[PATCH 4/6] Add macros for increasing data alignment

[Mans Rullgard <mans@mansr.com>]

This adds the LSX_ALIGN() macro to request a specified alignment of
static data and struct definitions using GCC and MSVC attributes.
Also check for the aligned_alloc() function and alias to Microsoft's
_aligned_malloc() if necessary.
---
 configure.ac |  2 +-
 src/util.h   | 20 ++++++++++++++++++++
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 23138a9..08f80e7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -207,7 +207,7 @@ AC_HEADER_STDC
 AC_CHECK_HEADERS(fcntl.h unistd.h byteswap.h sys/stat.h sys/time.h sys/timeb.h sys/types.h sys/utsname.h termios.h glob.h fenv.h)
 
 dnl Checks for library functions.
-AC_CHECK_FUNCS(strcasecmp strdup popen vsnprintf gettimeofday mkstemp fmemopen)
+AC_CHECK_FUNCS(strcasecmp strdup popen vsnprintf gettimeofday mkstemp fmemopen aligned_alloc)
 
 dnl Check if math library is needed.
 AC_SEARCH_LIBS([pow], [m])
diff --git a/src/util.h b/src/util.h
index 87970bb..b5cc9b8 100644
--- a/src/util.h
+++ b/src/util.h
@@ -184,6 +184,26 @@
 #define field_offset(type, field) ((size_t)&(((type *)0)->field))
 #define unless(x) if (!(x))
 
+/*----------------------------- Data alignment -------------------------------*/
+
+#ifdef __GNUC__
+#define LSX_ALIGN(n) __attribute__((aligned(n)))
+#elif defined _MSC_VER
+#define LSX_ALIGN(n) __declspec(align(n))
+#else
+#define LSX_ALIGN(n)
+#endif
+
+#ifdef HAVE_ALIGNED_ALLOC
+  #define aligned_free(p) free(p)
+#elif defined _MSC_VER
+  #define aligned_alloc(a, s) _aligned_malloc(s, a)
+  #define aligned_free(p) _aligned_free(p)
+#else
+  #define aligned_alloc(a, s) malloc(s)
+  #define aligned_free(p) free(p)
+#endif
+
 /*------------------------------- Maths stuff --------------------------------*/
 
 #include <math.h>
-- 
2.5.2


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