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author | Xavier Leroy <xavier.leroy@inria.fr> | 2015-08-21 11:05:36 +0200 |
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committer | Xavier Leroy <xavier.leroy@inria.fr> | 2015-08-21 11:05:36 +0200 |
commit | 54f97d1988f623ba7422e13a504caeb5701ba93c (patch) | |
tree | d8dea46837352979490f4ed4516f9649fef41b98 /backend/Liveness.v | |
parent | b4846ffadfa3fbb73ffa7d9c43e5218adeece8da (diff) | |
download | compcert-54f97d1988f623ba7422e13a504caeb5701ba93c.tar.gz compcert-54f97d1988f623ba7422e13a504caeb5701ba93c.zip |
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.
Diffstat (limited to 'backend/Liveness.v')
-rw-r--r-- | backend/Liveness.v | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/backend/Liveness.v b/backend/Liveness.v index ce1a798a..b8a5f965 100644 --- a/backend/Liveness.v +++ b/backend/Liveness.v @@ -92,9 +92,8 @@ Definition transfer | Itailcall sig ros args => reg_list_live args (reg_sum_live ros Regset.empty) | Ibuiltin ef args res s => - reg_list_live args (reg_dead res after) - | Iannot ef args s => - reg_list_live (params_of_annot_args args) after + reg_list_live (params_of_builtin_args args) + (reg_list_dead (params_of_builtin_res res) after) | Icond cond args ifso ifnot => reg_list_live args after | Ijumptable arg tbl => |