1; RUN: opt < %s  -loop-vectorize -force-vector-interleave=1 -force-vector-width=4 -dce -instcombine -S | FileCheck %s
2
3target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
4
5; Make sure that the reverse iterators are calculated using 64bit arithmetic, not 32.
6;
7; int foo(int n, int *A) {
8;   int sum;
9;   for (int i=n; i > 0; i--)
10;     sum += A[i*2];
11;   return sum;
12; }
13;
14
15;CHECK-LABEL: @foo(
16;CHECK:  <i64 0, i64 -1, i64 -2, i64 -3>
17;CHECK: ret
18define i32 @foo(i32 %n, i32* nocapture %A) {
19  %1 = icmp sgt i32 %n, 0
20  br i1 %1, label %.lr.ph, label %._crit_edge
21
22.lr.ph:                                           ; preds = %0
23  %2 = sext i32 %n to i64
24  br label %3
25
26; <label>:3                                       ; preds = %.lr.ph, %3
27  %indvars.iv = phi i64 [ %2, %.lr.ph ], [ %indvars.iv.next, %3 ]
28  %sum.01 = phi i32 [ undef, %.lr.ph ], [ %9, %3 ]
29  %4 = trunc i64 %indvars.iv to i32
30  %5 = shl nsw i32 %4, 1
31  %6 = sext i32 %5 to i64
32  %7 = getelementptr inbounds i32, i32* %A, i64 %6
33  %8 = load i32, i32* %7, align 4
34  %9 = add nsw i32 %8, %sum.01
35  %indvars.iv.next = add i64 %indvars.iv, -1
36  %10 = trunc i64 %indvars.iv.next to i32
37  %11 = icmp sgt i32 %10, 0
38  br i1 %11, label %3, label %._crit_edge
39
40._crit_edge:                                      ; preds = %3, %0
41  %sum.0.lcssa = phi i32 [ undef, %0 ], [ %9, %3 ]
42  ret i32 %sum.0.lcssa
43}
44
45