tree-optimization/118717 - store commoning vs. abnormals

When we sink common stores in cselim or the sink pass we have to
make sure to not introduce overlapping lifetimes for abnormals
used in the ref.  The easiest is to avoid sinking stmts which
reference abnormals at all which is what the following does.

	PR tree-optimization/118717
	* tree-ssa-phiopt.cc (cond_if_else_store_replacement_1):
	Do not common stores referencing abnormal SSA names.
	* tree-ssa-sink.cc (sink_common_stores_to_bb): Likewise.

	* gcc.dg/torture/pr118717.c: New testcase.

Author: rguenth

gcc/testsuite/gcc.dg/torture/pr118717.c

@@ -0,0 +1,41 @@
+/* { dg-do compile } */
+
+void jj(void);
+int ff1(void) __attribute__((__returns_twice__));
+struct s2 {
+  int prev;
+};
+typedef struct s1 {
+  unsigned interrupt_flag;
+  unsigned interrupt_mask;
+  int tag;
+  int state;
+}s1;
+int ff(void);
+static inline
+int mm(s1 *ec) {
+  if (ff())
+    if (ec->interrupt_flag & ~(ec)->interrupt_mask)
+      return 0;
+}
+void ll(s1 *ec) {
+  int t = 1;
+  int state;
+  if (t)
+  {
+    {
+      s1 *const _ec = ec;
+      struct s2 _tag = {0};
+      if (ff1())
+	state = ec->state;
+      else
+	state = 0;
+      if (!state)
+	mm (ec);
+      _ec->tag = _tag.prev;
+    }
+    if (state)
+      __builtin_exit(0);
+  }
+  jj();
+}

gcc/tree-ssa-phiopt.cc

@@ -3646,7 +3646,9 @@ cond_if_else_store_replacement_1 (basic_block then_bb, basic_block else_bb,
       || else_assign == NULL
       || !gimple_assign_single_p (else_assign)
       || gimple_clobber_p (else_assign)
-      || gimple_has_volatile_ops (else_assign))
+      || gimple_has_volatile_ops (else_assign)
+      || stmt_references_abnormal_ssa_name (then_assign)
+      || stmt_references_abnormal_ssa_name (else_assign))
     return false;
 
   lhs = gimple_assign_lhs (then_assign);

gcc/tree-ssa-sink.cc

@@ -36,6 +36,7 @@ along with GCC; see the file COPYING3.  If not see
 #include "cfgloop.h"
 #include "tree-eh.h"
 #include "tree-ssa-live.h"
+#include "tree-dfa.h"
 
 /* TODO:
    1. Sinking store only using scalar promotion (IE without moving the RHS):
@@ -516,7 +517,8 @@ sink_common_stores_to_bb (basic_block bb)
 	      gimple *def = SSA_NAME_DEF_STMT (arg);
 	      if (! is_gimple_assign (def)
 		  || stmt_can_throw_internal (cfun, def)
-		  || (gimple_phi_arg_edge (phi, i)->flags & EDGE_ABNORMAL))
+		  || (gimple_phi_arg_edge (phi, i)->flags & EDGE_ABNORMAL)
+		  || stmt_references_abnormal_ssa_name (def))
 		{
 		  /* ???  We could handle some cascading with the def being
 		     another PHI.  We'd have to insert multiple PHIs for