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| author | Xavier Leroy <xavier.leroy@inria.fr> | 2019-04-15 15:21:49 +0200 |
|---|---|---|
| committer | Xavier Leroy <xavierleroy@users.noreply.github.com> | 2019-05-20 18:00:46 +0200 |
| commit | 996f2e071baaf52105714283d141af2eac8ffbfb (patch) | |
| tree | 0d3968e7cb130b2399fe53a30ac7b3b6405d2284 /x86/NeedOp.v | |
| parent | d002919334e83904447957f666f0d48704c5e55b (diff) | |
| download | compcert-996f2e071baaf52105714283d141af2eac8ffbfb.tar.gz compcert-996f2e071baaf52105714283d141af2eac8ffbfb.zip | |
Implement a `Osel` operation for x86
The operation compiles down to conditional moves.
Diffstat (limited to 'x86/NeedOp.v')
| -rw-r--r-- | x86/NeedOp.v | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/x86/NeedOp.v b/x86/NeedOp.v index 68ecc745..d9a58fbb 100644 --- a/x86/NeedOp.v +++ b/x86/NeedOp.v @@ -120,6 +120,7 @@ Definition needs_of_operation (op: operation) (nv: nval): list nval := | Ointoffloat | Ofloatofint | Ointofsingle | Osingleofint => op1 (default nv) | Olongoffloat | Ofloatoflong | Olongofsingle | Osingleoflong => op1 (default nv) | Ocmp c => needs_of_condition c + | Osel c ty => nv :: nv :: needs_of_condition c end. Definition operation_is_redundant (op: operation) (nv: nval): bool := @@ -231,6 +232,10 @@ Proof. erewrite needs_of_condition_sound by eauto. subst v; simpl. auto with na. subst v; auto with na. +- destruct (eval_condition c args m) as [b|] eqn:EC. + erewrite needs_of_condition_sound by eauto. + apply select_sound; auto. + simpl; auto with na. Qed. Lemma operation_is_redundant_sound: |