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