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27 lines
583 B
Rust
27 lines
583 B
Rust
// compile-flags: -O
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// ignore-debug
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// (with debug assertions turned on, `assert_unchecked` generates a real assertion)
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#![crate_type = "lib"]
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#[no_mangle]
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// CHECK-LABEL: @noop(
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pub fn noop(v: &mut Vec<u8>) {
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// CHECK-NOT: reserve_for_push
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// CHECK-NOT: call
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// CHECK: tail call void @llvm.assume
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// CHECK-NOT: reserve_for_push
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// CHECK-NOT: call
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// CHECK: ret
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if let Some(x) = v.pop() {
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v.push(x)
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}
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}
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#[no_mangle]
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// CHECK-LABEL: @push_byte(
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pub fn push_byte(v: &mut Vec<u8>) {
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// CHECK: call {{.*}}reserve_for_push
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v.push(3);
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}
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