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A global variable with internal linkage where all uses are in one function and whose address is never taken is a non-escaping local object and can't alias anything else.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128140 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anders Carlsson
2011-03-23 02:19:48 +00:00
parent a2f45291e1
commit 90af342061
2 changed files with 52 additions and 0 deletions
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19
test/Analysis/BasicAA/non-escaping-local-object.ll Normal file
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; RUN: opt -basicaa -aa-eval -print-all-alias-modref-info -disable-output < %s |& FileCheck %s
@global = internal global i32 0
declare void @should_not_be_called()
declare i32 @f()
; CHECK: Function: g: 2 pointers, 0 call sites
define void @g(i32* nocapture %p) {
store i32 0, i32* @global
; @global is internal, is only used in this function, and never has its
; address taken so it can't alias p.
; CHECK: NoAlias: i32* %p, i32* @global
store i32 1, i32* %p
%1 = load i32* @global
ret void
}