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try_with_capacity for Vec, VecDeque, String

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#91913
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Kornel 2024-01-30 16:08:57 +00:00
parent f27a22c24a
commit 78fb977d6b
12 changed files with 155 additions and 4 deletions
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35
tests/codegen/vec-with-capacity.rs Normal file
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@ -0,0 +1,35 @@
//@ compile-flags: -O
//@ ignore-debug
// (with debug assertions turned on, `assert_unchecked` generates a real assertion)
#![crate_type = "lib"]
#![feature(try_with_capacity)]
// CHECK-LABEL: @with_capacity_does_not_grow1
#[no_mangle]
pub fn with_capacity_does_not_grow1() -> Vec<u32> {
let v = Vec::with_capacity(1234);
// CHECK: call {{.*}}__rust_alloc(
// CHECK-NOT: call {{.*}}__rust_realloc
// CHECK-NOT: call {{.*}}capacity_overflow
// CHECK-NOT: call {{.*}}finish_grow
// CHECK-NOT: call {{.*}}reserve
// CHECK-NOT: memcpy
// CHECK-NOT: memset
v
}
// CHECK-LABEL: @try_with_capacity_does_not_grow2
#[no_mangle]
pub fn try_with_capacity_does_not_grow2() -> Option<Vec<Vec<u8>>> {
let v = Vec::try_with_capacity(1234).ok()?;
// CHECK: call {{.*}}__rust_alloc(
// CHECK-NOT: call {{.*}}__rust_realloc
// CHECK-NOT: call {{.*}}capacity_overflow
// CHECK-NOT: call {{.*}}finish_grow
// CHECK-NOT: call {{.*}}handle_alloc_error
// CHECK-NOT: call {{.*}}reserve
// CHECK-NOT: memcpy
// CHECK-NOT: memset
Some(v)
}