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[[likely]] and [[unlikely]] are equivalent to the GNU hot/cold attributes, except that they can be applied to arbitrary statements as well as labels; this is most likely to be useful for marking if/else branches as likely or unlikely. Conveniently, PREDICT_EXPR fits the bill nicely as a representation. I also had to fix marking case labels as hot/cold, which didn't work before. Which then required me to force __attribute ((fallthrough)) to apply to the statement rather than the label. gcc/ * gimplify.c (gimplify_case_label_expr): Handle hot/cold attributes. gcc/c-family/ * c-lex.c (c_common_has_attribute): Handle likely/unlikely. * c-attribs.c (attr_cold_hot_exclusions): Make public. gcc/cp/ * tree.c (handle_likeliness_attribute): New. (std_attribute_table): Add likely/unlikely. * cp-gimplify.c (lookup_hotness_attribute, remove_hotness_attribute) (process_stmt_hotness_attribute, first_stmt): New. (genericize_if_stmt): Check for duplicate predictions. * parser.c (cp_parser_statement): Call process_stmt_hotness_attribute. (cp_parser_label_for_labeled_statement): Apply attributes to case. * decl.c (finish_case_label): Give label in template type void. * pt.c (tsubst_expr) [CASE_LABEL_EXPR]: Copy attributes. [PREDICT_EXPR]: Handle. From-SVN: r266223
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