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
|
// Check that draining at the front or back doesn't copy memory.
//@ compile-flags: -O
//@ needs-deterministic-layouts
//@ ignore-std-debug-assertions (FIXME: checks for call detect scoped noalias metadata)
#![crate_type = "lib"]
use std::collections::VecDeque;
// CHECK-LABEL: @clear
// CHECK-NOT: call
// CHECK-NOT: br
// CHECK: getelementptr inbounds
// CHECK-NEXT: {{call void @llvm.memset|store}}
// CHECK-NEXT: ret void
#[no_mangle]
pub fn clear(v: &mut VecDeque<i32>) {
v.drain(..);
}
// CHECK-LABEL: @truncate
// CHECK-NOT: call
// CHECK: br
// CHECK-NOT: call
// CHECK: br
// CHECK-NOT: call
// CHECK: br
// CHECK-NOT: call
// CHECK: br
// CHECK-NOT: call
// CHECK-NOT: br
// CHECK: ret void
#[no_mangle]
pub fn truncate(v: &mut VecDeque<i32>, n: usize) {
if n < v.len() {
v.drain(n..);
}
}
// CHECK-LABEL: @advance
// CHECK-NOT: call
// CHECK: br
// CHECK-NOT: call
// CHECK: br
// CHECK-NOT: call
// CHECK: br
// CHECK-NOT: call
// CHECK: br
// CHECK-NOT: call
// CHECK: br
// CHECK-NOT: call
// CHECK-NOT: br
// CHECK: ret void
#[no_mangle]
pub fn advance(v: &mut VecDeque<i32>, n: usize) {
if n < v.len() {
v.drain(..n);
} else {
v.clear();
}
}
// CHECK-LABEL: @remove
// CHECK: call
// CHECK: ret void
#[no_mangle]
pub fn remove(v: &mut VecDeque<i32>, a: usize, b: usize) {
v.drain(a..b);
}
|
