diff options
Diffstat (limited to 'gcc/cp/decl.c')
| -rw-r--r-- | gcc/cp/decl.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/gcc/cp/decl.c b/gcc/cp/decl.c index bce62ad..c206502 100644 --- a/gcc/cp/decl.c +++ b/gcc/cp/decl.c @@ -4752,6 +4752,38 @@ cxx_init_decl_processing (void) /* Show we use EH for cleanups. */ if (flag_exceptions) using_eh_for_cleanups (); + + /* Check that the hardware interference sizes are at least + alignof(max_align_t), as required by the standard. */ + const int max_align = max_align_t_align () / BITS_PER_UNIT; + if (param_destruct_interfere_size) + { + if (param_destruct_interfere_size < max_align) + error ("%<--param destructive-interference-size=%d%> is less than " + "%d", param_destruct_interfere_size, max_align); + else if (param_destruct_interfere_size < param_l1_cache_line_size) + warning (OPT_Winterference_size, + "%<--param destructive-interference-size=%d%> " + "is less than %<--param l1-cache-line-size=%d%>", + param_destruct_interfere_size, param_l1_cache_line_size); + } + else if (param_l1_cache_line_size >= max_align) + param_destruct_interfere_size = param_l1_cache_line_size; + /* else leave it unset. */ + + if (param_construct_interfere_size) + { + if (param_construct_interfere_size < max_align) + error ("%<--param constructive-interference-size=%d%> is less than " + "%d", param_construct_interfere_size, max_align); + else if (param_construct_interfere_size > param_l1_cache_line_size) + warning (OPT_Winterference_size, + "%<--param constructive-interference-size=%d%> " + "is greater than %<--param l1-cache-line-size=%d%>", + param_construct_interfere_size, param_l1_cache_line_size); + } + else if (param_l1_cache_line_size >= max_align) + param_construct_interfere_size = param_l1_cache_line_size; } /* Enter an abi node in global-module context. returns a cookie to |