1; RUN: opt -S < %s -loop-unroll -unroll-count=4 | FileCheck %s
2;
3; Test induction variable simplify after loop unrolling. It should
4; expose nice opportunities for GVN.
5;
6; CHECK-NOT: while.body also ensures that loop unrolling (with SCEV)
7; removes unrolled loop exits given that 128 is a multiple of 4.
8
9target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-f80:128:128-v64:64:64-v128:128:128-a0:0:64-f80:32:32-n8:16:32"
10
11; PR10534: LoopUnroll not keeping canonical induction variable...
12; CHECK: while.body:
13; CHECK-NOT: while.body.1:
14; CHECK: %shr.1 = lshr i32 %bit_addr.addr.01, 5
15; CHECK: %arrayidx.1 = getelementptr inbounds i32, i32* %bitmap, i32 %shr.1
16; CHECK: %shr.2 = lshr i32 %bit_addr.addr.01, 5
17; CHECK: %arrayidx.2 = getelementptr inbounds i32, i32* %bitmap, i32 %shr.2
18; CHECK: %shr.3 = lshr i32 %bit_addr.addr.01, 5
19; CHECK: %arrayidx.3 = getelementptr inbounds i32, i32* %bitmap, i32 %shr.3
20define void @FlipBit(i32* nocapture %bitmap, i32 %bit_addr, i32 %nbits) nounwind {
21entry:
22  br label %while.body
23
24while.body:
25  %nbits.addr.02 = phi i32 [ 128, %entry ], [ %dec, %while.body ]
26  %bit_addr.addr.01 = phi i32 [ 0, %entry ], [ %inc, %while.body ]
27  %dec = add i32 %nbits.addr.02, -1
28  %shr = lshr i32 %bit_addr.addr.01, 5
29  %rem = and i32 %bit_addr.addr.01, 31
30  %shl = shl i32 1, %rem
31  %arrayidx = getelementptr inbounds i32, i32* %bitmap, i32 %shr
32  %tmp6 = load i32, i32* %arrayidx, align 4
33  %xor = xor i32 %tmp6, %shl
34  store i32 %xor, i32* %arrayidx, align 4
35  %inc = add i32 %bit_addr.addr.01, 1
36  %tobool = icmp eq i32 %dec, 0
37  br i1 %tobool, label %while.end, label %while.body
38
39while.end:
40  ret void
41}
42