1; RUN: opt -loop-idiom -mtriple=r600-- -mcpu=SI -S < %s | FileCheck %s
2
3; Mostly copied from x86 version.
4
5;To recognize this pattern:
6;int popcount(unsigned long long a) {
7;    int c = 0;
8;    while (a) {
9;        c++;
10;        a &= a - 1;
11;    }
12;    return c;
13;}
14;
15
16; CHECK-LABEL: @popcount_i64
17; CHECK: entry
18; CHECK: llvm.ctpop.i64
19; CHECK: ret
20define i32 @popcount_i64(i64 %a) nounwind uwtable readnone ssp {
21entry:
22  %tobool3 = icmp eq i64 %a, 0
23  br i1 %tobool3, label %while.end, label %while.body
24
25while.body:                                       ; preds = %entry, %while.body
26  %c.05 = phi i32 [ %inc, %while.body ], [ 0, %entry ]
27  %a.addr.04 = phi i64 [ %and, %while.body ], [ %a, %entry ]
28  %inc = add nsw i32 %c.05, 1
29  %sub = add i64 %a.addr.04, -1
30  %and = and i64 %sub, %a.addr.04
31  %tobool = icmp eq i64 %and, 0
32  br i1 %tobool, label %while.end, label %while.body
33
34while.end:                                        ; preds = %while.body, %entry
35  %c.0.lcssa = phi i32 [ 0, %entry ], [ %inc, %while.body ]
36  ret i32 %c.0.lcssa
37}
38
39; CHECK-LABEL: @popcount_i32
40; CHECK: entry
41; CHECK: llvm.ctpop.i32
42; CHECK: ret
43define i32 @popcount_i32(i32 %a) nounwind uwtable readnone ssp {
44entry:
45  %tobool3 = icmp eq i32 %a, 0
46  br i1 %tobool3, label %while.end, label %while.body
47
48while.body:                                       ; preds = %entry, %while.body
49  %c.05 = phi i32 [ %inc, %while.body ], [ 0, %entry ]
50  %a.addr.04 = phi i32 [ %and, %while.body ], [ %a, %entry ]
51  %inc = add nsw i32 %c.05, 1
52  %sub = add i32 %a.addr.04, -1
53  %and = and i32 %sub, %a.addr.04
54  %tobool = icmp eq i32 %and, 0
55  br i1 %tobool, label %while.end, label %while.body
56
57while.end:                                        ; preds = %while.body, %entry
58  %c.0.lcssa = phi i32 [ 0, %entry ], [ %inc, %while.body ]
59  ret i32 %c.0.lcssa
60}
61
62; To recognize this pattern:
63;int popcount(unsigned long long a, int mydata1, int mydata2) {
64;    int c = 0;
65;    while (a) {
66;        c++;
67;        a &= a - 1;
68;        mydata1 *= c;
69;        mydata2 *= (int)a;
70;    }
71;    return c + mydata1 + mydata2;
72;}
73
74; CHECK-LABEL: @popcount2
75; CHECK: entry
76; CHECK: llvm.ctpop.i64
77; CHECK: ret
78define i32 @popcount2(i64 %a, i32 %mydata1, i32 %mydata2) nounwind uwtable readnone ssp {
79entry:
80  %tobool9 = icmp eq i64 %a, 0
81  br i1 %tobool9, label %while.end, label %while.body
82
83while.body:                                       ; preds = %entry, %while.body
84  %c.013 = phi i32 [ %inc, %while.body ], [ 0, %entry ]
85  %mydata2.addr.012 = phi i32 [ %mul1, %while.body ], [ %mydata2, %entry ]
86  %mydata1.addr.011 = phi i32 [ %mul, %while.body ], [ %mydata1, %entry ]
87  %a.addr.010 = phi i64 [ %and, %while.body ], [ %a, %entry ]
88  %inc = add nsw i32 %c.013, 1
89  %sub = add i64 %a.addr.010, -1
90  %and = and i64 %sub, %a.addr.010
91  %mul = mul nsw i32 %inc, %mydata1.addr.011
92  %conv = trunc i64 %and to i32
93  %mul1 = mul nsw i32 %conv, %mydata2.addr.012
94  %tobool = icmp eq i64 %and, 0
95  br i1 %tobool, label %while.end, label %while.body
96
97while.end:                                        ; preds = %while.body, %entry
98  %c.0.lcssa = phi i32 [ 0, %entry ], [ %inc, %while.body ]
99  %mydata2.addr.0.lcssa = phi i32 [ %mydata2, %entry ], [ %mul1, %while.body ]
100  %mydata1.addr.0.lcssa = phi i32 [ %mydata1, %entry ], [ %mul, %while.body ]
101  %add = add i32 %mydata2.addr.0.lcssa, %mydata1.addr.0.lcssa
102  %add2 = add i32 %add, %c.0.lcssa
103  ret i32 %add2
104}
105