dfc3377954
Apparently in CI it's getting generated in the opposite order, one function per file will make the test pass either way.
37 lines
1.6 KiB
Rust
37 lines
1.6 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"]
|
|
|
|
#[repr(C, align(8))]
|
|
pub struct Big([u64; 7]);
|
|
pub fn replace_big(dst: &mut Big, src: Big) -> Big {
|
|
// Before the `read_via_copy` intrinsic, this emitted six `memcpy`s.
|
|
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 large type, we expect exactly three `memcpy`s
|
|
// CHECK-LABEL: define internal void @{{.+}}mem{{.+}}replace{{.+}}sret(%Big)
|
|
// CHECK-NOT: alloca
|
|
// CHECK: alloca %Big
|
|
// CHECK-NOT: alloca
|
|
// CHECK-NOT: call void @llvm.memcpy
|
|
// CHECK: call void @llvm.memcpy.{{.+}}({{i8\*|ptr}} align 8 %{{.*}}, {{i8\*|ptr}} align 8 %{{.*}}, i{{.*}} 56, i1 false)
|
|
// CHECK-NOT: call void @llvm.memcpy
|
|
// CHECK: call void @llvm.memcpy.{{.+}}({{i8\*|ptr}} align 8 %{{.*}}, {{i8\*|ptr}} align 8 %{{.*}}, i{{.*}} 56, i1 false)
|
|
// CHECK-NOT: call void @llvm.memcpy
|
|
// CHECK: call void @llvm.memcpy.{{.+}}({{i8\*|ptr}} align 8 %{{.*}}, {{i8\*|ptr}} align 8 %{{.*}}, i{{.*}} 56, i1 false)
|
|
// CHECK-NOT: call void @llvm.memcpy
|
|
|
|
// CHECK-NOT: call void @llvm.memcpy
|