re PR sanitizer/88426 (Compiler crash if use special code with command line…

re PR sanitizer/88426 (Compiler crash if use special code with command line switch -fsanitize=float-cast-overflow)

	PR sanitizer/88426
	* c-convert.c (convert): Call c_fully_fold before calling
	ubsan_instrument_float_cast.

	* c-c++-common/ubsan/float-cast-overflow-11.c: New test.

From-SVN: r267022

gcc/c/ChangeLog

+2018-12-11  Jakub Jelinek  <jakub@redhat.com>
+
+	PR sanitizer/88426
+	* c-convert.c (convert): Call c_fully_fold before calling
+	ubsan_instrument_float_cast.
+
 2018-12-08  Segher Boessenkool  <segher@kernel.crashing.org>
 
 	* c-parser (c_parser_asm_statement) [RID_INLINE]: Delete stray line

gcc/c/c-convert.c

@@ -115,6 +115,7 @@ convert (tree type, tree expr)
 	  && COMPLETE_TYPE_P (type))
 	{
 	  expr = save_expr (expr);
+	  expr = c_fully_fold (expr, false, NULL);
 	  tree check = ubsan_instrument_float_cast (loc, type, expr);
 	  expr = fold_build1 (FIX_TRUNC_EXPR, type, expr);
 	  if (check == NULL_TREE)

gcc/testsuite/ChangeLog

+2018-12-11  Jakub Jelinek  <jakub@redhat.com>
+
+	PR sanitizer/88426
+	* c-c++-common/ubsan/float-cast-overflow-11.c: New test.
+
 2018-12-11  Yannick Moy  <moy@adacore.com>
 
 	* gnat.dg/ghost4.adb: New testcase.

gcc/testsuite/c-c++-common/ubsan/float-cast-overflow-11.c

+/* PR sanitizer/88426 */
+/* { dg-do compile } */
+/* { dg-options "-fsanitize=float-cast-overflow" } */
+
+int
+foo (void)
+{
+  const float v = 0.0f;
+  return (int) (v < 0.0f ? v : 0.0f);
+}