[committed] gimplify: Don't add GIMPLE_ASSUME if errors were seen [PR107369]

[committed] gimplify: Don't add GIMPLE_ASSUME if errors were seen [PR107369]

[Jakub Jelinek]

Hi!

The FEs emit errors about jumps into assume attribute conditions,
but when we add GIMPLE_ASSUME for the condition which is reachable
through those jumps, we can run into cfg verification diagnostics.

Fixed by throwing the IFN_ASSUME away during gimplification if
seen_error () - like we already do for -O0.  GIMPLE_ASSUME in the middle-end
is a pure optimization thing and if errors were reported, the optimizations
will not be beneficial for anything.

Bootstrapped/regtested on x86_64-linux and i686-linux, committed to trunk.

2022-10-25  Jakub Jelinek  <jakub@redhat.com>

	PR tree-optimization/107369
	* gimplify.cc (gimplify_call_expr): If seen_error, handle complex
	IFN_ASSUME the same as for -O0.

	* gcc.dg/attr-assume-4.c: New test.
	* g++.dg/cpp23/attr-assume8.C: New test.

--- gcc/gimplify.cc.jj	2022-10-18 10:38:48.146406234 +0200
+++ gcc/gimplify.cc	2022-10-24 10:22:08.590902730 +0200
@@ -3570,7 +3570,7 @@ gimplify_call_expr (tree *expr_p, gimple
 	      return GS_OK;
 	    }
 	  /* If not optimizing, ignore the assumptions.  */
-	  if (!optimize)
+	  if (!optimize || seen_error ())
 	    {
 	      *expr_p = NULL_TREE;
 	      return GS_ALL_DONE;
--- gcc/testsuite/gcc.dg/attr-assume-4.c.jj	2022-10-24 10:31:30.654197800 +0200
+++ gcc/testsuite/gcc.dg/attr-assume-4.c	2022-10-24 10:33:21.214682782 +0200
@@ -0,0 +1,12 @@
+/* PR tree-optimization/107369 */
+/* { dg-do compile } */
+/* { dg-options "-std=c2x -O1" } */
+
+void
+foo (int x)
+{
+  if (x == 1)
+    goto l1;				/* { dg-error "jump into statement expression" } */
+
+  [[gnu::assume (({ l1:; 1; }))]];	/* { dg-message "label 'l1' defined here" } */
+}
--- gcc/testsuite/g++.dg/cpp23/attr-assume8.C.jj	2022-10-24 10:48:35.550198403 +0200
+++ gcc/testsuite/g++.dg/cpp23/attr-assume8.C	2022-10-24 10:35:52.025616208 +0200
@@ -0,0 +1,12 @@
+// PR tree-optimization/107369
+// { dg-do compile { target c++11 } }
+// { dg-options "-O1" }
+
+void
+foo (int x)
+{
+  if (x == 1)
+    goto l1;			// { dg-message "from here" }
+
+  [[assume (({ l1:; 1; }))]];	// { dg-error "jump to label 'l1'" }
+}				// { dg-message "enters statement expression" "" { target *-*-* } .-1 }

	Jakub