1 files changed, 96 insertions, 0 deletions
diff --git a/config/auto-aux/align.c b/config/auto-aux/align.c
new file mode 100644
index 000000000..15efbd4f7
--- /dev/null
+++ b/config/auto-aux/align.c
@@ -0,0 +1,96 @@
+#include <stdio.h>
+#include <signal.h>
+#include <setjmp.h>
+
+long foo;
+
+void access16(p)
+     short * p;
+{
+  foo = *p;
+}
+
+void access32(p)
+     long * p;
+{
+  foo = *p;
+}
+
+jmp_buf failure;
+
+void sig_handler(dummy)
+     int dummy;
+{
+  longjmp(failure, 1);
+}
+
+int test(fct, p)
+     void (*fct)();
+     char * p;
+{
+  int res;
+
+  signal(SIGSEGV, sig_handler);
+  signal(SIGBUS, sig_handler);
+  if(setjmp(failure) == 0) {
+    fct(p);
+    res = 0;
+  } else {
+    res = 1;
+  }
+  signal(SIGSEGV, SIG_DFL);
+  signal(SIGBUS, SIG_DFL);
+  return res;
+}
+
+jmp_buf timer;
+
+void alarm_handler(dummy)
+     int dummy;
+{
+  longjmp(timer, 1);
+}
+
+void use(n)
+     int n;
+{
+  return;
+}
+
+int speedtest(p)
+     char * p;
+{
+  int * q;
+  volatile int total;
+  int i;
+  volatile int sum;
+
+  signal(SIGALRM, alarm_handler);
+  sum = 0;
+  if (setjmp(timer) == 0) {
+    alarm(1);
+    total = 0;
+    while(1) {
+      for (q = (int *) p, i = 1000; i > 0; q++, i--)
+        sum += *q;
+      total++;
+    }
+  }
+  use(sum);
+  signal(SIGALRM, SIG_DFL);
+  return total;
+}
+
+main()
+{
+  long n[1001];
+  int speed_aligned, speed_unaligned;
+
+  if (test(access16, (char *) n + 1)) exit(1);
+  if (test(access32, (char *) n + 1)) exit(1);
+  if (test(access32, (char *) n + 2)) exit(1);
+  speed_aligned = speedtest((char *) n);
+  speed_unaligned = speedtest((char *) n + 1);
+  if (speed_aligned >= 3 * speed_unaligned) exit(1);
+  exit(0);
+}