===================================================================
@@ -2464,6 +2464,22 @@ extract_range_from_binary_expr (value_ra
}
}
+ /* For divisions, if flag_non_call_exceptions is true, we must
+ not eliminate a division by zero. */
+ if ((code == TRUNC_DIV_EXPR
+ || code == FLOOR_DIV_EXPR
+ || code == CEIL_DIV_EXPR
+ || code == EXACT_DIV_EXPR
+ || code == ROUND_DIV_EXPR)
+ && cfun->can_throw_non_call_exceptions
+ && (vr1.type != VR_RANGE
+ || symbolic_range_p (&vr1)
+ || range_includes_zero_p (&vr1)))
+ {
+ set_value_range_to_varying (vr);
+ return;
+ }
+
/* For divisions, if op0 is VR_RANGE, we can deduce a range
even if op1 is VR_VARYING, VR_ANTI_RANGE, symbolic or can
include 0. */
===================================================================
@@ -2755,7 +2755,8 @@ simplify_binary_operation_1 (enum rtx_co
else
{
/* 0/x is 0 (or x&0 if x has side-effects). */
- if (trueop0 == CONST0_RTX (mode))
+ if (trueop0 == CONST0_RTX (mode)
+ && !cfun->can_throw_non_call_exceptions)
{
if (side_effects_p (op1))
return simplify_gen_binary (AND, mode, op1, trueop0);
===================================================================
@@ -0,0 +1,45 @@
+/* With -fnon-call-exceptions 0 / 0 should not be eliminated. The .x
+ file sets the option. */
+
+#ifdef SIGNAL_SUPPRESS
+# define DO_TEST 0
+#elif defined (__powerpc__) || defined (__PPC__) || defined (__ppc__) || defined (__POWERPC__) || defined (__ppc)
+ /* On PPC division by zero does not trap. */
+# define DO_TEST 0
+#elif defined (__SPU__)
+ /* On SPU division by zero does not trap. */
+# define DO_TEST 0
+#else
+# define DO_TEST 1
+#endif
+
+#if DO_TEST
+
+#include <signal.h>
+
+void
+sigfpe (int signum __attribute__ ((unused)))
+{
+ exit (0);
+}
+
+#endif
+
+/* When optimizing, the compiler is smart enough to constant fold the
+ static unset variables i and j to produce 0 / 0, but it can't
+ eliminate the assignment to the global k. */
+static int i;
+static int j;
+int k;
+
+int
+main ()
+{
+#ifdef DO_TEST
+ signal (SIGFPE, sigfpe);
+ k = i / j;
+ abort ();
+#else
+ exit (0);
+#endif
+}
===================================================================
@@ -0,0 +1,2 @@
+set additional_flags "-fnon-call-exceptions"
+return 0