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