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| author | Xavier Leroy <xavier.leroy@inria.fr> | 2016-10-02 16:17:51 +0200 |
|---|---|---|
| committer | Xavier Leroy <xavier.leroy@inria.fr> | 2016-10-02 16:17:51 +0200 |
| commit | f21a6b181dded86ef0e5c7ab94f74e5b960fd510 (patch) | |
| tree | 01bb7b59e438c60d12d87d869b6c890095a977f4 /ia32/Asmgenproof.v | |
| parent | a14b9578ee5297d954103e05d7b2d322816ddd8f (diff) | |
| download | compcert-f21a6b181dded86ef0e5c7ab94f74e5b960fd510.tar.gz compcert-f21a6b181dded86ef0e5c7ab94f74e5b960fd510.zip | |
Improve code generation for 64-bit signed integer division
Implement the 'shift right extended' trick, both in the generic implementation (backend/SplitLong) and in the IA32 port.
Note that now SelectDiv depends on SelectLong, and that some work was moved from SelectLong to SelectDiv.
Diffstat (limited to 'ia32/Asmgenproof.v')
| -rw-r--r-- | ia32/Asmgenproof.v | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/ia32/Asmgenproof.v b/ia32/Asmgenproof.v index bf14f010..79602e52 100644 --- a/ia32/Asmgenproof.v +++ b/ia32/Asmgenproof.v @@ -132,6 +132,13 @@ Proof. Qed. Hint Resolve mk_shrximm_label: labels. +Remark mk_shrxlimm_label: + forall n k c, mk_shrxlimm n k = OK c -> tail_nolabel k c. +Proof. + intros. monadInv H. destruct (Int.eq n Int.zero); TailNoLabel. +Qed. +Hint Resolve mk_shrxlimm_label: labels. + Remark mk_intconv_label: forall f r1 r2 k c, mk_intconv f r1 r2 k = OK c -> (forall r r', nolabel (f r r')) -> |