diff options
author | herbelin <herbelin@85f007b7-540e-0410-9357-904b9bb8a0f7> | 2011-08-10 19:28:41 +0000 |
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committer | herbelin <herbelin@85f007b7-540e-0410-9357-904b9bb8a0f7> | 2011-08-10 19:28:41 +0000 |
commit | 9221176c38519e17522104f5adbbec3fcf755dd4 (patch) | |
tree | 9078dc616231819adcd923e205c6d6d0d2043fb3 /kernel/term.mli | |
parent | 71b3fd6a61aa58e88c4248dea242420ac7f8f437 (diff) |
Propagated information from the reduction tactics to the kernel so
that the kernel conversion solves the delta/delta critical pair the
same way the tactics did. This allows to improve Qed time when slow
down is due to conversion having (arbitrarily) made the wrong choice.
Propagation is done thanks to a new kind of cast called REVERTcast.
Notes:
- Vm conversion not modified
- size of vo generally grows because of additional casts
- this remains a heuristic... for the record, when a reduction tactic
is applied on the goal t leading to new goal t', this is translated
in the kernel in a conversion t' <= t where, hence, reducing in t'
must be preferred; what the propagation of reduction cast to the
kernel does not do is whether it is preferable to first unfold c or
to first compare u' and u in "c u' = c u"; in particular,
intermediate casts are sometimes useful to solve this kind of issues
(this is the case e.g. in Nijmegen/LinAlg/subspace_dim.v where the
combination "simpl;red" needs the intermediate cast to ensure Qed
answers quickly); henceforth the merge of nested casts in mkCast is
deactivated
- for tactic "change", REVERTcast should be used when conversion is in
the hypotheses, but convert_hyp does not (yet) support this (would
require e.g. that convert_hyp overwrite some given hyp id with a
body-cleared let-binding new_id := Cast(old_id,REVERTCast,t))
git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@14407 85f007b7-540e-0410-9357-904b9bb8a0f7
Diffstat (limited to 'kernel/term.mli')
-rw-r--r-- | kernel/term.mli | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/term.mli b/kernel/term.mli index 6fb884318..68fbd1807 100644 --- a/kernel/term.mli +++ b/kernel/term.mli @@ -93,7 +93,7 @@ val mkType : Univ.universe -> types (** This defines the strategy to use for verifiying a Cast *) -type cast_kind = VMcast | DEFAULTcast +type cast_kind = VMcast | DEFAULTcast | REVERTcast (** Constructs the term [t1::t2], i.e. the term t{_ 1} casted with the type t{_ 2} (that means t2 is declared as the type of t1). *) |