gcc/0169-Struct-Reorg-Fix-several-bugs.patch

From 708ffe6f132ee39441b66b6ab6b98847d35916b7 Mon Sep 17 00:00:00 2001
From: eastb233 <xiezhiheng@huawei.com>
Date: Tue, 19 Dec 2023 17:03:12 +0800
Subject: [PATCH 1/2] [Struct Reorg] Fix several bugs

---
 gcc/ipa-struct-reorg/ipa-struct-reorg.c       | 50 ++++++-------------
 gcc/testsuite/gcc.dg/struct/struct_reorg-10.c | 29 +++++++++++
 gcc/testsuite/gcc.dg/struct/struct_reorg-11.c | 16 ++++++
 gcc/testsuite/gcc.dg/struct/struct_reorg-12.c | 26 ++++++++++
 4 files changed, 85 insertions(+), 36 deletions(-)
 create mode 100644 gcc/testsuite/gcc.dg/struct/struct_reorg-10.c
 create mode 100644 gcc/testsuite/gcc.dg/struct/struct_reorg-11.c
 create mode 100644 gcc/testsuite/gcc.dg/struct/struct_reorg-12.c

diff --git a/gcc/ipa-struct-reorg/ipa-struct-reorg.c b/gcc/ipa-struct-reorg/ipa-struct-reorg.c
index 7aba74ff1..0064811ac 100644
--- a/gcc/ipa-struct-reorg/ipa-struct-reorg.c
+++ b/gcc/ipa-struct-reorg/ipa-struct-reorg.c
@@ -4105,6 +4105,12 @@ ipa_struct_reorg::maybe_record_assign (cgraph_node *node, gassign *stmt)
 	maybe_mark_or_record_other_side (rhs, lhs, stmt);
       if (TREE_CODE (lhs) == SSA_NAME)
 	maybe_mark_or_record_other_side (lhs, rhs, stmt);
+
+      /* Handle missing ARRAY_REF cases.  */
+      if (TREE_CODE (lhs) == ARRAY_REF)
+	mark_type_as_escape (TREE_TYPE (lhs), escape_array, stmt);
+      if (TREE_CODE (rhs) == ARRAY_REF)
+	mark_type_as_escape (TREE_TYPE (rhs), escape_array, stmt);
     }
 }
 
@@ -6169,6 +6175,7 @@ ipa_struct_reorg::rewrite_expr (tree expr, tree newexpr[max_split], bool ignore_
   bool escape_from_base = false;
 
   tree newbase[max_split];
+  memset (newbase, 0, sizeof (tree[max_split]));
   memset (newexpr, 0, sizeof(tree[max_split]));
 
   if (TREE_CODE (expr) == CONSTRUCTOR)
@@ -8162,43 +8169,14 @@ ipa_struct_reorg::rewrite_cond (gcond *stmt,
    should be removed. */
 
 bool
-ipa_struct_reorg::rewrite_debug (gimple *stmt, gimple_stmt_iterator *)
+ipa_struct_reorg::rewrite_debug (gimple *, gimple_stmt_iterator *)
 {
-  if (current_layout_opt_level >= STRUCT_REORDER_FIELDS)
-    {
-      /* Delete debug gimple now.  */
-      return true;
-    }
-  bool remove = false;
-  if (gimple_debug_bind_p (stmt))
-    {
-      tree var = gimple_debug_bind_get_var (stmt);
-      tree newvar[max_split];
-      if (rewrite_expr (var, newvar, true))
-	remove = true;
-      if (gimple_debug_bind_has_value_p (stmt))
-	{
-          var = gimple_debug_bind_get_value (stmt);
-	  if (TREE_CODE (var) == POINTER_PLUS_EXPR)
-	    var = TREE_OPERAND (var, 0);
-	  if (rewrite_expr (var, newvar, true))
-	    remove = true;
-	}
-    }
-  else if (gimple_debug_source_bind_p (stmt))
-    {
-      tree var = gimple_debug_source_bind_get_var (stmt);
-      tree newvar[max_split];
-      if (rewrite_expr (var, newvar, true))
-	remove = true;
-      var = gimple_debug_source_bind_get_value (stmt);
-      if (TREE_CODE (var) == POINTER_PLUS_EXPR)
-	var = TREE_OPERAND (var, 0);
-      if (rewrite_expr (var, newvar, true))
-	remove = true;
-    }
-
-  return remove;
+  /* In debug statements, there might be some statements that have
+     been optimized out in gimple but left in debug gimple.  Sometimes
+     these statements need to be analyzed to escape, but in rewrite
+     stage it shouldn't happen.  It needs to care a lot to handle these
+     cases but seems useless.  So now we just delete debug gimple.  */
+  return true;
 }
 
 /* Rewrite PHI nodes, return true if the PHI was replaced. */
diff --git a/gcc/testsuite/gcc.dg/struct/struct_reorg-10.c b/gcc/testsuite/gcc.dg/struct/struct_reorg-10.c
new file mode 100644
index 000000000..ec422f76f
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/struct/struct_reorg-10.c
@@ -0,0 +1,29 @@
+/* { dg-do compile } */
+/* { dg-options "-w -g -O3 -flto-partition=one -fipa-struct-reorg -fwhole-program -S" } */
+
+struct a {
+  int b;
+  char c;
+};
+struct {
+  double d;
+  _Bool e;
+} * f;
+struct g {
+  struct a h;
+} i;
+long j;
+void k();
+void l() { k(i); }
+void k(struct a m) {
+  f->e = 0;
+  for (;;)
+    l();
+}
+int main() {
+  for (; j; f = 0) {
+    struct g *n = 0;
+    char o = n->h.c;
+  }
+  l();
+}
diff --git a/gcc/testsuite/gcc.dg/struct/struct_reorg-11.c b/gcc/testsuite/gcc.dg/struct/struct_reorg-11.c
new file mode 100644
index 000000000..3e42aa84a
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/struct/struct_reorg-11.c
@@ -0,0 +1,16 @@
+/* { dg-do compile } */
+/* { dg-options "-w -g -O3 -flto-partition=one -fipa-struct-reorg -fwhole-program -S" } */
+
+struct a {
+  int b;
+  double c;
+};
+struct d {
+  struct a e;
+};
+int f;
+int main() {
+  _Bool g;
+  struct d **h = 0;
+  g = *h += f;
+}
diff --git a/gcc/testsuite/gcc.dg/struct/struct_reorg-12.c b/gcc/testsuite/gcc.dg/struct/struct_reorg-12.c
new file mode 100644
index 000000000..d434f9fe0
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/struct/struct_reorg-12.c
@@ -0,0 +1,26 @@
+/* { dg-do compile } */
+/* { dg-options "-w -g -O3 -flto-partition=one -fipa-struct-reorg -fwhole-program -S" } */
+
+struct foo {
+  long element1;
+  long element2;
+};
+
+struct goo {
+  struct foo element_foo;
+};
+
+struct goo g1;
+
+void func () {
+  struct foo (*local)[] = 0;
+  long idx;
+  (g1).element_foo = (*local)[idx];
+}
+
+struct foo g2;
+int main () {
+  func ();
+  g2 = g1.element_foo;
+  return 0;
+}
-- 
2.33.0