38 lines
860 B
Rust
38 lines
860 B
Rust
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// assembly-output: emit-asm
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// compile-flags: -Copt-level=1
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// only-x86_64
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// min-llvm-version: 15.0
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#![crate_type = "rlib"]
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// CHECK-LABEL: old_style
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// CHECK: movq %{{.*}}, %rax
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// CHECK: orq $1, %rax
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// CHECK: retq
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#[no_mangle]
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pub fn old_style(a: *mut u8) -> *mut u8 {
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(a as usize | 1) as *mut u8
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}
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// CHECK-LABEL: cheri_compat
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// CHECK: movq %{{.*}}, %rax
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// CHECK: orq $1, %rax
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// CHECK: retq
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#[no_mangle]
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pub fn cheri_compat(a: *mut u8) -> *mut u8 {
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let old = a as usize;
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let new = old | 1;
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let diff = new.wrapping_sub(old);
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a.wrapping_add(diff)
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}
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// CHECK-LABEL: definitely_not_a_null_pointer
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// CHECK: movq %{{.*}}, %rax
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// CHECK: orq $1, %rax
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// CHECK: retq
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#[no_mangle]
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pub fn definitely_not_a_null_pointer(a: *mut u8) -> *mut u8 {
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let old = a as usize;
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let new = old | 1;
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a.wrapping_sub(old).wrapping_add(new)
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}
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