Erik Eckstein da38e3ac81 SILCombine: optimize keypath instructions. ...

If the keypath argument of a keypath access function is a keypath literal instruction, generate the projection inline and remove the access function.
For example, replaces (simplified SIL):
   %kp = keypath ... stored_property #Foo.bar
   apply %keypath_runtime_function(%root_object, %kp, %addr)
with:
   %addr = struct_element_addr %root_object, #Foo.bar
   load/store %addr

Currently this only handles stored property patterns.

rdar://problem/36244734

2019-05-21 09:44:59 -07:00

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