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author | Xavier Leroy <xavier.leroy@inria.fr> | 2016-05-17 15:37:56 +0200 |
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committer | Xavier Leroy <xavier.leroy@inria.fr> | 2016-05-17 15:37:56 +0200 |
commit | 82f9d1f96b30106a338e77ec83b7321c2c65f929 (patch) | |
tree | 6b8bb30473b1385f8b84fe1600f592c2bd4abed7 /backend/XTL.ml | |
parent | 672393ef623acb3e230a8019d51c87e051a7567a (diff) | |
download | compcert-82f9d1f96b30106a338e77ec83b7321c2c65f929.tar.gz compcert-82f9d1f96b30106a338e77ec83b7321c2c65f929.zip |
Introduce register pairs to describe calling conventions more precisely
This commit changes the loc_arguments and loc_result functions that describe calling conventions so that each argument/result can be mapped either to a single location or (in the case of a 64-bit integer) to a pair of two 32-bit locations.
In the current CompCert, all arguments/results of type Tlong are systematically split in two 32-bit halves. We will need to change this in the future to support 64-bit processors. The alternative approach implemented by this commit enables the loc_arguments and loc_result functions to describe precisely which arguments need splitting. Eventually, the remainder of CompCert should not assume anything about splitting 64-bit types in two halves.
Summary of changes:
- AST: introduce the type "rpair A" of register pairs
- Conventions1, Conventions: use it when describing calling conventions
- LTL, Linear, Mach, Asm: honor the new calling conventions when observing external calls
- Events: suppress external_call', no longer useful
- All passes from Allocation to Asmgen: adapt accordingly.
Diffstat (limited to 'backend/XTL.ml')
-rw-r--r-- | backend/XTL.ml | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/backend/XTL.ml b/backend/XTL.ml index 2ddbc50a..a1b7f23b 100644 --- a/backend/XTL.ml +++ b/backend/XTL.ml @@ -64,6 +64,11 @@ let vlocs ll = List.map vloc ll let vmreg mr = L(R mr) let vmregs mrl = List.map vmreg mrl +let rec vlocpairs = function + | [] -> [] + | One l :: ll -> L l :: vlocpairs ll + | Twolong(l1, l2) :: ll -> L l1 :: L l2 :: vlocpairs ll + (* Tests over variables *) let is_stack_reg = function |