f35a2bd401
Turn `is_val_statically_known` into such an intrinsic to demonstrate. It is perfectly safe to call after all.
87 lines
1.5 KiB
Rust
87 lines
1.5 KiB
Rust
// compile-flags: --crate-type=lib -Zmerge-functions=disabled -O
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#![feature(core_intrinsics)]
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use std::intrinsics::is_val_statically_known;
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pub struct A(u32);
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pub enum B {
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Ye(u32),
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}
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#[inline]
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pub fn _u32(a: u32) -> i32 {
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if is_val_statically_known(a) { 1 } else { 0 }
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}
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// CHECK-LABEL: @_u32_true(
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#[no_mangle]
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pub fn _u32_true() -> i32 {
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// CHECK: ret i32 1
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_u32(1)
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}
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// CHECK-LABEL: @_u32_false(
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#[no_mangle]
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pub fn _u32_false(a: u32) -> i32 {
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// CHECK: ret i32 0
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_u32(a)
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}
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#[inline]
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pub fn _bool(b: bool) -> i32 {
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if is_val_statically_known(b) { 3 } else { 2 }
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}
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// CHECK-LABEL: @_bool_true(
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#[no_mangle]
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pub fn _bool_true() -> i32 {
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// CHECK: ret i32 3
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_bool(true)
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}
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// CHECK-LABEL: @_bool_false(
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#[no_mangle]
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pub fn _bool_false(b: bool) -> i32 {
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// CHECK: ret i32 2
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_bool(b)
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}
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#[inline]
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pub fn _iref(a: &u8) -> i32 {
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if unsafe { is_val_statically_known(a) } { 5 } else { 4 }
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}
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// CHECK-LABEL: @_iref_borrow(
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#[no_mangle]
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pub fn _iref_borrow() -> i32 {
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// CHECK: ret i32 4
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_iref(&0)
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}
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// CHECK-LABEL: @_iref_arg(
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#[no_mangle]
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pub fn _iref_arg(a: &u8) -> i32 {
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// CHECK: ret i32 4
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_iref(a)
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}
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#[inline]
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pub fn _slice_ref(a: &[u8]) -> i32 {
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if unsafe { is_val_statically_known(a) } { 7 } else { 6 }
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}
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// CHECK-LABEL: @_slice_ref_borrow(
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#[no_mangle]
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pub fn _slice_ref_borrow() -> i32 {
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// CHECK: ret i32 6
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_slice_ref(&[0;3])
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}
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// CHECK-LABEL: @_slice_ref_arg(
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#[no_mangle]
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pub fn _slice_ref_arg(a: &[u8]) -> i32 {
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// CHECK: ret i32 6
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_slice_ref(a)
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}
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