forked from OSchip/llvm-project
81 lines
1.9 KiB
LLVM
81 lines
1.9 KiB
LLVM
; RUN: opt < %s -analyze -basicaa -da | FileCheck %s
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; Test that the dependence analysis generates the correct results when using
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; an aliased object that points to a different element in the same array.
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; PR33567 - https://bugs.llvm.org/show_bug.cgi?id=33567
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; void test1(int *A, int *B, int N) {
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; int *top = A;
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; int *bot = A + N/2;
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; for (int i = 0; i < N; i++)
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; B[i] = top[i] + bot[i];
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; }
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; CHECK-LABEL: test1
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; CHECK: da analyze - input [*|<]!
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define void @test1(i32* nocapture %A, i32* nocapture %B, i32 %N) #0 {
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entry:
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%cmp9 = icmp sgt i32 %N, 0
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br i1 %cmp9, label %for.body.lr.ph, label %for.end
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for.body.lr.ph:
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%div = sdiv i32 %N, 2
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%bot.gep = getelementptr i32, i32* %A, i32 %div
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br label %for.body
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for.body:
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%i = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.body ]
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%gep.0 = getelementptr i32, i32* %A, i32 %i
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%gep.1 = getelementptr i32, i32* %bot.gep, i32 %i
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%gep.B = getelementptr i32, i32* %B, i32 %i
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%0 = load i32, i32* %gep.0, align 4
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%1 = load i32, i32* %gep.1, align 4
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%add = add nsw i32 %1, %0
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store i32 %add, i32* %gep.B, align 4
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%inc = add nsw i32 %i, 1
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%exitcond = icmp eq i32 %inc, %N
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br i1 %exitcond, label %for.end, label %for.body
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for.end:
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ret void
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}
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; void test2(int *A, unsigned n) {
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; int *B = A + 1;
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; for (unsigned i = 0; i < n; ++i) {
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; A[i] = B[i];
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; }
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; }
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; CHECK-LABEL: test2
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; CHECK: da analyze - consistent anti [1]!
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define void @test2(i32*, i32) #3 {
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%3 = getelementptr inbounds i32, i32* %0, i64 1
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br label %4
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; <label>:4:
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%.0 = phi i32 [ 0, %2 ], [ %14, %13 ]
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%5 = sub i32 %1, 1
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%6 = icmp ult i32 %.0, %5
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br i1 %6, label %7, label %15
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; <label>:7:
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%8 = zext i32 %.0 to i64
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%9 = getelementptr inbounds i32, i32* %3, i64 %8
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%10 = load i32, i32* %9, align 4
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%11 = zext i32 %.0 to i64
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%12 = getelementptr inbounds i32, i32* %0, i64 %11
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store i32 %10, i32* %12, align 4
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br label %13
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; <label>:13:
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%14 = add i32 %.0, 1
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br label %4
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; <label>:15:
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ret void
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}
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