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Auto merge of #101395 - saethlin:strict-provenance-codegen, r=nikic

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Add a codegen test for rust-lang/rust#96152

This is a regression test for https://github.com/rust-lang/rust/issues/96152, it is intended to check that our codegen for a particular strict provenance pattern is always as good as the ptr2int2ptr/provenance-ignoring style.

r? `@nikic`
This commit is contained in:
bors 2022-11-07 10:36:48 +00:00
commit 391ba78ab4
1 changed files with 37 additions and 0 deletions
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src/test/assembly/strict_provenance.rs Normal file
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// assembly-output: emit-asm
// compile-flags: -Copt-level=1
// only-x86_64
// min-llvm-version: 15.0
#![crate_type = "rlib"]
// CHECK-LABEL: old_style
// CHECK: movq %{{.*}}, %rax
// CHECK: orq $1, %rax
// CHECK: retq
#[no_mangle]
pub fn old_style(a: *mut u8) -> *mut u8 {
(a as usize | 1) as *mut u8
}
// CHECK-LABEL: cheri_compat
// CHECK: movq %{{.*}}, %rax
// CHECK: orq $1, %rax
// CHECK: retq
#[no_mangle]
pub fn cheri_compat(a: *mut u8) -> *mut u8 {
let old = a as usize;
let new = old | 1;
let diff = new.wrapping_sub(old);
a.wrapping_add(diff)
}
// CHECK-LABEL: definitely_not_a_null_pointer
// CHECK: movq %{{.*}}, %rax
// CHECK: orq $1, %rax
// CHECK: retq
#[no_mangle]
pub fn definitely_not_a_null_pointer(a: *mut u8) -> *mut u8 {
let old = a as usize;
let new = old | 1;
a.wrapping_sub(old).wrapping_add(new)
}