| blob | 82c67811fb991ec496c3396ebc21fa6d2dc6ba40 |
1 ; Test 8-bit compare and swap.
2 ;
3 ; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s -check-prefix=CHECK-MAIN
4 ; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s -check-prefix=CHECK-SHIFT
6 ; Check compare and swap with a variable.
7 ; - CHECK is for the main loop.
8 ; - CHECK-SHIFT makes sure that the negated shift count used by the second
9 ; RLL is set up correctly. The negation is independent of the NILL and L
10 ; tested in CHECK. CHECK-SHIFT also checks that %r3 is not modified before
11 ; being used in the RISBG (in contrast to things like atomic addition,
12 ; which shift %r3 left so that %b is at the high end of the word).
13 define i8 @f1(i8 %dummy, i8 *%src, i8 %cmp, i8 %swap) {
14 ; CHECK-MAIN-LABEL: f1:
15 ; CHECK-MAIN: risbg [[RISBG:%r[1-9]+]], %r3, 0, 189, 0{{$}}
16 ; CHECK-MAIN-DAG: sll %r3, 3
17 ; CHECK-MAIN-DAG: l [[OLD:%r[0-9]+]], 0([[RISBG]])
18 ; CHECK-MAIN: [[LOOP:\.[^ ]*]]:
19 ; CHECK-MAIN: rll %r2, [[OLD]], 8(%r3)
20 ; CHECK-MAIN: risbg %r4, %r2, 32, 55, 0
21 ; CHECK-MAIN: crjlh %r2, %r4, [[EXIT:\.[^ ]*]]
22 ; CHECK-MAIN: risbg %r5, %r2, 32, 55, 0
23 ; CHECK-MAIN: rll [[NEW:%r[0-9]+]], %r5, -8({{%r[1-9]+}})
24 ; CHECK-MAIN: cs [[OLD]], [[NEW]], 0([[RISBG]])
25 ; CHECK-MAIN: jl [[LOOP]]
26 ; CHECK-MAIN: [[EXIT]]:
27 ; CHECK-MAIN-NOT: %r2
28 ; CHECK-MAIN: br %r14
29 ;
30 ; CHECK-SHIFT-LABEL: f1:
31 ; CHECK-SHIFT: sll [[SHIFT:%r[1-9]+]], 3
32 ; CHECK-SHIFT: lcr [[NEGSHIFT:%r[1-9]+]], [[SHIFT]]
33 ; CHECK-SHIFT: rll
34 ; CHECK-SHIFT: rll {{%r[0-9]+}}, %r5, -8([[NEGSHIFT]])
35 %pair = cmpxchg i8 *%src, i8 %cmp, i8 %swap seq_cst seq_cst
36 %res = extractvalue { i8, i1 } %pair, 0
37 ret i8 %res
38 }
40 ; Check compare and swap with constants. We should force the constants into
41 ; registers and use the sequence above.
42 define i8 @f2(i8 *%src) {
43 ; CHECK-LABEL: f2:
44 ; CHECK: lhi [[CMP:%r[0-9]+]], 42
45 ; CHECK: risbg [[CMP]], {{%r[0-9]+}}, 32, 55, 0
46 ; CHECK: risbg
47 ; CHECK: br %r14
48 ;
49 ; CHECK-SHIFT-LABEL: f2:
50 ; CHECK-SHIFT: lhi [[SWAP:%r[0-9]+]], 88
51 ; CHECK-SHIFT: risbg
52 ; CHECK-SHIFT: risbg [[SWAP]], {{%r[0-9]+}}, 32, 55, 0
53 ; CHECK-SHIFT: br %r14
54 %pair = cmpxchg i8 *%src, i8 42, i8 88 seq_cst seq_cst
55 %res = extractvalue { i8, i1 } %pair, 0
56 ret i8 %res
57 }
59 ; Check generating the comparison result.
60 define i32 @f3(i8 %dummy, i8 *%src, i8 %cmp, i8 %swap) {
61 ; CHECK-MAIN-LABEL: f3:
62 ; CHECK-MAIN: risbg [[RISBG:%r[1-9]+]], %r3, 0, 189, 0{{$}}
63 ; CHECK-MAIN-DAG: sll %r3, 3
64 ; CHECK-MAIN-DAG: l [[OLD:%r[0-9]+]], 0([[RISBG]])
65 ; CHECK-MAIN: [[LOOP:\.[^ ]*]]:
66 ; CHECK-MAIN: rll [[TMP:%r[0-9]+]], [[OLD]], 8(%r3)
67 ; CHECK-MAIN: risbg %r4, [[TMP]], 32, 55, 0
68 ; CHECK-MAIN: cr [[TMP]], %r4
69 ; CHECK-MAIN: jlh [[EXIT:\.[^ ]*]]
70 ; CHECK-MAIN: risbg %r5, [[TMP]], 32, 55, 0
71 ; CHECK-MAIN: rll [[NEW:%r[0-9]+]], %r5, -8({{%r[1-9]+}})
72 ; CHECK-MAIN: cs [[OLD]], [[NEW]], 0([[RISBG]])
73 ; CHECK-MAIN: jl [[LOOP]]
74 ; CHECK-MAIN: [[EXIT]]:
75 ; CHECK-MAIN-NEXT: ipm %r2
76 ; CHECK-MAIN-NEXT: afi %r2, -268435456
77 ; CHECK-MAIN-NEXT: srl %r2, 31
78 ; CHECK-MAIN-NOT: %r2
79 ; CHECK-MAIN: br %r14
80 ;
81 ; CHECK-SHIFT-LABEL: f3:
82 ; CHECK-SHIFT: sll [[SHIFT:%r[1-9]+]], 3
83 ; CHECK-SHIFT: lcr [[NEGSHIFT:%r[1-9]+]], [[SHIFT]]
84 ; CHECK-SHIFT: rll
85 ; CHECK-SHIFT: rll {{%r[0-9]+}}, %r5, -8([[NEGSHIFT]])
86 %pair = cmpxchg i8 *%src, i8 %cmp, i8 %swap seq_cst seq_cst
87 %val = extractvalue { i8, i1 } %pair, 1
88 %res = zext i1 %val to i32
89 ret i32 %res
90 }
93 declare void @g()
95 ; Check using the comparison result for a branch.
