From 54f97d1988f623ba7422e13a504caeb5701ba93c Mon Sep 17 00:00:00 2001 From: Xavier Leroy Date: Fri, 21 Aug 2015 11:05:36 +0200 Subject: Refactoring of builtins and annotations in the back-end. Before, the back-end languages had distinct instructions - Iannot for annotations, taking structured expressions (annot_arg) as arguments, and producing no results' - Ibuiltin for other builtins, using simple pseudoregs/locations/registers as arguments and results. This branch enriches Ibuiltin instructions so that they take structured expressions (builtin_arg and builtin_res) as arguments and results. This way, - Annotations fit the general pattern of builtin functions, so Iannot instructions are removed. - EF_vload_global and EF_vstore_global become useless, as the same optimization can be achieved by EF_vload/vstore taking a structured argument of the "address of global" kind. - Better code can be generated for builtin_memcpy between stack locations, or volatile accesses to stack locations. Finally, this commit also introduces a new kind of external function, EF_debug, which is like EF_annot but produces no observable events. It will be used later to transport debug info through the back-end, without preventing optimizations. --- backend/Locations.v | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'backend/Locations.v') diff --git a/backend/Locations.v b/backend/Locations.v index 5674b93a..4ec24a14 100644 --- a/backend/Locations.v +++ b/backend/Locations.v @@ -377,6 +377,14 @@ Module Locmap. destruct vl; auto. destruct H. rewrite IHll; auto. apply gso; auto. apply Loc.diff_sym; auto. Qed. + Fixpoint setres (res: builtin_res mreg) (v: val) (m: t) : t := + match res with + | BR r => set (R r) v m + | BR_none => m + | BR_longofwords hi lo => + setres lo (Val.loword v) (setres hi (Val.hiword v) m) + end. + End Locmap. (** * Total ordering over locations *) -- cgit