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// compile-flags: -O -Z merge-functions=disabled
// no-system-llvm
// ignore-debug (the extra assertions get in the way)
#![crate_type = "lib"]
// Ensure that various forms of reading pointers correctly annotate the `load`s
// with `!noundef` and `!range` metadata to enable extra optimization.
use std::mem::MaybeUninit;
// CHECK-LABEL: define noundef i8 @copy_byte(
#[no_mangle]
pub unsafe fn copy_byte(p: *const u8) -> u8 {
// CHECK-NOT: load
// CHECK: load i8, ptr %p, align 1
// CHECK-SAME: !noundef !
// CHECK-NOT: load
*p
}
// CHECK-LABEL: define noundef i8 @read_byte(
#[no_mangle]
pub unsafe fn read_byte(p: *const u8) -> u8 {
// CHECK-NOT: load
// CHECK: load i8, ptr %p, align 1
// CHECK-SAME: !noundef !
// CHECK-NOT: load
p.read()
}
// CHECK-LABEL: define i8 @read_byte_maybe_uninit(
#[no_mangle]
pub unsafe fn read_byte_maybe_uninit(p: *const MaybeUninit<u8>) -> MaybeUninit<u8> {
// CHECK-NOT: load
// CHECK: load i8, ptr %p, align 1
// CHECK-NOT: noundef
// CHECK-NOT: load
p.read()
}
// CHECK-LABEL: define noundef i8 @read_byte_assume_init(
#[no_mangle]
pub unsafe fn read_byte_assume_init(p: &MaybeUninit<u8>) -> u8 {
// CHECK-NOT: load
// CHECK: load i8, ptr %p, align 1
// CHECK-SAME: !noundef !
// CHECK-NOT: load
p.assume_init_read()
}
// CHECK-LABEL: define noundef i32 @copy_char(
#[no_mangle]
pub unsafe fn copy_char(p: *const char) -> char {
// CHECK-NOT: load
// CHECK: load i32, ptr %p
// CHECK-SAME: !range ![[RANGE:[0-9]+]]
// CHECK-SAME: !noundef !
// CHECK-NOT: load
*p
}
// CHECK-LABEL: define noundef i32 @read_char(
#[no_mangle]
pub unsafe fn read_char(p: *const char) -> char {
// CHECK-NOT: load
// CHECK: load i32, ptr %p
// CHECK-SAME: !range ![[RANGE]]
// CHECK-SAME: !noundef !
// CHECK-NOT: load
p.read()
}
// CHECK-LABEL: define i32 @read_char_maybe_uninit(
#[no_mangle]
pub unsafe fn read_char_maybe_uninit(p: *const MaybeUninit<char>) -> MaybeUninit<char> {
// CHECK-NOT: load
// CHECK: load i32, ptr %p
// CHECK-NOT: range
// CHECK-NOT: noundef
// CHECK-NOT: load
p.read()
}
// CHECK-LABEL: define noundef i32 @read_char_assume_init(
#[no_mangle]
pub unsafe fn read_char_assume_init(p: &MaybeUninit<char>) -> char {
// CHECK-NOT: load
// CHECK: load i32, ptr %p
// CHECK-SAME: !range ![[RANGE]]
// CHECK-SAME: !noundef !
// CHECK-NOT: load
p.assume_init_read()
}
// CHECK: ![[RANGE]] = !{i32 0, i32 1114112}
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