build: Add multi-arch autoconf support

Added multi-arch support to configure.ac.
Updated header files to only export sse and avx functions on x86

Change-Id: I4d1f8d0eccabad55ee887dc092a565c468f5c629
Signed-off-by: John Kariuki <John.K.Kariuki@intel.com>

configure.ac

@@ -33,6 +33,16 @@ AM_CONDITIONAL([CPU_X86_64], [test "$CPU" = "x86_64"])
 AM_CONDITIONAL([CPU_X86_32], [test "$CPU" = "x86_32"])
 AM_CONDITIONAL([CPU_UNDEFINED], [test "x$CPU" = "x"])
 
+if test "$CPU" = "x86_64"; then
+   is_x86=yes
+else
+   if test "$CPU" = "x86_32"; then
+      is_x86=yes
+   else
+      is_x86=no
+   fi
+fi
+
 # Check for programs
 AC_PROG_CC_STDC
 AC_USE_SYSTEM_EXTENSIONS
@@ -50,6 +60,8 @@ AS_IF([test "x$enable_debug" = "xyes"], [
         AC_DEFINE(ENABLE_DEBUG, [1], [Debug messages.])
 ])
 
+# If this build is for x86, look for yasm and nasm
+if test x"$is_x86" = x"yes"; then
   # Check for yasm and yasm features
   AC_CHECK_PROG(HAVE_YASM, yasm, yes, no)
   if test "$HAVE_YASM" = "no"; then
@@ -120,6 +132,8 @@ if test \( x"$AS" = x"yasm" -a x"$yasm_knows_avx512" = x"yes" \) -o \( x"$AS" =
   else
     AC_MSG_RESULT([Assembler does not understand AVX512 opcodes.  Consider upgrading for best performance.])
   fi
+fi
+
 AM_CONDITIONAL(USE_YASM, test x"$AS" = x"yasm")
 AM_CONDITIONAL(USE_NASM, test x"$AS" = x"nasm")
 AM_CONDITIONAL(WITH_AVX512, test x"$have_as_knows_avx512" = x"yes")

include/erasure_code.h

@@ -98,33 +98,6 @@ void ec_init_tables(int k, int rows, unsigned char* a, unsigned char* gftbls);
 void ec_encode_data(int len, int k, int rows, unsigned char *gftbls, unsigned char **data,
 		    unsigned char **coding);
 
-/**
- * @brief Generate or decode erasure codes on blocks of data.
- *
- * Arch specific version of ec_encode_data() with same parameters.
- * @requires SSE4.1
- */
-void ec_encode_data_sse(int len, int k, int rows, unsigned char *gftbls, unsigned char **data,
-			unsigned char **coding);
-
-/**
- * @brief Generate or decode erasure codes on blocks of data.
- *
- * Arch specific version of ec_encode_data() with same parameters.
- * @requires AVX
- */
-void ec_encode_data_avx(int len, int k, int rows, unsigned char *gftbls, unsigned char **data,
-			unsigned char **coding);
-
-/**
- * @brief Generate or decode erasure codes on blocks of data.
- *
- * Arch specific version of ec_encode_data() with same parameters.
- * @requires AVX2
- */
-void ec_encode_data_avx2(int len, int k, int rows, unsigned char *gftbls, unsigned char **data,
-			 unsigned char **coding);
-
 /**
  * @brief Generate or decode erasure codes on blocks of data, runs baseline version.
  *
@@ -158,6 +131,127 @@ void ec_encode_data_base(int len, int srcs, int dests, unsigned char *v, unsigne
 void ec_encode_data_update(int len, int k, int rows, int vec_i, unsigned char *g_tbls,
 			   unsigned char *data, unsigned char **coding);
 
