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Cleanup, typechecking and documentation nits

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This commit is contained in:
Dimo
2017-07-27 18:05:38 -07:00
committed by Jakob Stoklund Olesen
parent 9767654dd7
commit a324d60ccc
3 changed files with 43 additions and 23 deletions
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13
lib/cretonne/meta/semantics/elaborate.py
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@@ -44,15 +44,20 @@ def find_matching_xform(d):
def cleanup_semantics(r, outputs):
# type: (Rtl, Set[Var]) -> Rtl
"""
The elaboration process creates a lot of redundant instruction pairs of the
shape:
The elaboration process creates a lot of redundant prim_to_bv conversions.
Cleanup the following cases:
1) prim_to_bv/prim_from_bv pair:
a.0 << prim_from_bv(bva.0)
...
bva.1 << prim_to_bv(a.0)
bva.1 << prim_to_bv(a.0) <-- redundant, replace by bva.0
...
Contract these to ease manual inspection.
2) prim_to_bv/prim_to-bv pair:
bva.0 << prim_to_bv(a)
...
bva.1 << prim_to_bv(a) <-- redundant, replace by bva.0
...
"""
new_defs = [] # type: List[Def]
subst_m = {v: v for v in r.vars()} # type: VarMap