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https://github.com/rust-lang/rust.git
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Scott McMurray
ba1a33e105
Currently we pick "weird" numbers like `1114112` for `None::<char>`. While that's not *wrong*, it's kinda *unnatural* -- a human wouldn't make that choice. This PR instead picks `-1` for thinge like `None::<char>` -- like clang's `WEOF` -- and `None::<bool>` and such. Any enums with more than one niched value (so not `Result` nor `Option`) remain as they were before.
96 lines
2.1 KiB
Rust
96 lines
2.1 KiB
Rust
//@ compile-flags: -Copt-level=3 -Zmerge-functions=disabled
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#![crate_type = "lib"]
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extern crate core;
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use core::cmp::Ordering;
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use core::num::NonZero;
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use core::ptr::NonNull;
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// CHECK-LABEL: @non_zero_eq
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#[no_mangle]
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pub fn non_zero_eq(l: Option<NonZero<u32>>, r: Option<NonZero<u32>>) -> bool {
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// CHECK: start:
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// CHECK-NEXT: icmp eq i32
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// CHECK-NEXT: ret i1
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l == r
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}
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// CHECK-LABEL: @non_zero_signed_eq
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#[no_mangle]
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pub fn non_zero_signed_eq(l: Option<NonZero<i64>>, r: Option<NonZero<i64>>) -> bool {
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// CHECK: start:
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// CHECK-NEXT: icmp eq i64
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// CHECK-NEXT: ret i1
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l == r
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}
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// FIXME(#49892)
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// This currently relies on a manual implementation of `PartialOrd`/`Ord` for `Option`
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// Once LLVM is better able to optimize this pattern, we can return to using a derive.
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// CHECK-LABEL: @non_zero_ord
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#[no_mangle]
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pub fn non_zero_ord(a: Option<NonZero<u32>>, b: Option<NonZero<u32>>) -> bool {
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// CHECK: start:
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// CHECK-NEXT: icmp ult i32
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// CHECK-NEXT: ret i1
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a < b
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}
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// CHECK-LABEL: @non_null_eq
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#[no_mangle]
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pub fn non_null_eq(l: Option<NonNull<u8>>, r: Option<NonNull<u8>>) -> bool {
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// CHECK: start:
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// CHECK-NEXT: icmp eq ptr
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// CHECK-NEXT: ret i1
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l == r
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}
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// CHECK-LABEL: @ordering_eq
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#[no_mangle]
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pub fn ordering_eq(l: Option<Ordering>, r: Option<Ordering>) -> bool {
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// CHECK: start:
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// CHECK-NEXT: icmp eq i8
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// CHECK-NEXT: ret i1
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l == r
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}
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#[derive(PartialEq)]
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pub enum EnumWithNiche {
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A,
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B,
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C,
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D,
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E,
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F,
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G,
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}
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// CHECK-LABEL: @niche_eq
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#[no_mangle]
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pub fn niche_eq(l: Option<EnumWithNiche>, r: Option<EnumWithNiche>) -> bool {
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// CHECK: start:
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// CHECK-NEXT: icmp eq i8
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// CHECK-NEXT: ret i1
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l == r
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}
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// CHECK-LABEL: @bool_eq
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#[no_mangle]
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pub fn bool_eq(l: Option<bool>, r: Option<bool>) -> bool {
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// CHECK: start:
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// CHECK-NEXT: icmp eq i8
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// CHECK-NEXT: ret i1
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l == r
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}
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// CHECK-LABEL: @bool_ref_eq
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#[no_mangle]
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pub fn bool_ref_eq(l: &Option<bool>, r: &Option<bool>) -> bool {
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// CHECK: start:
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// CHECK-NEXT: load i8
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// CHECK-NEXT: load i8
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// CHECK-NEXT: icmp eq i8
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// CHECK-NEXT: ret i1
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l == r
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}
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