re PR tree-optimization/92930 (GCC incorrectly optimizes away __builtin_apply() calls)

	PR tree-optimization/92930
	* ipa-pure-const.c (special_builtin_state): Don't handle
	BUILT_IN_APPLY.  Formatting fixes.
	(check_call): Formatting fixes.

	* gcc.dg/tree-ssa/pr92930.c: New test.

From-SVN: r279394

gcc/ChangeLog

+2019-12-14  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/92930
+	* ipa-pure-const.c (special_builtin_state): Don't handle
+	BUILT_IN_APPLY.  Formatting fixes.
+	(check_call): Formatting fixes.
+
 2019-12-14  Iain Sandoe  <iain@sandoe.co.uk>
 
 	* config/darwin.h (DARWIN_EXTRA_SPECS): Add new

gcc/ipa-pure-const.c

@@ -511,35 +511,34 @@ worse_state (enum pure_const_state_e *state, bool *looping,
    but function using them is.  */
 static bool
 special_builtin_state (enum pure_const_state_e *state, bool *looping,
-			tree callee)
+		       tree callee)
 {
   if (DECL_BUILT_IN_CLASS (callee) == BUILT_IN_NORMAL)
     switch (DECL_FUNCTION_CODE (callee))
       {
-	case BUILT_IN_RETURN:
-	case BUILT_IN_UNREACHABLE:
-	CASE_BUILT_IN_ALLOCA:
-	case BUILT_IN_STACK_SAVE:
-	case BUILT_IN_STACK_RESTORE:
-	case BUILT_IN_EH_POINTER:
-	case BUILT_IN_EH_FILTER:
-	case BUILT_IN_UNWIND_RESUME:
-	case BUILT_IN_CXA_END_CLEANUP:
-	case BUILT_IN_EH_COPY_VALUES:
-	case BUILT_IN_FRAME_ADDRESS:
-	case BUILT_IN_APPLY:
-	case BUILT_IN_APPLY_ARGS:
-	case BUILT_IN_ASAN_BEFORE_DYNAMIC_INIT:
-	case BUILT_IN_ASAN_AFTER_DYNAMIC_INIT:
-	  *looping = false;
-	  *state = IPA_CONST;
-	  return true;
-	case BUILT_IN_PREFETCH:
-	  *looping = true;
-	  *state = IPA_CONST;
-	  return true;
-	default:
-	  break;
+      case BUILT_IN_RETURN:
+      case BUILT_IN_UNREACHABLE:
+      CASE_BUILT_IN_ALLOCA:
+      case BUILT_IN_STACK_SAVE:
+      case BUILT_IN_STACK_RESTORE:
+      case BUILT_IN_EH_POINTER:
+      case BUILT_IN_EH_FILTER:
+      case BUILT_IN_UNWIND_RESUME:
+      case BUILT_IN_CXA_END_CLEANUP:
+      case BUILT_IN_EH_COPY_VALUES:
+      case BUILT_IN_FRAME_ADDRESS:
+      case BUILT_IN_APPLY_ARGS:
+      case BUILT_IN_ASAN_BEFORE_DYNAMIC_INIT:
+      case BUILT_IN_ASAN_AFTER_DYNAMIC_INIT:
+	*looping = false;
+	*state = IPA_CONST;
+	return true;
+      case BUILT_IN_PREFETCH:
+	*looping = true;
+	*state = IPA_CONST;
+	return true;
+      default:
+	break;
       }
   return false;
 }
@@ -624,9 +623,10 @@ check_call (funct_state local, gcall *call, bool ipa)
 	  case BUILT_IN_LONGJMP:
 	  case BUILT_IN_NONLOCAL_GOTO:
 	    if (dump_file)
-	      fprintf (dump_file, "    longjmp and nonlocal goto is not const/pure\n");
+	      fprintf (dump_file,
+		       "    longjmp and nonlocal goto is not const/pure\n");
 	    local->pure_const_state = IPA_NEITHER;
-            local->looping = true;
+	    local->looping = true;
 	    break;
 	  default:
 	    break;
@@ -1532,7 +1532,7 @@ propagate_pure_const (void)
 		    }
 		}
 	      else if (special_builtin_state (&edge_state, &edge_looping,
-					       y->decl))
+					      y->decl))
 		;
 	      else
 		state_from_flags (&edge_state, &edge_looping,

gcc/testsuite/ChangeLog

+2019-12-14  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/92930
+	* gcc.dg/tree-ssa/pr92930.c: New test.
+
 2019-12-13  Martin Sebor  <msebor@redhat.com>
 
 	PR middle-end/91582

gcc/testsuite/gcc.dg/tree-ssa/pr92930.c

+/* PR tree-optimization/92930 */
+/* { dg-do compile { target untyped_assembly } } */
+/* { dg-options "-O2 -fdump-tree-optimized" } */
+/* { dg-final { scan-tree-dump "__builtin_apply " "optimized" } } */
+/* { dg-final { scan-tree-dump "__builtin_apply_args" "optimized" } } */
+
+void foo (int a, int b, int c, int d, int e, int f, int g);
+
+static void bar (int a, ...)
+{
+  __builtin_apply (foo, __builtin_apply_args (), 20);
+}
+
+int
+main ()
+{
+  bar (1024, 1025, 1026, 1027, 1028, 1029, 1030);
+  return 0;
+}