tests/codegen-llvm/array-equality.rs

//@ revisions: llvm-current llvm-next
//@[llvm-current] max-llvm-major-version: 22
//@[llvm-next] min-llvm-version: 23
//@ compile-flags: -Copt-level=3 -Z merge-functions=disabled
//@ only-x86_64
#![crate_type = "lib"]

// CHECK-LABEL: @array_eq_value
#[no_mangle]
pub fn array_eq_value(a: [u16; 3], b: [u16; 3]) -> bool {
    // CHECK-NEXT: start:
    // CHECK-NEXT: %_0 = icmp eq i48 %0, %1
    // CHECK-NEXT: ret i1 %_0
    a == b
}

// CHECK-LABEL: @array_eq_ref
#[no_mangle]
pub fn array_eq_ref(a: &[u16; 3], b: &[u16; 3]) -> bool {
    // CHECK: start:
    // CHECK: load i48, ptr %{{.+}}, align 2
    // CHECK: load i48, ptr %{{.+}}, align 2
    // CHECK: icmp eq i48
    // CHECK-NEXT: ret
    a == b
}

// CHECK-LABEL: @array_eq_value_still_passed_by_pointer
#[no_mangle]
pub fn array_eq_value_still_passed_by_pointer(a: [u16; 9], b: [u16; 9]) -> bool {
    // CHECK-NEXT: start:
    // CHECK-NOT: alloca
    // llvm-current-NEXT: %[[CMP:.+]] = tail call i32 @{{bcmp|memcmp}}(ptr
    // llvm-current-SAME: {{.*}} dereferenceable(18) %{{.+}}, ptr {{.*}} dereferenceable(18)
    // llvm-current-SAME: %{{.+}}, i64 18)
    // llvm-current-NEXT: %[[EQ:.+]] = icmp eq i32 %[[CMP]], 0
    // llvm-current-NEXT: ret i1 %[[EQ]]
    // CHECK-NOT: call
    // New LLVM expands the bcmp earlier, so this becomes wide reads + icmp
    // No allocas or calls, and at least one icmp
    // llvm-next: icmp
    // CHECK-NOT: alloca
    // CHECK-NOT: call
    a == b
}

// CHECK-LABEL: @array_eq_long
#[no_mangle]
pub fn array_eq_long(a: &[u16; 1234], b: &[u16; 1234]) -> bool {
    // CHECK-NEXT: start:
    // CHECK: %[[CMP:.+]] = tail call i32 @{{bcmp|memcmp}}(ptr {{.*}} dereferenceable(2468) %{{.+}}, ptr {{.*}} dereferenceable(2468) %{{.+}}, i64 2468)
    // CHECK-NEXT: %[[EQ:.+]] = icmp eq i32 %[[CMP]], 0
    // CHECK-NEXT: ret i1 %[[EQ]]
    a == b
}

// CHECK-LABEL: @array_char_eq
#[no_mangle]
pub fn array_char_eq(a: [char; 2], b: [char; 2]) -> bool {
    // CHECK-NEXT: start:
    // CHECK-NEXT: %[[EQ:.+]] = icmp eq i64 %0, %1
    // CHECK-NEXT: ret i1 %[[EQ]]
    a == b
}

// CHECK-LABEL: @array_eq_zero_short(i48
#[no_mangle]
pub fn array_eq_zero_short(x: [u16; 3]) -> bool {
    // CHECK-NEXT: start:
    // CHECK-NEXT: %[[EQ:.+]] = icmp eq i48 %0, 0
    // CHECK-NEXT: ret i1 %[[EQ]]
    x == [0; 3]
}

// CHECK-LABEL: @array_eq_none_short(i40
#[no_mangle]
pub fn array_eq_none_short(x: [Option<std::num::NonZero<u8>>; 5]) -> bool {
    // CHECK-NEXT: start:
    // CHECK-NEXT: %[[EQ:.+]] = icmp eq i40 %0, 0
    // CHECK-NEXT: ret i1 %[[EQ]]
    x == [None; 5]
}

// CHECK-LABEL: @array_eq_zero_nested(
#[no_mangle]
pub fn array_eq_zero_nested(x: [[u8; 3]; 3]) -> bool {
    // CHECK: %[[VAL:.+]] = load i72
    // CHECK-SAME: align 1
    // CHECK: %[[EQ:.+]] = icmp eq i72 %[[VAL]], 0
    // CHECK: ret i1 %[[EQ]]
    x == [[0; 3]; 3]
}

// CHECK-LABEL: @array_eq_zero_mid(
#[no_mangle]
pub fn array_eq_zero_mid(x: [u16; 8]) -> bool {
    // CHECK-NEXT: start:
    // CHECK: %[[LOAD:.+]] = load i128,
    // CHECK-NEXT: %[[EQ:.+]] = icmp eq i128 %[[LOAD]], 0
    // CHECK-NEXT: ret i1 %[[EQ]]
    x == [0; 8]
}

// CHECK-LABEL: @array_eq_zero_long(
#[no_mangle]
pub fn array_eq_zero_long(x: [u16; 1234]) -> bool {
    // CHECK-NEXT: start:
    // CHECK-NOT: alloca
    // CHECK: %[[CMP:.+]] = tail call i32 @{{bcmp|memcmp}}(
    // CHECK-NEXT: %[[EQ:.+]] = icmp eq i32 %[[CMP]], 0
    // CHECK-NEXT: ret i1 %[[EQ]]
    x == [0; 1234]
}