c++: implement C++17 hardware interference size

[thirdparty/gcc.git] / gcc / config / i386 / i386-options.c

diff --git a/gcc/config/i386/i386-options.c b/gcc/config/i386/i386-options.c
index 2cb87cedec0b73cd005e6fac0ebc75f08a6b55e6..c0006b3674baad492027132dcfb8c73edbecfb1c 100644 (file)
--- a/gcc/config/i386/i386-options.c
+++ b/gcc/config/i386/i386-options.c
@@ -2579,6 +2579,12 @@ ix86_option_override_internal (bool main_args_p,
   SET_OPTION_IF_UNSET (opts, opts_set, param_l2_cache_size,
                       ix86_tune_cost->l2_cache_size);
 
+  /* 64B is the accepted value for these for all x86.  */
+  SET_OPTION_IF_UNSET (&global_options, &global_options_set,
+                      param_destruct_interfere_size, 64);
+  SET_OPTION_IF_UNSET (&global_options, &global_options_set,
+                      param_construct_interfere_size, 64);
+
   /* Enable sw prefetching at -O3 for CPUS that prefetching is helpful.  */
   if (opts->x_flag_prefetch_loop_arrays < 0
       && HAVE_prefetch