mirror of https://github.com/rust-lang/rust
48 lines
1.1 KiB
Rust
48 lines
1.1 KiB
Rust
//@ assembly-output: emit-asm
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//@ compile-flags: -Copt-level=1
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//@ only-x86_64
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#![crate_type="rlib"]
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// CHECK-LABEL: align_offset_byte_ptr
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// CHECK: leaq 31
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// CHECK: andq $-32
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// CHECK: subq
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#[no_mangle]
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pub fn align_offset_byte_ptr(ptr: *const u8) -> usize {
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ptr.align_offset(32)
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}
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// CHECK-LABEL: align_offset_byte_slice
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// CHECK: leaq 31
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// CHECK: andq $-32
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// CHECK: subq
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#[no_mangle]
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pub fn align_offset_byte_slice(slice: &[u8]) -> usize {
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slice.as_ptr().align_offset(32)
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}
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// CHECK-LABEL: align_offset_word_ptr
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// CHECK: leaq 31
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// CHECK: andq $-32
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// CHECK: subq
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// CHECK: shrq
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// This `ptr` is not known to be aligned, so it is required to check if it is at all possible to
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// align. LLVM applies a simple mask.
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// CHECK: orq
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#[no_mangle]
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pub fn align_offset_word_ptr(ptr: *const u32) -> usize {
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ptr.align_offset(32)
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}
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// CHECK-LABEL: align_offset_word_slice
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// CHECK: leaq 31
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// CHECK: andq $-32
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// CHECK: subq
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// CHECK: shrq
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// `slice` is known to be aligned, so `!0` is not possible as a return
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// CHECK-NOT: orq
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#[no_mangle]
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pub fn align_offset_word_slice(slice: &[u32]) -> usize {
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slice.as_ptr().align_offset(32)
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}
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