[Bug target/53383] Allow -mpreferred-stack-boundary=3 on x86-64

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53383

--- Comment #25 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Katsunori Kumatani from comment #24)
> I think this bug should be reopened because the current behavior is
> restricting.

[...]

I agree. Let's remove this artificial dependency on -msse.

Patch in testing:

--cut here--
Index: config/i386/i386.c
===================================================================
--- config/i386/i386.c  (revision 246531)
+++ config/i386/i386.c  (working copy)
@@ -5927,9 +5927,8 @@ ix86_option_override_internal (bool main_args_p,
   ix86_preferred_stack_boundary = PREFERRED_STACK_BOUNDARY_DEFAULT;
   if (opts_set->x_ix86_preferred_stack_boundary_arg)
     {
-      int min = (TARGET_64BIT_P (opts->x_ix86_isa_flags)
-                ? (TARGET_SSE_P (opts->x_ix86_isa_flags) ? 4 : 3) : 2);
-      int max = (TARGET_SEH ? 4 : 12);
+      int min = TARGET_64BIT_P (opts->x_ix86_isa_flags)? 3 : 2;
+      int max = TARGET_SEH ? 4 : 12;

       if (opts->x_ix86_preferred_stack_boundary_arg < min
          || opts->x_ix86_preferred_stack_boundary_arg > max)
--cut here--