diff --git a/c/flisp.c b/c/flisp.c
index fa1d782..6f74317 100644
--- a/c/flisp.c
+++ b/c/flisp.c
@@ -924,6 +924,79 @@ no_kw:
     return nargs;
 }
 
+
+#if defined(__amd64__) || defined(_M_AMD64)
+#define ARCH_X86_64
+#define __CPU__ 686
+#elif defined(_M_IX86)  // msvs, intel, digital mars, watcom
+#if !defined(__386__)
+#error "unsupported target: 16-bit x86"
+#endif
+#define ARCH_X86
+#define __CPU__ (_M_IX86 + 86)
+#elif defined(__i686__)  // gnu c
+#define ARCH_X86
+#define __CPU__ 686
+#elif defined(__i586__)  // gnu c
+#define ARCH_X86
+#define __CPU__ 586
+#elif defined(__i486__)  // gnu c
+#define ARCH_X86
+#define __CPU__ 486
+#elif defined(__i386__)  // gnu c
+#define ARCH_X86
+#define __CPU__ 386
+#else
+#error "unknown architecture"
+#endif
+
+#ifdef ARCH_X86_64
+#define LEGACY_REGS "=Q"
+#else
+#define LEGACY_REGS "=q"
+#endif
+
+#if !defined(__INTEL_COMPILER) && (defined(ARCH_X86) || defined(ARCH_X86_64))
+static uint16_t ByteSwap16(uint16_t x)
+{
+    __asm("xchgb %b0,%h0" : LEGACY_REGS(x) : "0"(x));
+    return x;
+}
+#define bswap_16(x) ByteSwap16(x)
+
+static uint32_t ByteSwap32(uint32_t x)
+{
+#if __CPU__ > 386
+    __asm("bswap        %0"
+          : "=r"(x)
+          :
+#else
+    __asm("xchgb        %b0,%h0\n"
+          "     rorl    $16,%0\n"
+          "     xchgb   %b0,%h0"
+          : LEGACY_REGS(x)
+          :
+#endif
+          "0"(x));
+    return x;
+}
+
+#define bswap_32(x) ByteSwap32(x)
+
+#else
+
+#define bswap_16(x) (((x)&0x00ff) << 8 | ((x)&0xff00) >> 8)
+
+#ifdef __INTEL_COMPILER
+#define bswap_32(x) _bswap(x)
+#else
+#define bswap_32(x)                                       \
+    ((((x)&0xff000000) >> 24) | (((x)&0x00ff0000) >> 8) | \
+     (((x)&0x0000ff00) << 8) | (((x)&0x000000ff) << 24))
+#endif
+
+#endif
+
 #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
 #define GET_INT32(a)                                             \
     ((int32_t)((((int32_t)a[0]) << 0) | (((int32_t)a[1]) << 8) | \
diff --git a/c/utils.h b/c/utils.h
index 639e6ae..df7ded2 100644
--- a/c/utils.h
+++ b/c/utils.h
@@ -1,75 +1,3 @@
-#if defined(__amd64__) || defined(_M_AMD64)
-#define ARCH_X86_64
-#define __CPU__ 686
-#elif defined(_M_IX86)  // msvs, intel, digital mars, watcom
-#if !defined(__386__)
-#error "unsupported target: 16-bit x86"
-#endif
-#define ARCH_X86
-#define __CPU__ (_M_IX86 + 86)
-#elif defined(__i686__)  // gnu c
-#define ARCH_X86
-#define __CPU__ 686
-#elif defined(__i586__)  // gnu c
-#define ARCH_X86
-#define __CPU__ 586
-#elif defined(__i486__)  // gnu c
-#define ARCH_X86
-#define __CPU__ 486
-#elif defined(__i386__)  // gnu c
-#define ARCH_X86
-#define __CPU__ 386
-#else
-#error "unknown architecture"
-#endif
-
 char *uint2str(char *dest, size_t len, uint64_t num, uint32_t base);
 int str2int(char *str, size_t len, int64_t *res, uint32_t base);
 int isdigit_base(char c, int base);
-
-#ifdef ARCH_X86_64
-#define LEGACY_REGS "=Q"
-#else
-#define LEGACY_REGS "=q"
-#endif
-
-#if !defined(__INTEL_COMPILER) && (defined(ARCH_X86) || defined(ARCH_X86_64))
-static uint16_t ByteSwap16(uint16_t x)
-{
-    __asm("xchgb %b0,%h0" : LEGACY_REGS(x) : "0"(x));
-    return x;
-}
-#define bswap_16(x) ByteSwap16(x)
-
-static uint32_t ByteSwap32(uint32_t x)
-{
-#if __CPU__ > 386
-    __asm("bswap        %0"
-          : "=r"(x)
-          :
-#else
-    __asm("xchgb        %b0,%h0\n"
-          "     rorl    $16,%0\n"
-          "     xchgb   %b0,%h0"
-          : LEGACY_REGS(x)
-          :
-#endif
-          "0"(x));
-    return x;
-}
-
-#define bswap_32(x) ByteSwap32(x)
-
-#else
-
-#define bswap_16(x) (((x)&0x00ff) << 8 | ((x)&0xff00) >> 8)
-
-#ifdef __INTEL_COMPILER
-#define bswap_32(x) _bswap(x)
-#else
-#define bswap_32(x)                                       \
-    ((((x)&0xff000000) >> 24) | (((x)&0x00ff0000) >> 8) | \
-     (((x)&0x0000ff00) << 8) | (((x)&0x000000ff) << 24))
-#endif
-
-#endif