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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 /ia32/Asmgenproof.v | |
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 'ia32/Asmgenproof.v')
-rw-r--r-- | ia32/Asmgenproof.v | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/ia32/Asmgenproof.v b/ia32/Asmgenproof.v index 28237237..c498b601 100644 --- a/ia32/Asmgenproof.v +++ b/ia32/Asmgenproof.v @@ -840,14 +840,14 @@ Transparent destroyed_at_function_entry. intros [tf [A B]]. simpl in B. inv B. exploit extcall_arguments_match; eauto. intros [args' [C D]]. - exploit external_call_mem_extends'; eauto. + exploit external_call_mem_extends; eauto. intros [res' [m2' [P [Q [R S]]]]]. left; econstructor; split. apply plus_one. eapply exec_step_external; eauto. - eapply external_call_symbols_preserved'; eauto. apply senv_preserved. + eapply external_call_symbols_preserved; eauto. apply senv_preserved. econstructor; eauto. unfold loc_external_result. - apply agree_set_other; auto. apply agree_set_mregs; auto. + apply agree_set_other; auto. apply agree_set_pair; auto. - (* return *) inv STACKS. simpl in *. |