+/**
+ * @brief Generate update for encode or decode of erasure codes from single source.
+ *
+ * Baseline version of ec_encode_data_update().
+ */
+
+void ec_encode_data_update_base(int len, int k, int rows, int vec_i, unsigned char *v,
+				unsigned char *data, unsigned char **dest);
+
+/**
+ * @brief GF(2^8) vector dot product, runs baseline version.
+ *
+ * Does a GF(2^8) dot product across each byte of the input array and a constant
+ * set of coefficients to produce each byte of the output. Can be used for
+ * erasure coding encode and decode. Function requires pre-calculation of a
+ * 32*vlen byte constant array based on the input coefficients.
+ *
+ * @param len    Length of each vector in bytes. Must be >= 16.
+ * @param vlen   Number of vector sources.
+ * @param gftbls Pointer to 32*vlen byte array of pre-calculated constants based
+ *               on the array of input coefficients. Only elements 32*CONST*j + 1
+ *               of this array are used, where j = (0, 1, 2...) and CONST is the
+ *               number of elements in the array of input coefficients. The
+ *               elements used correspond to the original input coefficients.
+ * @param src    Array of pointers to source inputs.
+ * @param dest   Pointer to destination data array.
+ * @returns none
+ */
+
+
+void gf_vect_dot_prod_base(int len, int vlen, unsigned char *gftbls,
+                        unsigned char **src, unsigned char *dest);
+
+/**
+ * @brief GF(2^8) vector dot product, runs appropriate version.
+ *
+ * Does a GF(2^8) dot product across each byte of the input array and a constant
+ * set of coefficients to produce each byte of the output. Can be used for
+ * erasure coding encode and decode. Function requires pre-calculation of a
+ * 32*vlen byte constant array based on the input coefficients.
+ *
+ * This function determines what instruction sets are enabled and
+ * selects the appropriate version at runtime.
+ *
+ * @param len    Length of each vector in bytes. Must be >= 32.
+ * @param vlen   Number of vector sources.
+ * @param gftbls Pointer to 32*vlen byte array of pre-calculated constants based
+ *               on the array of input coefficients.
+ * @param src    Array of pointers to source inputs.
+ * @param dest   Pointer to destination data array.
+ * @returns none
+ */
+
+void gf_vect_dot_prod(int len, int vlen, unsigned char *gftbls,
+                        unsigned char **src, unsigned char *dest);
+
+/**
+ * @brief GF(2^8) vector multiply accumulate, runs appropriate version.
+ *
+ * Does a GF(2^8) multiply across each byte of input source with expanded
+ * constant and add to destination array. Can be used for erasure coding encode
+ * and decode update when only one source is available at a time. Function
+ * requires pre-calculation of a 32*vec byte constant array based on the input
+ * coefficients.
+ *
+ * This function determines what instruction sets are enabled and selects the
+ * appropriate version at runtime.
+ *
+ * @param len    Length of each vector in bytes. Must be >= 32.
+ * @param vec    The number of vector sources or rows in the generator matrix
+ * 		 for coding.
+ * @param vec_i  The vector index corresponding to the single input source.
+ * @param gftbls Pointer to array of input tables generated from coding
+ * 		 coefficients in ec_init_tables(). Must be of size 32*vec.
+ * @param src    Array of pointers to source inputs.
+ * @param dest   Pointer to destination data array.
+ * @returns none
+ */
+
+void gf_vect_mad(int len, int vec, int vec_i, unsigned char *gftbls, unsigned char *src,
+		 unsigned char *dest);
+
+/**
+ * @brief GF(2^8) vector multiply accumulate, baseline version.
+ *
+ * Baseline version of gf_vect_mad() with same parameters.
+ */
+
+void gf_vect_mad_base(int len, int vec, int vec_i, unsigned char *v, unsigned char *src,
+		      unsigned char *dest);
+
+// x86 only
+#if defined(__i386__) || defined(__x86_64__)
+
+/**
+ * @brief Generate or decode erasure codes on blocks of data.
+ *
+ * Arch specific version of ec_encode_data() with same parameters.
+ * @requires SSE4.1
+ */
+void ec_encode_data_sse(int len, int k, int rows, unsigned char *gftbls, unsigned char **data,
+			unsigned char **coding);
+
+/**
+ * @brief Generate or decode erasure codes on blocks of data.
+ *
+ * Arch specific version of ec_encode_data() with same parameters.
+ * @requires AVX
+ */
+void ec_encode_data_avx(int len, int k, int rows, unsigned char *gftbls, unsigned char **data,
+			unsigned char **coding);
+
+/**
+ * @brief Generate or decode erasure codes on blocks of data.
+ *
+ * Arch specific version of ec_encode_data() with same parameters.
+ * @requires AVX2
+ */
+void ec_encode_data_avx2(int len, int k, int rows, unsigned char *gftbls, unsigned char **data,
+			 unsigned char **coding);
+
 /**
  * @brief Generate update for encode or decode of erasure codes from single source.
  *
@@ -188,16 +282,6 @@ void ec_encode_data_update_avx(int len, int k, int rows, int vec_i, unsigned cha
 void ec_encode_data_update_avx2(int len, int k, int rows, int vec_i, unsigned char *g_tbls,
 				unsigned char *data, unsigned char **coding);
 
-/**
- * @brief Generate update for encode or decode of erasure codes from single source.
- *
- * Baseline version of ec_encode_data_update().
- */
-
-void ec_encode_data_update_base(int len, int k, int rows, int vec_i, unsigned char *v,
-				unsigned char *data, unsigned char **dest);
-
-
 /**
  * @brief GF(2^8) vector dot product.
  *
@@ -591,79 +675,6 @@ void gf_6vect_dot_prod_avx(int len, int vlen, unsigned char *gftbls,
 void gf_6vect_dot_prod_avx2(int len, int vlen, unsigned char *gftbls,
 			unsigned char **src, unsigned char **dest);
 
