--- /dev/null
+/* PR rtl-optimization/28634. On targets with delayed branches,
+ dbr_schedule could do the next iteration's addition in the
+ branch delay slot, then subtract the value again if the branch
+ wasn't taken. This can lead to rounding errors. */
+double x = -0x1.0p53;
+double y = 1;
+int
+main (void)
+{
+ while (y > 0)
+ y += x;
+ if (y != x + 1)
+ abort ();
+ exit (0);
+}