1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
|
; RUN: llc -verify-machineinstrs -mtriple=armv7-linux-gnu -O0 %s -o - | FileCheck %s
; RUN: llc -verify-machineinstrs -mtriple=thumbv8-linux-gnu -O0 %s -o - | FileCheck %s
; RUN: llc -verify-machineinstrs -mtriple=thumbv6m-none-eabi -O0 %s -o - | FileCheck %s --check-prefix=CHECK-T1
; CHECK-T1-NOT: ldrex
; CHECK-T1-NOT: strex
define { i8, i1 } @test_cmpxchg_8(i8* %addr, i8 %desired, i8 %new) nounwind {
; CHECK-LABEL: test_cmpxchg_8:
; CHECK: dmb ish
; CHECK: uxtb [[DESIRED:r[0-9]+]], [[DESIRED]]
; CHECK: [[RETRY:.LBB[0-9]+_[0-9]+]]:
; CHECK: ldrexb [[OLD:r[0-9]+]], [r0]
; CHECK: cmp [[OLD]], [[DESIRED]]
; CHECK: bne [[DONE:.LBB[0-9]+_[0-9]+]]
; CHECK: strexb [[STATUS:r[0-9]+]], r2, [r0]
; CHECK: cmp{{(\.w)?}} [[STATUS]], #0
; CHECK: bne [[RETRY]]
; CHECK: [[DONE]]:
; Materialisation of a boolean is done with sub/clz/lsr
; CHECK: uxtb [[CMP1:r[0-9]+]], [[DESIRED]]
; CHECK: sub{{(s)?}} [[CMP1]], [[OLD]], [[CMP1]]
; CHECK: clz [[CMP2:r[0-9]+]], [[CMP1]]
; CHECK: lsr{{(s)?}} {{r[0-9]+}}, [[CMP2]], #5
; CHECK: dmb ish
%res = cmpxchg i8* %addr, i8 %desired, i8 %new seq_cst monotonic
ret { i8, i1 } %res
}
define { i16, i1 } @test_cmpxchg_16(i16* %addr, i16 %desired, i16 %new) nounwind {
; CHECK-LABEL: test_cmpxchg_16:
; CHECK: dmb ish
; CHECK: uxth [[DESIRED:r[0-9]+]], [[DESIRED]]
; CHECK: [[RETRY:.LBB[0-9]+_[0-9]+]]:
; CHECK: ldrexh [[OLD:r[0-9]+]], [r0]
; CHECK: cmp [[OLD]], [[DESIRED]]
; CHECK: bne [[DONE:.LBB[0-9]+_[0-9]+]]
; CHECK: strexh [[STATUS:r[0-9]+]], r2, [r0]
; CHECK: cmp{{(\.w)?}} [[STATUS]], #0
; CHECK: bne [[RETRY]]
; CHECK: [[DONE]]:
; Materialisation of a boolean is done with sub/clz/lsr
; CHECK: uxth [[CMP1:r[0-9]+]], [[DESIRED]]
; CHECK: sub{{(s)?}} [[CMP1]], [[OLD]], [[CMP1]]
; CHECK: clz [[CMP2:r[0-9]+]], [[CMP1]]
; CHECK: lsr{{(s)?}} {{r[0-9]+}}, [[CMP2]], #5
; CHECK: dmb ish
%res = cmpxchg i16* %addr, i16 %desired, i16 %new seq_cst monotonic
ret { i16, i1 } %res
}
define { i32, i1 } @test_cmpxchg_32(i32* %addr, i32 %desired, i32 %new) nounwind {
; CHECK-LABEL: test_cmpxchg_32:
; CHECK: dmb ish
; CHECK-NOT: uxt
; CHECK: [[RETRY:.LBB[0-9]+_[0-9]+]]:
; CHECK: ldrex [[OLD:r[0-9]+]], [r0]
; CHECK: cmp [[OLD]], [[DESIRED]]
; CHECK: bne [[DONE:.LBB[0-9]+_[0-9]+]]
; CHECK: strex [[STATUS:r[0-9]+]], r2, [r0]
; CHECK: cmp{{(\.w)?}} [[STATUS]], #0
; CHECK: bne [[RETRY]]
; CHECK: [[DONE]]:
; Materialisation of a boolean is done with sub/clz/lsr
; CHECK: sub{{(s)?}} [[CMP1:r[0-9]+]], [[OLD]], [[DESIRED]]
; CHECK: clz [[CMP2:r[0-9]+]], [[CMP1]]
; CHECK: lsr{{(s)?}} {{r[0-9]+}}, [[CMP2]], #5
; CHECK: dmb ish
%res = cmpxchg i32* %addr, i32 %desired, i32 %new seq_cst monotonic
ret { i32, i1 } %res
}
define { i64, i1 } @test_cmpxchg_64(i64* %addr, i64 %desired, i64 %new) nounwind {
; CHECK-LABEL: test_cmpxchg_64:
; CHECK: dmb ish
; CHECK-NOT: uxt
; CHECK: [[RETRY:.LBB[0-9]+_[0-9]+]]:
; CHECK: ldrexd [[OLDLO:r[0-9]+]], [[OLDHI:r[0-9]+]], [r0]
; CHECK: cmp [[OLDLO]], r6
; CHECK: cmpeq [[OLDHI]], r7
; CHECK: bne [[DONE:.LBB[0-9]+_[0-9]+]]
; CHECK: strexd [[STATUS:r[0-9]+]], r4, r5, [r0]
; CHECK: cmp{{(\.w)?}} [[STATUS]], #0
; CHECK: bne [[RETRY]]
; CHECK: [[DONE]]:
; CHECK: dmb ish
%res = cmpxchg i64* %addr, i64 %desired, i64 %new seq_cst monotonic
ret { i64, i1 } %res
}
define { i64, i1 } @test_nontrivial_args(i64* %addr, i64 %desired, i64 %new) {
; CHECK-LABEL: test_nontrivial_args:
; CHECK: dmb ish
; CHECK-NOT: uxt
; CHECK: [[RETRY:.LBB[0-9]+_[0-9]+]]:
; CHECK: ldrexd [[OLDLO:r[0-9]+]], [[OLDHI:r[0-9]+]], [r0]
; CHECK: cmp [[OLDLO]], {{r[0-9]+}}
; CHECK: cmpeq [[OLDHI]], {{r[0-9]+}}
; CHECK: bne [[DONE:.LBB[0-9]+_[0-9]+]]
; CHECK: strexd [[STATUS:r[0-9]+]], {{r[0-9]+}}, {{r[0-9]+}}, [r0]
; CHECK: cmp{{(\.w)?}} [[STATUS]], #0
; CHECK: bne [[RETRY]]
; CHECK: [[DONE]]:
; CHECK: dmb ish
%desired1 = add i64 %desired, 1
%new1 = add i64 %new, 1
%res = cmpxchg i64* %addr, i64 %desired1, i64 %new1 seq_cst seq_cst
ret { i64, i1 } %res
}
; The following used to trigger an assertion when creating a spill on thumb2
; for a physreg with RC==GPRPairRegClass.
; CHECK-LABEL: test_cmpxchg_spillbug:
; CHECK: ldrexd
; CHECK: strexd
; CHECK: bne
define void @test_cmpxchg_spillbug() {
%v = cmpxchg i64* undef, i64 undef, i64 undef seq_cst seq_cst
ret void
}
|
