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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/Linearize.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/Linearize.v')
-rw-r--r-- | backend/Linearize.v | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/backend/Linearize.v b/backend/Linearize.v index b1102e23..78cdd743 100644 --- a/backend/Linearize.v +++ b/backend/Linearize.v @@ -187,8 +187,6 @@ Fixpoint linearize_block (b: LTL.bblock) (k: code) : code := Ltailcall sig ros :: k | LTL.Lbuiltin ef args res :: b' => Lbuiltin ef args res :: linearize_block b' k - | LTL.Lannot ef args :: b' => - Lannot ef args :: linearize_block b' k | LTL.Lbranch s :: b' => add_branch s k | LTL.Lcond cond args s1 s2 :: b' => |