-/**
- * @brief GF(2^8) vector dot product, runs baseline version.
- *
- * Does a GF(2^8) dot product across each byte of the input array and a constant
- * set of coefficients to produce each byte of the output. Can be used for
- * erasure coding encode and decode. Function requires pre-calculation of a
- * 32*vlen byte constant array based on the input coefficients.
- *
- * @param len    Length of each vector in bytes. Must be >= 16.
- * @param vlen   Number of vector sources.
- * @param gftbls Pointer to 32*vlen byte array of pre-calculated constants based
- *               on the array of input coefficients. Only elements 32*CONST*j + 1
- *               of this array are used, where j = (0, 1, 2...) and CONST is the
- *               number of elements in the array of input coefficients. The
- *               elements used correspond to the original input coefficients.
- * @param src    Array of pointers to source inputs.
- * @param dest   Pointer to destination data array.
- * @returns none
- */
-
-void gf_vect_dot_prod_base(int len, int vlen, unsigned char *gftbls,
-                        unsigned char **src, unsigned char *dest);
-
-/**
- * @brief GF(2^8) vector dot product, runs appropriate version.
- *
- * Does a GF(2^8) dot product across each byte of the input array and a constant
- * set of coefficients to produce each byte of the output. Can be used for
- * erasure coding encode and decode. Function requires pre-calculation of a
- * 32*vlen byte constant array based on the input coefficients.
- *
- * This function determines what instruction sets are enabled and
- * selects the appropriate version at runtime.
- *
- * @param len    Length of each vector in bytes. Must be >= 32.
- * @param vlen   Number of vector sources.
- * @param gftbls Pointer to 32*vlen byte array of pre-calculated constants based
- *               on the array of input coefficients.
- * @param src    Array of pointers to source inputs.
- * @param dest   Pointer to destination data array.
- * @returns none
- */
-
-void gf_vect_dot_prod(int len, int vlen, unsigned char *gftbls,
-                        unsigned char **src, unsigned char *dest);
-
-
-/**
- * @brief GF(2^8) vector multiply accumulate, runs appropriate version.
- *
- * Does a GF(2^8) multiply across each byte of input source with expanded
- * constant and add to destination array. Can be used for erasure coding encode
- * and decode update when only one source is available at a time. Function
- * requires pre-calculation of a 32*vec byte constant array based on the input
- * coefficients.
- *
- * This function determines what instruction sets are enabled and selects the
- * appropriate version at runtime.
- *
- * @param len    Length of each vector in bytes. Must be >= 32.
- * @param vec    The number of vector sources or rows in the generator matrix
- * 		 for coding.
- * @param vec_i  The vector index corresponding to the single input source.
- * @param gftbls Pointer to array of input tables generated from coding
- * 		 coefficients in ec_init_tables(). Must be of size 32*vec.
- * @param src    Array of pointers to source inputs.
- * @param dest   Pointer to destination data array.
- * @returns none
- */
-
-void gf_vect_mad(int len, int vec, int vec_i, unsigned char *gftbls, unsigned char *src,
-		 unsigned char *dest);
-
 /**
  * @brief GF(2^8) vector multiply accumulate, arch specific version.
  *
@@ -693,14 +704,6 @@ void gf_vect_mad_avx(int len, int vec, int vec_i, unsigned char *gftbls, unsigne
 void gf_vect_mad_avx2(int len, int vec, int vec_i, unsigned char *gftbls, unsigned char *src,
 		      unsigned char *dest);
 
-/**
- * @brief GF(2^8) vector multiply accumulate, baseline version.
- *
- * Baseline version of gf_vect_mad() with same parameters.
- */
-
-void gf_vect_mad_base(int len, int vec, int vec_i, unsigned char *v, unsigned char *src,
-		      unsigned char *dest);
 
 /**
  * @brief GF(2^8) vector multiply with 2 accumulate.  SSE version.
@@ -854,6 +857,7 @@ void gf_6vect_mad_avx(int len, int vec, int vec_i, unsigned char *gftbls, unsign
 void gf_6vect_mad_avx2(int len, int vec, int vec_i, unsigned char *gftbls, unsigned char *src,
 		       unsigned char **dest);
 
+#endif
 
 /**********************************************************************
  * The remaining are lib support functions used in GF(2^8) operations.

include/gf_vect_mul.h

@@ -43,6 +43,9 @@
 extern "C" {
 #endif
 
+// x86 only
+#if defined(__i386__) || defined(__x86_64__)
+
  /**
  * @brief GF(2^8) vector multiply by constant.
  *
@@ -84,6 +87,7 @@ int gf_vect_mul_sse(int len, unsigned char *gftbl, void *src, void *dest);
 
 int gf_vect_mul_avx(int len, unsigned char *gftbl, void *src, void *dest);
 
+#endif
 
 /**
  * @brief GF(2^8) vector multiply by constant, runs appropriate version.

include/raid.h

@@ -120,6 +120,8 @@ int pq_check(int vects, int len, void **array);
 
 
 /* Arch specific versions */
+// x86 only
+#if defined(__i386__) || defined(__x86_64__)
 
 /**
  * @brief Generate XOR parity vector from N sources.
@@ -236,6 +238,7 @@ int pq_gen_avx2(int vects, int len, void **array);
 
 int pq_check_sse(int vects, int len, void **array);
 
+#endif
 
 /**
  * @brief Generate P+Q parity vectors from N sources, runs baseline version.