96 ; CHECK-LABEL: f4
97 ; CHECK-MAIN-LABEL: f4:
98 ; CHECK-MAIN: risbg [[RISBG:%r[1-9]+]], %r2, 0, 189, 0{{$}}
99 ; CHECK-MAIN-DAG: sll %r2, 3
100 ; CHECK-MAIN-DAG: l [[OLD:%r[0-9]+]], 0([[RISBG]])
101 ; CHECK-MAIN: [[LOOP:\.[^ ]*]]:
102 ; CHECK-MAIN: rll [[TMP:%r[0-9]+]], [[OLD]], 8(%r2)
103 ; CHECK-MAIN: risbg %r3, [[TMP]], 32, 55, 0
104 ; CHECK-MAIN: cr [[TMP]], %r3
105 ; CHECK-MAIN: jlh [[EXIT:\.[^ ]*]]
106 ; CHECK-MAIN: risbg %r4, [[TMP]], 32, 55, 0
107 ; CHECK-MAIN: rll [[NEW:%r[0-9]+]], %r4, -8({{%r[1-9]+}})
108 ; CHECK-MAIN: cs [[OLD]], [[NEW]], 0([[RISBG]])
109 ; CHECK-MAIN: jl [[LOOP]]
110 ; CHECK-MAIN: [[EXIT]]:
111 ; CHECK-MAIN-NEXT: jlh [[LABEL:\.[^ ]*]]
112 ; CHECK-MAIN: jg g
113 ; CHECK-MAIN: [[LABEL]]:
114 ; CHECK-MAIN: br %r14
115 ;
116 ; CHECK-SHIFT-LABEL: f4:
117 ; CHECK-SHIFT: sll %r2, 3
118 ; CHECK-SHIFT: lcr [[NEGSHIFT:%r[1-9]+]], %r2
119 ; CHECK-SHIFT: rll
120 ; CHECK-SHIFT: rll {{%r[0-9]+}}, %r4, -8([[NEGSHIFT]])
121 define void @f4(i8 *%src, i8 %cmp, i8 %swap) {
122 %pair = cmpxchg i8 *%src, i8 %cmp, i8 %swap seq_cst seq_cst
123 %cond = extractvalue { i8, i1 } %pair, 1
124 br i1 %cond, label %call, label %exit
126 call:
127 tail call void @g()
128 br label %exit
130 exit:
131 ret void
132 }
134 ; ... and the same with the inverted direction.
135 ; CHECK-MAIN-LABEL: f5:
136 ; CHECK-MAIN: risbg [[RISBG:%r[1-9]+]], %r2, 0, 189, 0{{$}}
137 ; CHECK-MAIN-DAG: sll %r2, 3
138 ; CHECK-MAIN-DAG: l [[OLD:%r[0-9]+]], 0([[RISBG]])
139 ; CHECK-MAIN: [[LOOP:\.[^ ]*]]:
140 ; CHECK-MAIN: rll [[TMP:%r[0-9]+]], [[OLD]], 8(%r2)
141 ; CHECK-MAIN: risbg %r3, [[TMP]], 32, 55, 0
142 ; CHECK-MAIN: cr [[TMP]], %r3
143 ; CHECK-MAIN: jlh [[EXIT:\.[^ ]*]]
144 ; CHECK-MAIN: risbg %r4, [[TMP]], 32, 55, 0
145 ; CHECK-MAIN: rll [[NEW:%r[0-9]+]], %r4, -8({{%r[1-9]+}})
146 ; CHECK-MAIN: cs [[OLD]], [[NEW]], 0([[RISBG]])
147 ; CHECK-MAIN: jl [[LOOP]]
148 ; CHECK-MAIN: [[EXIT]]:
149 ; CHECK-MAIN-NEXT: jlh [[LABEL:\.[^ ]*]]
150 ; CHECK-MAIN: br %r14
151 ; CHECK-MAIN: [[LABEL]]:
152 ; CHECK-MAIN: jg g
153 ;
154 ; CHECK-SHIFT-LABEL: f5:
155 ; CHECK-SHIFT: sll %r2, 3
156 ; CHECK-SHIFT: lcr [[NEGSHIFT:%r[1-9]+]], %r2
157 ; CHECK-SHIFT: rll
158 ; CHECK-SHIFT: rll {{%r[0-9]+}}, %r4, -8([[NEGSHIFT]])
159 define void @f5(i8 *%src, i8 %cmp, i8 %swap) {
160 %pair = cmpxchg i8 *%src, i8 %cmp, i8 %swap seq_cst seq_cst
161 %cond = extractvalue { i8, i1 } %pair, 1
162 br i1 %cond, label %exit, label %call
164 call:
165 tail call void @g()
166 br label %exit
168 exit:
169 ret void
170 }