tree a2a28a065c7209cb9e3f7ebbf749ed75bf48d591
parent 3579e44bf33ed34f8b498834bfb40e407082bf31
author Chris Lattner <sabre@nondot.org> 1228857582 +0000
committer Chris Lattner <sabre@nondot.org> 1228857582 +0000

Teach BasicAA::getModRefInfo(CallSite, CallSite)  some
tricks based on readnone/readonly functions.

Teach memdep to look past readonly calls when analyzing
deps for a readonly call.  This allows elimination of a
few more calls from 403.gcc:

before:
     63 gvn    - Number of instructions PRE'd
 153986 gvn    - Number of instructions deleted
  50069 gvn    - Number of loads deleted

after:
     63 gvn    - Number of instructions PRE'd
 153991 gvn    - Number of instructions deleted
  50069 gvn    - Number of loads deleted

5 calls isn't much, but this adds plumbing for the next change.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60794 91177308-0d34-0410-b5e6-96231b3b80d8