[Bug middle-end/69454] [6 Regression] ix86_expand_prologue internal compiler error: Segmentation fault

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69454

--- Comment #30 from H.J. Lu <hjl.tools at gmail dot com> ---
Try this one:

diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index a03a515..c82883e 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -3588,16 +3588,6 @@ convert_scalars_to_vector ()
   bitmap_obstack_release (NULL);
   df_process_deferred_rescans ();

-  /* Conversion means we may have 128bit register spills/fills
-     which require aligned stack.  */
-  if (converted_insns)
-    {
-      if (crtl->stack_alignment_needed < 128)
-       crtl->stack_alignment_needed = 128;
-      if (crtl->stack_alignment_estimated < 128)
-       crtl->stack_alignment_estimated = 128;
-    }
-
   return 0;
 }

@@ -29300,8 +29290,10 @@ ix86_minimum_alignment (tree exp, machine_mode mode,
     return align;

   /* Don't do dynamic stack realignment for long long objects with
-     -mpreferred-stack-boundary=2.  */
-  if ((mode == DImode || (type && TYPE_MODE (type) == DImode))
+     -mpreferred-stack-boundary=2.  The STV pass needs 64-bit alignment
+     for DImode.  */
+  if (!(TARGET_STV && TARGET_SSE2 && optimize > 1)
+      && (mode == DImode || (type && TYPE_MODE (type) == DImode))
       && (!type || !TYPE_USER_ALIGN (type))
       && (!decl || !DECL_USER_ALIGN (decl)))
     return 32;