mirror of
https://github.com/rust-lang/rust.git
synced 2025-10-31 13:04:42 +00:00
dfc3377954
Apparently in CI it's getting generated in the opposite order, one function per file will make the test pass either way.
34 lines
1.2 KiB
Rust
34 lines
1.2 KiB
Rust
// This test ensures that `mem::replace::<T>` only ever calls `@llvm.memcpy`
|
|
// with `size_of::<T>()` as the size, and never goes through any wrapper that
|
|
// may e.g. multiply `size_of::<T>()` with a variable "count" (which is only
|
|
// known to be `1` after inlining).
|
|
|
|
// compile-flags: -C no-prepopulate-passes -Zinline-mir=no
|
|
// ignore-debug: the debug assertions get in the way
|
|
|
|
#![crate_type = "lib"]
|
|
|
|
pub fn replace_byte(dst: &mut u8, src: u8) -> u8 {
|
|
std::mem::replace(dst, src)
|
|
}
|
|
|
|
// NOTE(eddyb) the `CHECK-NOT`s ensure that the only calls of `@llvm.memcpy` in
|
|
// the entire output, are the direct calls we want, from `ptr::replace`.
|
|
|
|
// CHECK-NOT: call void @llvm.memcpy
|
|
|
|
// For a small type, we expect one each of `load`/`store`/`memcpy` instead
|
|
// CHECK-LABEL: define internal noundef i8 @{{.+}}mem{{.+}}replace
|
|
// CHECK-NOT: alloca
|
|
// CHECK: alloca i8
|
|
// CHECK-NOT: alloca
|
|
// CHECK-NOT: call void @llvm.memcpy
|
|
// CHECK: load i8
|
|
// CHECK-NOT: call void @llvm.memcpy
|
|
// CHECK: store i8
|
|
// CHECK-NOT: call void @llvm.memcpy
|
|
// CHECK: call void @llvm.memcpy.{{.+}}({{i8\*|ptr}} align 1 %{{.*}}, {{i8\*|ptr}} align 1 %{{.*}}, i{{.*}} 1, i1 false)
|
|
// CHECK-NOT: call void @llvm.memcpy
|
|
|
|
// CHECK-NOT: call void @llvm.memcpy
|