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Fix the logic in BasicAliasAnalysis::aliasGEP for comparing GEP's with variable differences so that it actually does something sane. Fixes PR10881.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139276 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Friedman
2011-09-08 02:23:31 +00:00
parent e64fb28da1
commit 81ac8ddc67
2 changed files with 65 additions and 33 deletions
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32
test/Analysis/BasicAA/gep-alias.ll
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@@ -169,3 +169,35 @@ define i8 @test10([4 x i8] *%P, i32 %i) {
; CHECK: @test10
; CHECK: ret i8 0
}
; (This was a miscompilation.)
define float @test11(i32 %indvar, [4 x [2 x float]]* %q) nounwind ssp {
%tmp = mul i32 %indvar, -1
%dec = add i32 %tmp, 3
%scevgep = getelementptr [4 x [2 x float]]* %q, i32 0, i32 %dec
%scevgep35 = bitcast [2 x float]* %scevgep to i64*
%arrayidx28 = getelementptr inbounds [4 x [2 x float]]* %q, i32 0, i32 0
%y29 = getelementptr inbounds [2 x float]* %arrayidx28, i32 0, i32 1
store float 1.0, float* %y29, align 4
store i64 0, i64* %scevgep35, align 4
%tmp30 = load float* %y29, align 4
ret float %tmp30
; CHECK: @test11
; CHECK: ret float %tmp30
}
; (This was a miscompilation.)
define i32 @test12(i32 %x, i32 %y, i8* %p) nounwind {
%a = bitcast i8* %p to [13 x i8]*
%b = getelementptr [13 x i8]* %a, i32 %x
%c = bitcast [13 x i8]* %b to [15 x i8]*
%d = getelementptr [15 x i8]* %c, i32 %y, i32 8
%castd = bitcast i8* %d to i32*
%castp = bitcast i8* %p to i32*
store i32 1, i32* %castp
store i32 0, i32* %castd
%r = load i32* %castp
ret i32 %r
; CHECK: @test12
; CHECK: ret i32 %r
}