tree 7b5f3c6e5d7841e156bc4f38f0ebde5f1a124a65
parent 675eb3b9ac547119f6db676ebdd172d40a797b1c
author Arnold Schwaighofer <aschwaighofer@apple.com> 1364321273 +0000
committer Arnold Schwaighofer <aschwaighofer@apple.com> 1364321273 +0000

BasicAA: Only query twice if the result of the more general query was MayAlias

This is a compile time optimization. Before the patch we would do two traversals
on each call to aliasGEP - one with a set size parameter one with UnknownSize.
We can do better by first checking the result of the alias query with
UnknownSize.
Only if this one returns MayAlias do we query a second time using size and type.

This recovers an about 7% compile time regression on spec/ammp.

radar://12349960

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178045 91177308-0d34-0410-b5e6-96231b3b80d8