detect: prepare for SIMD optimizations

Make rule group head bitarray 16 bytes aligned and padded to 16 bytes
boundaries to assist SIMD operations in follow up commits.

(cherry picked from commit 4ba1f44e0d882ffb6d7d93b2864c9dd405f78ea5)

diff --git a/src/detect-engine-siggroup.c b/src/detect-engine-siggroup.c
index c05b6c3daac9c247b22ea75bc4e65548b684d9e6..dde000b49a060f4e2600d8afaafcc52314610821 100644 (file)
--- a/src/detect-engine-siggroup.c
+++ b/src/detect-engine-siggroup.c
@@ -64,7 +64,7 @@ void SigGroupHeadInitDataFree(SigGroupHeadInitData *sghid)
         sghid->match_array = NULL;
     }
     if (sghid->sig_array != NULL) {
-        SCFree(sghid->sig_array);
+        SCFreeAligned(sghid->sig_array);
         sghid->sig_array = NULL;
     }
     if (sghid->app_mpms != NULL) {
@@ -94,9 +94,12 @@ static SigGroupHeadInitData *SigGroupHeadInitDataAlloc(uint32_t size)
     memset(sghid, 0x00, sizeof(SigGroupHeadInitData));
 
     /* initialize the signature bitarray */
-    sghid->sig_size = size;
-    if ( (sghid->sig_array = SCMalloc(sghid->sig_size)) == NULL)
+    size = sghid->sig_size = size + 16 - (size % 16);
+    void *ptr = SCMallocAligned(sghid->sig_size, 16);
+    if (ptr == NULL)
         goto error;
+    memset(ptr, 0, size);
+    sghid->sig_array = ptr;
 
     memset(sghid->sig_array, 0, sghid->sig_size);