llvm-6502/test/Transforms/ObjCARC/gvn.ll
Michael Gottesman 95a1b3484d [objc-arc] Remove the alias analysis part of r185764.
Upon further reflection, the alias analysis part of r185764 is not a safe
change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185770 91177308-0d34-0410-b5e6-96231b3b80d8
2013-07-07 04:18:03 +00:00

23 lines
515 B
LLVM

; RUN: opt -S -basicaa -objc-arc-aa -gvn < %s | FileCheck %s
@x = common global i8* null, align 8
declare i8* @objc_retain(i8*)
; GVN should be able to eliminate this redundant load, with ARC-specific
; alias analysis.
; CHECK: define i8* @test0(i32 %n)
; CHECK-NEXT: entry:
; CHECK-NEXT: %s = load i8** @x
; CHECK-NOT: load
; CHECK: ret i8* %s
; CHECK-NEXT: }
define i8* @test0(i32 %n) nounwind {
entry:
%s = load i8** @x
%0 = tail call i8* @objc_retain(i8* %s) nounwind
%t = load i8** @x
ret i8* %t
}