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Add a basic testcase for TBAA-aware LICM. 

llvm-svn: 116745
This commit is contained in:
Dan Gohman 2010-10-18 21:00:09 +00:00
parent fba9f74932
commit fe8abf88a0
1 changed files with 33 additions and 0 deletions
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33
llvm/test/Analysis/TypeBasedAliasAnalysis/licm.ll Normal file
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; RUN: opt -tbaa -licm -enable-tbaa -S < %s | FileCheck %s
; LICM should be able to hoist the address load out of the loop
; by using TBAA information.
; CHECK: entry:
; CHECK-NEXT: %tmp3 = load double** @P, !tbaa !0
; CHECK-NEXT: br label %for.body
@P = common global double* null
define void @foo(i64 %n) nounwind {
entry:
br label %for.body
for.body: ; preds = %entry, %for.body
%i.07 = phi i64 [ %inc, %for.body ], [ 0, %entry ]
%tmp3 = load double** @P, !tbaa !1
%scevgep = getelementptr double* %tmp3, i64 %i.07
%tmp4 = load double* %scevgep, !tbaa !2
%mul = fmul double %tmp4, 2.300000e+00
store double %mul, double* %scevgep, !tbaa !2
%inc = add i64 %i.07, 1
%exitcond = icmp eq i64 %inc, %n
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body, %entry
ret void
}
!0 = metadata !{metadata !"root", null}
!1 = metadata !{metadata !"pointer", metadata !0}
!2 = metadata !{metadata !"double", metadata !0}