#186 calculate architecture-dependent heap size

src/tarfind/tarfind.c

@@ -22,15 +22,22 @@
 /* BEEBS heap is just an array */
 /* 8995 = sizeof(tar_header_t) * ARCHIVE_FILES */
 #define roundup(d, u) ((((d)+(u))/(u))*(u))
-#define HEAP_SIZE roundup(8995, sizeof(void *))
-static char heap[HEAP_SIZE];
-
-void
-initialise_benchmark (void)
-{
-}
 
+// this is the basic TAR header format which is in ASCII
+typedef struct {
+  char filename[100];
+  char mode[8];  // file mode
+  char uID[8];   // user id
+  char gID[8];   // group id
+  char size[12]; // in bytes octal base
+  char mtime[12]; // numeric Unix time format (octal)
+  char checksum[8]; // for the header, ignored herew2
+  char isLink;
+  char linkedFile[100];
+} tar_header_t;
 
+#define HEAP_SIZE roundup((sizeof(tar_header_t) * ARCHIVE_FILES), sizeof(void *))
+static char _Alignas(_Alignof(tar_header_t)) heap[HEAP_SIZE]; 
 static int benchmark_body (int rpt);
 
 void
@@ -40,26 +47,15 @@ warm_caches (int  heat)
   return;
 }
 
-
 int
 benchmark (void)
 {
   return benchmark_body (LOCAL_SCALE_FACTOR * CPU_MHZ);
 }
-
-// this is the basic TAR header format which is in ASCII
-typedef struct {
-  char filename[100];
-  char mode[8];  // file mode
-  char uID[8];   // user id
-  char gID[8];   // group id
-  char size[12]; // in bytes octal base
-  char mtime[12]; // numeric Unix time format (octal)
-  char checksum[8]; // for the header, ignored herew2
-  char isLink;
-  char linkedFile[100];
-} tar_header_t;
-
+void
+initialise_benchmark (void)
+{
+}
 
 static int __attribute__ ((noinline))
 benchmark_body (int rpt)