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Teach memdep to use pointsToConstantMemory to determine that loads

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from constant memory don't alias any stores.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@117636 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2010-10-29 01:14:04 +00:00
parent 1cfb043901
commit cd5c123a1d
2 changed files with 33 additions and 5 deletions
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test/Analysis/TypeBasedAliasAnalysis/dse.ll
+23
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@@ -25,6 +25,29 @@ define i8 @test0_no(i8* %a, i8* %b) nounwind {
ret i8 %y
}
; CHECK: @test1_yes
; CHECK-NEXT: load i8* %b
; CHECK-NEXT: store i8 1, i8* %a
; CHECK-NEXT: ret i8 %y
define i8 @test1_yes(i8* %a, i8* %b) nounwind {
store i8 0, i8* %a
%y = load i8* %b, !tbaa !5
store i8 1, i8* %a
ret i8 %y
}
; CHECK: @test1_no
; CHECK-NEXT: store i8 0, i8* %a
; CHECK-NEXT: load i8* %b
; CHECK-NEXT: store i8 1, i8* %a
; CHECK-NEXT: ret i8 %y
define i8 @test1_no(i8* %a, i8* %b) nounwind {
store i8 0, i8* %a
%y = load i8* %b, !tbaa !6
store i8 1, i8* %a
ret i8 %y
}
; Root note.
!0 = metadata !{ }
; Some type.