Auto merge of #106458 - albertlarsan68:move-tests, r=jyn514

Move src/test to the root

See MCP at rust-lang/compiler-team#573

There may be more changes needed.

The first commit is just the move of the files:
You can check that the first commit did not do anything else than renames by running
```
git diff --diff-filter=r -M100% <rust-lang remote>/master <first commit hash>
```
The output should be empty, because the filter excludes renames, and the match threshold for qualifying a rename is 100%.

The second one is mostly a "find and replace" of `src/test` to `tests` and whatever is needed to make CI pass.

What is left to do:
---

- [x] Move directory
- [ ] Change references to `src/test`
    - [x] Change references in-tree
    - [ ] Change references in submodules / out-of-tree docs
- [x] Make CI pass:
    - [x] Fix tidy
    - [x] Fix tests
    - [x] Bless tests if needed (shouldn't normally)
- [ ] Merge it !

1 files changed, 55 insertions, 0 deletions

diff --git a/tests/codegen/uninit-consts.rs b/tests/codegen/uninit-consts.rs
new file mode 100644
index 00000000000..98a6761f8ab
--- /dev/null
+++ b/tests/codegen/uninit-consts.rs
@@ -0,0 +1,55 @@
+// compile-flags: -C no-prepopulate-passes
+// min-llvm-version: 14.0
+
+// Check that we use undef (and not zero) for uninitialized bytes in constants.
+
+#![crate_type = "lib"]
+
+use std::mem::MaybeUninit;
+
+pub struct PartiallyUninit {
+    x: u32,
+    y: MaybeUninit<[u8; 10]>
+}
+
+// CHECK: [[FULLY_UNINIT:@[0-9]+]] = private unnamed_addr constant <{ [10 x i8] }> undef
+
+// CHECK: [[PARTIALLY_UNINIT:@[0-9]+]] = private unnamed_addr constant <{ [4 x i8], [12 x i8] }> <{ [4 x i8] c"{{\\EF\\BE\\AD\\DE|\\DE\\AD\\BE\\EF}}", [12 x i8] undef }>, align 4
+
+// This shouldn't contain undef, since it contains more chunks
+// than the default value of uninit_const_chunk_threshold.
+// CHECK: [[UNINIT_PADDING_HUGE:@[0-9]+]] = private unnamed_addr constant <{ [32768 x i8] }> <{ [32768 x i8] c"{{.+}}" }>, align 4
+
+// CHECK: [[FULLY_UNINIT_HUGE:@[0-9]+]] = private unnamed_addr constant <{ [16384 x i8] }> undef
+
+// CHECK-LABEL: @fully_uninit
+#[no_mangle]
+pub const fn fully_uninit() -> MaybeUninit<[u8; 10]> {
+    const M: MaybeUninit<[u8; 10]> = MaybeUninit::uninit();
+    // CHECK: call void @llvm.memcpy.{{.+}}({{i8\*|ptr}} align 1 %{{[0-9]+}}, {{i8\*|ptr}} align 1 {{.*}}[[FULLY_UNINIT]]{{.*}}, i{{(32|64)}} 10, i1 false)
+    M
+}
+
+// CHECK-LABEL: @partially_uninit
+#[no_mangle]
+pub const fn partially_uninit() -> PartiallyUninit {
+    const X: PartiallyUninit = PartiallyUninit { x: 0xdeadbeef, y: MaybeUninit::uninit() };
+    // CHECK: call void @llvm.memcpy.{{.+}}({{i8\*|ptr}} align 4 %{{[0-9]+}}, {{i8\*|ptr}} align 4 {{.*}}[[PARTIALLY_UNINIT]]{{.*}}, i{{(32|64)}} 16, i1 false)
+    X
+}
+
+// CHECK-LABEL: @uninit_padding_huge
+#[no_mangle]
+pub const fn uninit_padding_huge() -> [(u32, u8); 4096] {
+    const X: [(u32, u8); 4096] = [(123, 45); 4096];
+    // CHECK: call void @llvm.memcpy.{{.+}}({{i8\*|ptr}} align 4 %{{[0-9]+}}, {{i8\*|ptr}} align 4 {{.*}}[[UNINIT_PADDING_HUGE]]{{.*}}, i{{(32|64)}} 32768, i1 false)
+    X
+}
+
+// CHECK-LABEL: @fully_uninit_huge
+#[no_mangle]
+pub const fn fully_uninit_huge() -> MaybeUninit<[u32; 4096]> {
+    const F: MaybeUninit<[u32; 4096]> = MaybeUninit::uninit();
+    // CHECK: call void @llvm.memcpy.{{.+}}({{i8\*|ptr}} align 4 %{{[0-9]+}}, {{i8\*|ptr}} align 4 {{.*}}[[FULLY_UNINIT_HUGE]]{{.*}}, i{{(32|64)}} 16384, i1 false)
+    F
+}