unsigned long popcnt(unsigned long) pureconst;
+
+#if defined(__GNUC__) && !defined(__STRICT_ANSI__)
+#define popcnt(X)                                         \
+  (isconstant(X) ? __builtin_popcount(X) : ({             \
+    unsigned long Res, Pop = (X);                         \
+    if (X86_HAVE(POPCNT)) {                               \
+      asm("popcnt\t%1,%0" : "=r"(Res) : "r"(Pop) : "cc"); \
+    } else {                                              \
+      Res = (popcnt)(Pop);                                \
+    }                                                     \
+    Res;                                                  \
+  }))
+#endif /* GNUC && !ANSI */
+
+COSMOPOLITAN_C_END_
+#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
+#endif /* COSMOPOLITAN_LIBC_BITS_POPCNT_H_ */