1; RUN: opt -analyze --loop-accesses %s -enable-new-pm=0 | FileCheck %s
2; RUN: opt -passes=print-access-info %s -disable-output 2>&1 | FileCheck %s
3
4; This test defends against accidentally using alloc size instead of store size when performing run-time
5; boundary check of memory accesses. The IR in this file is based on
6; llvm/test/Analysis/LoopAccessAnalysis/memcheck-off-by-one-error.ll.
7; Here, we use i19 instead of i64 because it has a different alloc size to its store size.
8
9;CHECK: function 'fastCopy':
10;CHECK: (Low: %op High: (27 + %op))
11;CHECK: (Low: %src High: (27 + %src))
12
13define void @fastCopy(i8* nocapture readonly %src, i8* nocapture %op) {
14entry:
15  br label %while.body.preheader
16
17while.body.preheader:                             ; preds = %entry
18  br label %while.body
19
20while.body:                                       ; preds = %while.body.preheader, %while.body
21  %len.addr.07 = phi i32 [ %sub, %while.body ], [ 32, %while.body.preheader ]
22  %op.addr.06 = phi i8* [ %add.ptr1, %while.body ], [ %op, %while.body.preheader ]
23  %src.addr.05 = phi i8* [ %add.ptr, %while.body ], [ %src, %while.body.preheader ]
24  %0 = bitcast i8* %src.addr.05 to i19*
25  %1 = load i19, i19* %0, align 8
26  %2 = bitcast i8* %op.addr.06 to i19*
27  store i19 %1, i19* %2, align 8
28  %add.ptr = getelementptr inbounds i8, i8* %src.addr.05, i19 8
29  %add.ptr1 = getelementptr inbounds i8, i8* %op.addr.06, i19 8
30  %sub = add nsw i32 %len.addr.07, -8
31  %cmp = icmp sgt i32 %len.addr.07, 8
32  br i1 %cmp, label %while.body, label %while.end.loopexit
33
34while.end.loopexit:                               ; preds = %while.body
35  br label %while.end
36
37while.end:                                        ; preds = %while.end.loopexit, %entry
38  ret void
39}
40