70 lines
2.1 KiB
Rust
70 lines
2.1 KiB
Rust
// compile-flags: -O
|
|
// ignore-debug (because unchecked is checked in debug)
|
|
|
|
#![crate_type = "lib"]
|
|
#![feature(unchecked_shifts)]
|
|
|
|
// CHECK-LABEL: @unchecked_shl_unsigned_same
|
|
#[no_mangle]
|
|
pub unsafe fn unchecked_shl_unsigned_same(a: u32, b: u32) -> u32 {
|
|
// CHECK-NOT: assume
|
|
// CHECK-NOT: and i32
|
|
// CHECK: shl i32 %a, %b
|
|
// CHECK-NOT: and i32
|
|
a.unchecked_shl(b)
|
|
}
|
|
|
|
// CHECK-LABEL: @unchecked_shl_unsigned_smaller
|
|
#[no_mangle]
|
|
pub unsafe fn unchecked_shl_unsigned_smaller(a: u16, b: u32) -> u16 {
|
|
// This uses -DAG to avoid failing on irrelevant reorderings,
|
|
// like emitting the truncation earlier.
|
|
|
|
// CHECK-DAG: %[[INRANGE:.+]] = icmp ult i32 %b, 65536
|
|
// CHECK-DAG: tail call void @llvm.assume(i1 %[[INRANGE]])
|
|
// CHECK-DAG: %[[TRUNC:.+]] = trunc i32 %b to i16
|
|
// CHECK-DAG: shl i16 %a, %[[TRUNC]]
|
|
a.unchecked_shl(b)
|
|
}
|
|
|
|
// CHECK-LABEL: @unchecked_shl_unsigned_bigger
|
|
#[no_mangle]
|
|
pub unsafe fn unchecked_shl_unsigned_bigger(a: u64, b: u32) -> u64 {
|
|
// CHECK-NOT: assume
|
|
// CHECK: %[[EXT:.+]] = zext i32 %b to i64
|
|
// CHECK: shl i64 %a, %[[EXT]]
|
|
a.unchecked_shl(b)
|
|
}
|
|
|
|
// CHECK-LABEL: @unchecked_shr_signed_same
|
|
#[no_mangle]
|
|
pub unsafe fn unchecked_shr_signed_same(a: i32, b: u32) -> i32 {
|
|
// CHECK-NOT: assume
|
|
// CHECK-NOT: and i32
|
|
// CHECK: ashr i32 %a, %b
|
|
// CHECK-NOT: and i32
|
|
a.unchecked_shr(b)
|
|
}
|
|
|
|
// CHECK-LABEL: @unchecked_shr_signed_smaller
|
|
#[no_mangle]
|
|
pub unsafe fn unchecked_shr_signed_smaller(a: i16, b: u32) -> i16 {
|
|
// This uses -DAG to avoid failing on irrelevant reorderings,
|
|
// like emitting the truncation earlier.
|
|
|
|
// CHECK-DAG: %[[INRANGE:.+]] = icmp ult i32 %b, 32768
|
|
// CHECK-DAG: tail call void @llvm.assume(i1 %[[INRANGE]])
|
|
// CHECK-DAG: %[[TRUNC:.+]] = trunc i32 %b to i16
|
|
// CHECK-DAG: ashr i16 %a, %[[TRUNC]]
|
|
a.unchecked_shr(b)
|
|
}
|
|
|
|
// CHECK-LABEL: @unchecked_shr_signed_bigger
|
|
#[no_mangle]
|
|
pub unsafe fn unchecked_shr_signed_bigger(a: i64, b: u32) -> i64 {
|
|
// CHECK-NOT: assume
|
|
// CHECK: %[[EXT:.+]] = zext i32 %b to i64
|
|
// CHECK: ashr i64 %a, %[[EXT]]
|
|
a.unchecked_shr(b)
|
|
}
|