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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:20:29 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:20:29 +0000 |
commit | 631cd5845e8de329d0e227aaa707d7ea228b8f8f (patch) | |
tree | a1b87c8f8cad01cf18f7c5f57a08f102771ed303 /tests/codegen/ptr-read-metadata.rs | |
parent | Adding debian version 1.69.0+dfsg1-1. (diff) | |
download | rustc-631cd5845e8de329d0e227aaa707d7ea228b8f8f.tar.xz rustc-631cd5845e8de329d0e227aaa707d7ea228b8f8f.zip |
Merging upstream version 1.70.0+dfsg1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tests/codegen/ptr-read-metadata.rs')
-rw-r--r-- | tests/codegen/ptr-read-metadata.rs | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/tests/codegen/ptr-read-metadata.rs b/tests/codegen/ptr-read-metadata.rs new file mode 100644 index 000000000..e1e327266 --- /dev/null +++ b/tests/codegen/ptr-read-metadata.rs @@ -0,0 +1,96 @@ +// compile-flags: -O -Z merge-functions=disabled +// no-system-llvm +// ignore-debug (the extra assertions get in the way) + +#![crate_type = "lib"] + +// Ensure that various forms of reading pointers correctly annotate the `load`s +// with `!noundef` and `!range` metadata to enable extra optimization. + +use std::mem::MaybeUninit; + +// CHECK-LABEL: define noundef i8 @copy_byte( +#[no_mangle] +pub unsafe fn copy_byte(p: *const u8) -> u8 { + // CHECK-NOT: load + // CHECK: load i8, ptr %p, align 1 + // CHECK-SAME: !noundef ! + // CHECK-NOT: load + *p +} + +// CHECK-LABEL: define noundef i8 @read_byte( +#[no_mangle] +pub unsafe fn read_byte(p: *const u8) -> u8 { + // CHECK-NOT: load + // CHECK: load i8, ptr %p, align 1 + // CHECK-SAME: !noundef ! + // CHECK-NOT: load + p.read() +} + +// CHECK-LABEL: define i8 @read_byte_maybe_uninit( +#[no_mangle] +pub unsafe fn read_byte_maybe_uninit(p: *const MaybeUninit<u8>) -> MaybeUninit<u8> { + // CHECK-NOT: load + // CHECK: load i8, ptr %p, align 1 + // CHECK-NOT: noundef + // CHECK-NOT: load + p.read() +} + +// CHECK-LABEL: define noundef i8 @read_byte_assume_init( +#[no_mangle] +pub unsafe fn read_byte_assume_init(p: &MaybeUninit<u8>) -> u8 { + // CHECK-NOT: load + // CHECK: load i8, ptr %p, align 1 + // CHECK-SAME: !noundef ! + // CHECK-NOT: load + p.assume_init_read() +} + +// CHECK-LABEL: define noundef i32 @copy_char( +#[no_mangle] +pub unsafe fn copy_char(p: *const char) -> char { + // CHECK-NOT: load + // CHECK: load i32, ptr %p + // CHECK-SAME: !range ![[RANGE:[0-9]+]] + // CHECK-SAME: !noundef ! + // CHECK-NOT: load + *p +} + +// CHECK-LABEL: define noundef i32 @read_char( +#[no_mangle] +pub unsafe fn read_char(p: *const char) -> char { + // CHECK-NOT: load + // CHECK: load i32, ptr %p + // CHECK-SAME: !range ![[RANGE]] + // CHECK-SAME: !noundef ! + // CHECK-NOT: load + p.read() +} + +// CHECK-LABEL: define i32 @read_char_maybe_uninit( +#[no_mangle] +pub unsafe fn read_char_maybe_uninit(p: *const MaybeUninit<char>) -> MaybeUninit<char> { + // CHECK-NOT: load + // CHECK: load i32, ptr %p + // CHECK-NOT: range + // CHECK-NOT: noundef + // CHECK-NOT: load + p.read() +} + +// CHECK-LABEL: define noundef i32 @read_char_assume_init( +#[no_mangle] +pub unsafe fn read_char_assume_init(p: &MaybeUninit<char>) -> char { + // CHECK-NOT: load + // CHECK: load i32, ptr %p + // CHECK-SAME: !range ![[RANGE]] + // CHECK-SAME: !noundef ! + // CHECK-NOT: load + p.assume_init_read() +} + +// CHECK: ![[RANGE]] = !{i32 0, i32 1114112} |