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1 ; This tests the optimization of atomic cmpxchg w/ following cmp + branches. | 1 ; This tests the optimization of atomic cmpxchg w/ following cmp + branches. |
2 | 2 |
3 ; RUN: %p2i -i %s --args -O2 --verbose none \ | 3 ; RUN: %p2i -i %s --args -O2 --verbose none \ |
4 ; RUN: | llvm-mc -triple=i686-none-nacl -x86-asm-syntax=intel -filetype=obj \ | 4 ; RUN: | llvm-mc -triple=i686-none-nacl -x86-asm-syntax=intel -filetype=obj \ |
5 ; RUN: | llvm-objdump -d -symbolize -x86-asm-syntax=intel - \ | 5 ; RUN: | llvm-objdump -d -symbolize -x86-asm-syntax=intel - \ |
6 ; RUN: | FileCheck --check-prefix=O2 %s | 6 ; RUN: | FileCheck --check-prefix=O2 %s |
7 ; RUN: %p2i -i %s --args -Om1 --verbose none \ | 7 ; RUN: %p2i -i %s --args -Om1 --verbose none \ |
8 ; RUN: | llvm-mc -triple=i686-none-nacl -x86-asm-syntax=intel -filetype=obj \ | 8 ; RUN: | llvm-mc -triple=i686-none-nacl -x86-asm-syntax=intel -filetype=obj \ |
9 ; RUN: | llvm-objdump -d -symbolize -x86-asm-syntax=intel - \ | 9 ; RUN: | llvm-objdump -d -symbolize -x86-asm-syntax=intel - \ |
10 ; RUN: | FileCheck --check-prefix=OM1 %s | 10 ; RUN: | FileCheck --check-prefix=OM1 %s |
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32 %success = icmp eq i32 %expected_loop, %old | 32 %success = icmp eq i32 %expected_loop, %old |
33 br i1 %success, label %done, label %loop | 33 br i1 %success, label %done, label %loop |
34 | 34 |
35 done: | 35 done: |
36 call void @use_value(i32 %old) | 36 call void @use_value(i32 %old) |
37 ret i32 %succeeded_first_try | 37 ret i32 %succeeded_first_try |
38 } | 38 } |
39 ; O2-LABEL: test_atomic_cmpxchg_loop | 39 ; O2-LABEL: test_atomic_cmpxchg_loop |
40 ; O2: lock | 40 ; O2: lock |
41 ; O2-NEXT: cmpxchg dword ptr [e{{[^a].}}], e{{[^a]}} | 41 ; O2-NEXT: cmpxchg dword ptr [e{{[^a].}}], e{{[^a]}} |
42 ; O2-NOT: cmp | 42 ; O2-NEXT: j{{e|ne}} |
43 ; Make sure the phi assignment for succeeded_first_try is still there. | |
44 ; O2: mov {{.*}}, 2 | |
45 ; O2-NOT: cmp | |
46 ; O2: jne | |
47 ; Make sure the call isn't accidentally deleted. | 43 ; Make sure the call isn't accidentally deleted. |
48 ; O2: call | 44 ; O2: call |
49 ; | 45 ; |
50 ; Check that the unopt version does have a cmp | 46 ; Check that the unopt version does have a cmp |
51 ; OM1-LABEL: test_atomic_cmpxchg_loop | 47 ; OM1-LABEL: test_atomic_cmpxchg_loop |
52 ; OM1: lock | 48 ; OM1: lock |
53 ; OM1-NEXT: cmpxchg dword ptr [e{{[^a].}}], e{{[^a]}} | 49 ; OM1-NEXT: cmpxchg dword ptr [e{{[^a].}}], e{{[^a]}} |
54 ; OM1: cmp | 50 ; OM1: cmp |
55 ; OM1: je | 51 ; OM1: je |
56 ; OM1: call | 52 ; OM1: call |
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90 i32 %desired, i32 6, i32 6) | 86 i32 %desired, i32 6, i32 6) |
91 %success = icmp eq i32 %old, 0 | 87 %success = icmp eq i32 %old, 0 |
92 br i1 %success, label %done, label %loop | 88 br i1 %success, label %done, label %loop |
93 | 89 |
94 done: | 90 done: |
95 ret i32 %succeeded_first_try | 91 ret i32 %succeeded_first_try |
96 } | 92 } |
97 ; O2-LABEL: test_atomic_cmpxchg_loop_const | 93 ; O2-LABEL: test_atomic_cmpxchg_loop_const |
98 ; O2: lock | 94 ; O2: lock |
99 ; O2-NEXT: cmpxchg dword ptr [e{{[^a].}}], e{{[^a]}} | 95 ; O2-NEXT: cmpxchg dword ptr [e{{[^a].}}], e{{[^a]}} |
100 ; O2-NOT: cmp | 96 ; O2-NEXT: j{{e|ne}} |
101 ; O2: jne | |
102 | 97 |
