From: Jakub Jelinek <jakub@redhat.com>
Date: Wed, 20 Feb 2019 23:02:29 +0000 (+0100)
Subject: re PR middle-end/89412 (gcc ICE in simplify_subreg, at simplify-rtx.c:6273 on i686... 
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=37d7267f8093e6720b05fec5a8eac26ade0b55ad;p=gcc.git

re PR middle-end/89412 (gcc ICE in simplify_subreg, at simplify-rtx.c:6273 on i686-linux-gnu)

	PR middle-end/89412
	* expr.c (expand_assignment): If result is a MEM, use change_address
	instead of simplify_gen_subreg.

	* gcc.c-torture/compile/pr89412.c: New test.

From-SVN: r269057
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index aba3eb8419d..fe3140363cd 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2019-02-20  Jakub Jelinek  <jakub@redhat.com>
+
+	PR middle-end/89412
+	* expr.c (expand_assignment): If result is a MEM, use change_address
+	instead of simplify_gen_subreg.
+
 2019-02-20  Jakub Jelinek  <jakub@redhat.com>
 	    David Malcolm  <dmalcolm@redhat.com>
 
diff --git a/gcc/expr.c b/gcc/expr.c
index ce71ae71089..9ff5e5f2d76 100644
--- a/gcc/expr.c
+++ b/gcc/expr.c
@@ -5211,9 +5211,13 @@ expand_assignment (tree to, tree from, bool nontemporal)
 		}
 	      else
 		{
-		  rtx from_rtx
-		    = simplify_gen_subreg (to_mode, result,
-					   TYPE_MODE (TREE_TYPE (from)), 0);
+		  rtx from_rtx;
+		  if (MEM_P (result))
+		    from_rtx = change_address (result, to_mode, NULL_RTX);
+		  else
+		    from_rtx
+		      = simplify_gen_subreg (to_mode, result,
+					     TYPE_MODE (TREE_TYPE (from)), 0);
 		  if (from_rtx)
 		    {
 		      emit_move_insn (XEXP (to_rtx, 0),
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 353e4d704a7..32a68cc71f4 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2019-02-20  Jakub Jelinek  <jakub@redhat.com>
+
+	PR middle-end/89412
+	* gcc.c-torture/compile/pr89412.c: New test.
+
 2019-02-20  Jakub Jelinek  <jakub@redhat.com>
 	    David Malcolm  <dmalcolm@redhat.com>
 
diff --git a/gcc/testsuite/gcc.c-torture/compile/pr89412.c b/gcc/testsuite/gcc.c-torture/compile/pr89412.c
new file mode 100644
index 00000000000..0d6ddd5db94
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/compile/pr89412.c
@@ -0,0 +1,16 @@
+/* PR middle-end/89412 */
+
+struct S { double a, b; } d;
+int e;
+double f;
+
+void
+foo ()
+{
+  _Complex double h;
+  while (e)
+    {
+      f = h;
+      *(struct S *) &h = d;
+    }
+}