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1; Test removal of AND operations that don't affect last 6 bits of rotate amount
2; operand.
3;
4; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
5
6; Test that AND is not removed when some lower 6 bits are not set.
7define i32 @f1(i32 %val, i32 %amt) {
8; CHECK-LABEL: f1:
9; CHECK: nil{{[lf]}} %r3, 31
10; CHECK: rll %r2, %r2, 0(%r3)
11  %and = and i32 %amt, 31
12
13  %inv = sub i32 32, %and
14  %parta = shl i32 %val, %and
15  %partb = lshr i32 %val, %inv
16
17  %rotl = or i32 %parta, %partb
18
19  ret i32 %rotl
20}
21
22; Test removal of AND mask with only bottom 6 bits set.
23define i32 @f2(i32 %val, i32 %amt) {
24; CHECK-LABEL: f2:
25; CHECK-NOT: nil{{[lf]}} %r3, 63
26; CHECK: rll %r2, %r2, 0(%r3)
27  %and = and i32 %amt, 63
28
29  %inv = sub i32 32, %and
30  %parta = shl i32 %val, %and
31  %partb = lshr i32 %val, %inv
32
33  %rotl = or i32 %parta, %partb
34
35  ret i32 %rotl
36}
37
38; Test removal of AND mask including but not limited to bottom 6 bits.
39define i32 @f3(i32 %val, i32 %amt) {
40; CHECK-LABEL: f3:
41; CHECK-NOT: nil{{[lf]}} %r3, 255
42; CHECK: rll %r2, %r2, 0(%r3)
43  %and = and i32 %amt, 255
44
45  %inv = sub i32 32, %and
46  %parta = shl i32 %val, %and
47  %partb = lshr i32 %val, %inv
48
49  %rotl = or i32 %parta, %partb
50
51  ret i32 %rotl
52}
53
54; Test removal of AND mask from RLLG.
55define i64 @f4(i64 %val, i64 %amt) {
56; CHECK-LABEL: f4:
57; CHECK-NOT: nil{{[lf]}} %r3, 63
58; CHECK: rllg %r2, %r2, 0(%r3)
59  %and = and i64 %amt, 63
60
61  %inv = sub i64 64, %and
62  %parta = shl i64 %val, %and
63  %partb = lshr i64 %val, %inv
64
65  %rotl = or i64 %parta, %partb
66
67  ret i64 %rotl
68}
69
70; Test that AND is not entirely removed if the result is reused.
71define i32 @f5(i32 %val, i32 %amt) {
72; CHECK-LABEL: f5:
73; CHECK: rll %r2, %r2, 0(%r3)
74; CHECK: nil{{[lf]}} %r3, 63
75; CHECK: ar %r2, %r3
76  %and = and i32 %amt, 63
77
78  %inv = sub i32 32, %and
79  %parta = shl i32 %val, %and
80  %partb = lshr i32 %val, %inv
81
82  %rotl = or i32 %parta, %partb
83
84  %reuse = add i32 %and, %rotl
85  ret i32 %reuse
86}
87