This changes the Projection API so that you pass in an instruction and get back
an optional depending on what theinstruction was. This is much cleaner than
always needing to do a switch.
This commit also cleans up the naming in Projection so that we always use the
term "value projection" for struct_extract, tuple_extract, and
unchecked_enum_data instead of the term "extract". This lines up better with the
name we use for the *_addr instructions, "address projection" and avoids
ambiguity since unchecked_enum_data does not have the word "extract" in it.
Additionally by adding in the failable initializers, my centralization of the
initialization logic enables me to ensure that isAddrProjection and
isValueProjection stay in sync with the various constructors via asserts. This
should prevent future bugs if we add additional notions of "projection".
Swift SVN r23356
This is apart of some cleanups of the Projection class.
I also improved the comment at the top of projection to make its usage
clearer.
Swift SVN r23355
This will help the ARC optimizer given future function sig optimization work and
is in general good since this has been a hole in our load store forwarding for a
while.
rdar://18831605
Swift SVN r23102
We ignore casts when generating projection paths for alias analysis. When
comparing two paths, we say no alias when accessing different fields of
the same Decl Context.
Swift SVN r20353
A first element field of a nominal type is either the first element of a
struct or the first payload of an enum. We currently allow the stdlib to
rappel into struct heirarchies using reinterpretCast. This patch teaches
the optimizer how to rewrite such unchecked_addr_cast into
unchecked_enum_data_addr and struct_element_addr instructions. Then
Mem2Reg and Load Store Forwarding will remove the allocation generated
by such uses of reinterpret cast.
<rdar://problem/16703656>
Swift SVN r18977
Instead for vardecls, we use the index of the field in the structdecl itself as
a stable ordering of vardecls.
I validated that the indeterminism was gone by running the failing test 1000
times in a row. Doug and I were hitting the indeterminism with well less than
100 iterations before, so I feel the number of iterations is sufficient.
Swift SVN r13859
This class allows you to deal with tuple and nominal projections in a way that
is agnostic of either of them.
Expect some incoming utilities based off of this for dealing with what I call
'aggregate type trees'.
Swift SVN r13735
