re PR rtl-optimization/12215 (ICE in make_label_edge with -fnon-call-exceptions -fno-gcse -O2)

PR optimization/12215
	* cse.c (cse_set_around_loop): Emit the move at the beginning
	of the next basic block for trapping sets.

From-SVN: r72141

gcc/ChangeLog

@@ -1,3 +1,9 @@
+2003-10-06  Eric Botcazou  <ebotcazou@libertysurf.fr>
+
+	PR optimization/12215
+	* cse.c (cse_set_around_loop): Emit the move at the beginning
+	of the next basic block for trapping sets.
+
 2003-10-06  Eric Botcazou  <ebotcazou@libertysurf.fr>
 
 	PR optimization/11637

gcc/cse.c

@@ -6666,7 +6666,15 @@ cse_set_around_loop (rtx x, rtx insn, rtx loop_start)
 			      abort ();
 			  }
 			else
-			  emit_insn_after (move, p);
+			  {
+			    if (control_flow_insn_p (p))
+			      /* p can cause a control flow transfer so it
+				 is the last insn of a basic block.  We can't
+				 therefore use emit_insn_after.  */
+			      emit_insn_before (move, next_nonnote_insn (p));
+			    else
+			      emit_insn_after (move, p);
+			  }
 		      }
 		    break;
 		  }

gcc/testsuite/ChangeLog

@@ -1,3 +1,7 @@
+2003-10-06  Wolfgang Bangerth  <bangerth@ticam.utexas.edu>
+
+	* g++.dg/opt/cfg2.C: New test.
+
 2003-10-06  Eric Botcazou  <ebotcazou@libertysurf.fr>
 
 	* g++.dg/opt/float1.C: New test.

gcc/testsuite/g++.dg/opt/cfg2.C

@@ -0,0 +1,38 @@
+// PR optimization/12215
+// Origin: <nick@ilm.com>
+// Reduced testcase by Wolfgang Bangerth <bangerth@ticam.utexas.edu>
+
+// This used to fail because the CSE pass destroyed the CFG in presence
+// of trapping loads, which led to the deletion of basic blocks.
+
+// { dg-do compile }
+// { dg-options "-O2 -fno-gcse -fnon-call-exceptions" }
+
+
+struct B {
+  ~B() throw() {}
+};
+
+struct X {
+  X(const char*, const B&);
+  ~X() {}
+};
+
+bool m();
+void f(int &i, float &arg0);
+
+void g (const char **argv) {
+  float val;
+  int i = 1;
+
+  try {
+    while ( i < 1 )
+      {
+        X arg(argv[i], B());
+        if (m())
+          throw(0);
+
+        f(i, val);
+      }
+  } catch (...) {}
+}