re PR sanitizer/59503 (Bogus integer-overflow error with long long with -m32)

	PR sanitizer/59503
	* internal-fn.c (ubsan_expand_si_overflow_addsub_check): Call
	expand_binop with correct optab depending on code.
testsuite/
	* c-c++-common/ubsan/pr59503.c: New test.

From-SVN: r205984

gcc/ChangeLog

+2013-12-14  Marek Polacek  <polacek@redhat.com>
+
+	PR sanitizer/59503
+	* internal-fn.c (ubsan_expand_si_overflow_addsub_check): Call
+	expand_binop with correct optab depending on code.
+
 2013-12-14  Tom de Vries  <tom@codesourcery.com>
 
 	* calls.c (expand_call): Fix REG_PARM_STACK_SPACE comparison.

gcc/internal-fn.c

@@ -214,14 +214,14 @@ ubsan_expand_si_overflow_addsub_check (tree_code code, gimple stmt)
 
       /* Compute the operation.  On RTL level, the addition is always
 	 unsigned.  */
-      res = expand_binop (mode, add_optab, op0, op1,
-			  NULL_RTX, false, OPTAB_LIB_WIDEN);
+      res = expand_binop (mode, code == PLUS_EXPR ? add_optab : sub_optab,
+			  op0, op1, NULL_RTX, false, OPTAB_LIB_WIDEN);
 
       /* If the op1 is negative, we have to use a different check.  */
       emit_cmp_and_jump_insns (op1, const0_rtx, LT, NULL_RTX, mode,
 			       false, sub_check, PROB_EVEN);
 
-      /* Compare the result of the addition with one of the operands.  */
+      /* Compare the result of the operation with one of the operands.  */
       emit_cmp_and_jump_insns (res, op0, code == PLUS_EXPR ? GE : LE,
 			       NULL_RTX, mode, false, done_label,
 			       PROB_VERY_LIKELY);

gcc/testsuite/ChangeLog

+2013-12-14  Marek Polacek  <polacek@redhat.com>
+
+	PR sanitizer/59503
+	* c-c++-common/ubsan/pr59503.c: New test.
+
 2013-12-14  Janus Weil  <janus@gcc.gnu.org>
 
 	PR fortran/59450

gcc/testsuite/c-c++-common/ubsan/pr59503.c

+/* { dg-do run } */
+/* { dg-options "-fsanitize=signed-integer-overflow" } */
+/* { dg-skip-if "" { *-*-* } { "-flto" } { "" } } */
+
+int
+main (void)
+{
+  long long int a = 14;
+  long int b = 9;
+  asm volatile ("" : "+r" (a), "+r" (b));
+  if ((a - b) != 5)
+    __builtin_abort ();
+  return 0;
+}