103 ; This is a case where the flags cannot be reused (compare is for some | 98 ; This is a case where the flags cannot be reused (compare is for some |
104 ; other condition). | 99 ; other condition). |
105 define i32 @test_atomic_cmpxchg_no_opt(i32 %iptr, i32 %expected, i32 %desired) { | 100 define i32 @test_atomic_cmpxchg_no_opt(i32 %iptr, i32 %expected, i32 %desired) { |
106 entry: | 101 entry: |
107 br label %loop | 102 br label %loop |
108 | 103 |
109 loop: | 104 loop: |
110 %expected_loop = phi i32 [ %expected, %entry ], [ %old, %loop ] | 105 %expected_loop = phi i32 [ %expected, %entry ], [ %old, %loop ] |
111 %ptr = inttoptr i32 %iptr to i32* | 106 %ptr = inttoptr i32 %iptr to i32* |
112 %old = call i32 @llvm.nacl.atomic.cmpxchg.i32(i32* %ptr, i32 %expected_loop, | 107 %old = call i32 @llvm.nacl.atomic.cmpxchg.i32(i32* %ptr, i32 %expected_loop, |
113 i32 %desired, i32 6, i32 6) | 108 i32 %desired, i32 6, i32 6) |
114 %success = icmp sgt i32 %old, %expected | 109 %success = icmp sgt i32 %old, %expected |
115 br i1 %success, label %done, label %loop | 110 br i1 %success, label %done, label %loop |
116 | 111 |
117 done: | 112 done: |
118 ret i32 %old | 113 ret i32 %old |
119 } | 114 } |
120 ; O2-LABEL: test_atomic_cmpxchg_no_opt | 115 ; O2-LABEL: test_atomic_cmpxchg_no_opt |
121 ; O2: lock | 116 ; O2: lock |
122 ; O2-NEXT: cmpxchg dword ptr [e{{[^a].}}], e{{[^a]}} | 117 ; O2-NEXT: cmpxchg dword ptr [e{{[^a].}}], e{{[^a]}} |
123 ; O2: mov {{.*}} | |
124 ; O2: cmp | 118 ; O2: cmp |
125 ; O2: jle | 119 ; O2: jle |
126 | 120 |
127 ; Another case where the flags cannot be reused (the comparison result | 121 ; Another case where the flags cannot be reused (the comparison result |
128 ; is used somewhere else). | 122 ; is used somewhere else). |
129 define i32 @test_atomic_cmpxchg_no_opt2(i32 %iptr, i32 %expected, i32 %desired)
{ | 123 define i32 @test_atomic_cmpxchg_no_opt2(i32 %iptr, i32 %expected, i32 %desired)
{ |
130 entry: | 124 entry: |
131 br label %loop | 125 br label %loop |
132 | 126 |
133 loop: | 127 loop: |
134 %expected_loop = phi i32 [ %expected, %entry ], [ %old, %loop ] | 128 %expected_loop = phi i32 [ %expected, %entry ], [ %old, %loop ] |
135 %ptr = inttoptr i32 %iptr to i32* | 129 %ptr = inttoptr i32 %iptr to i32* |
136 %old = call i32 @llvm.nacl.atomic.cmpxchg.i32(i32* %ptr, i32 %expected_loop, | 130 %old = call i32 @llvm.nacl.atomic.cmpxchg.i32(i32* %ptr, i32 %expected_loop, |
137 i32 %desired, i32 6, i32 6) | 131 i32 %desired, i32 6, i32 6) |
138 %success = icmp eq i32 %old, %expected | 132 %success = icmp eq i32 %old, %expected |
139 br i1 %success, label %done, label %loop | 133 br i1 %success, label %done, label %loop |
140 | 134 |
141 done: | 135 done: |
142 %r = zext i1 %success to i32 | 136 %r = zext i1 %success to i32 |
143 ret i32 %r | 137 ret i32 %r |
144 } | 138 } |
145 ; O2-LABEL: test_atomic_cmpxchg_no_opt2 | 139 ; O2-LABEL: test_atomic_cmpxchg_no_opt2 |
146 ; O2: lock | 140 ; O2: lock |
147 ; O2-NEXT: cmpxchg dword ptr [e{{[^a].}}], e{{[^a]}} | 141 ; O2-NEXT: cmpxchg dword ptr [e{{[^a].}}], e{{[^a]}} |
148 ; O2: mov {{.*}} | 142 ; O2: mov {{.*}} |
149 ; O2: cmp | 143 ; O2: cmp |
150 ; O2: je | 144 ; O2: je |
151 | 145 |
152 ; ERRORS-NOT: ICE translation error | 146 ; ERRORS-NOT: ICE translation error |
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