Move utility macros to their own file

so that hv_func is left with only logic relating to selecting
and configuring the hash function we use, not the macros our
hash functions use.

1 files changed, 81 insertions, 0 deletions

diff --git a/hv_macro.h b/hv_macro.h
new file mode 100644
index 0000000000..77a4c84896
--- /dev/null
+++ b/hv_macro.h
@@ -0,0 +1,81 @@
+#ifndef PERL_SEEN_HV_MACRO_H /* compile once */
+#define PERL_SEEN_HV_MACRO_H
+
+#if IVSIZE == 8
+#define CAN64BITHASH
+#endif
+
+/*-----------------------------------------------------------------------------
+ * Endianess, misalignment capabilities and util macros
+ *
+ * The following 3 macros are defined in this section. The other macros defined
+ * are only needed to help derive these 3.
+ *
+ * U8TO16_LE(x)   Read a little endian unsigned 32-bit int
+ * U8TO32_LE(x)   Read a little endian unsigned 32-bit int
+ * U8TO28_LE(x)   Read a little endian unsigned 32-bit int
+ * ROTL32(x,r)      Rotate x left by r bits
+ * ROTL64(x,r)      Rotate x left by r bits
+ * ROTR32(x,r)      Rotate x right by r bits
+ * ROTR64(x,r)      Rotate x right by r bits
+ */
+
+#ifndef U32_ALIGNMENT_REQUIRED
+  #if (BYTEORDER == 0x1234 || BYTEORDER == 0x12345678)
+    #define U8TO16_LE(ptr)   (*((const U16*)(ptr)))
+    #define U8TO32_LE(ptr)   (*((const U32*)(ptr)))
+    #define U8TO64_LE(ptr)   (*((const U64*)(ptr)))
+  #elif (BYTEORDER == 0x4321 || BYTEORDER == 0x87654321)
+    #if defined(__GNUC__) && (__GNUC__>4 || (__GNUC__==4 && __GNUC_MINOR__>=3))
+      #define U8TO16_LE(ptr)   (__builtin_bswap16(*((U16*)(ptr))))
+      #define U8TO32_LE(ptr)   (__builtin_bswap32(*((U32*)(ptr))))
+      #define U8TO64_LE(ptr)   (__builtin_bswap64(*((U64*)(ptr))))
+    #endif
+  #endif
+#endif
+
+#ifndef U8TO16_LE
+    /* Without a known fast bswap32 we're just as well off doing this */
+  #define U8TO16_LE(ptr)   ((U32)(ptr)[0]|(U32)(ptr)[1]<<8)
+  #define U8TO32_LE(ptr)   ((U32)(ptr)[0]|(U32)(ptr)[1]<<8|(U32)(ptr)[2]<<16|(U32)(ptr)[3]<<24)
+  #define U8TO64_LE(ptr)   ((U64)(ptr)[0]|(U64)(ptr)[1]<<8|(U64)(ptr)[2]<<16|(U64)(ptr)[3]<<24|\
+                            (U64)(ptr)[4]<<32|(U64)(ptr)[5]<<40|\
+                            (U64)(ptr)[6]<<48|(U64)(ptr)[7]<<56)
+#endif
+
+#ifdef CAN64BITHASH
+  #ifndef U64TYPE
+  /* This probably isn't going to work, but failing with a compiler error due to
+   lack of uint64_t is no worse than failing right now with an #error.  */
+  #define U64 uint64_t
+  #endif
+#endif
+
+/* Find best way to ROTL32/ROTL64 */
+#if defined(_MSC_VER)
+  #include <stdlib.h>  /* Microsoft put _rotl declaration in here */
+  #define ROTL32(x,r)  _rotl(x,r)
+  #define ROTR32(x,r)  _rotr(x,r)
+  #define ROTL64(x,r)  _rotl64(x,r)
+  #define ROTR64(x,r)  _rotr64(x,r)
+#else
+  /* gcc recognises this code and generates a rotate instruction for CPUs with one */
+  #define ROTL32(x,r)  (((U32)(x) << (r)) | ((U32)(x) >> (32 - (r))))
+  #define ROTR32(x,r)  (((U32)(x) << (32 - (r))) | ((U32)(x) >> (r)))
+  #define ROTL64(x,r)  ( ( (U64)(x) << (r) ) | ( (U64)(x) >> ( 64 - (r) ) ) )
+  #define ROTR64(x,r)  ( ( (U64)(x) << ( 64 - (r) ) ) | ( (U64)(x) >> (r) ) )
+#endif
+
+
+#ifdef UV_IS_QUAD
+#define ROTL_UV(x,r) ROTL64(x,r)
+#define ROTR_UV(x,r) ROTL64(x,r)
+#else
+#define ROTL_UV(x,r) ROTL32(x,r)
+#define ROTR_UV(x,r) ROTR32(x,r)
+#endif
+#if IVSIZE == 8
+#define CAN64BITHASH
+#endif
+
+#endif