carbon-lang/toolchain/check/testdata/builtins/int/smod.carbon

// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
// EXTRA-ARGS: --no-dump-sem-ir
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/builtins/int/smod.carbon
// TIP: To dump output, run:
// TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/builtins/int/smod.carbon

// --- int_div.carbon

fn Mod(a: i32, b: i32) -> i32 = "int.smod";

var arr: [i32; Mod(5, 3)];
let arr_p: [i32; 2]* = &arr;

fn RuntimeCallIsValid(a: i32, b: i32) -> i32 {
  return Mod(a, b);
}

// --- fail_overflow.carbon

package FailOverflow;

fn Mod(a: i32, b: i32) -> i32 = "int.smod";
fn Sub(a: i32, b: i32) -> i32 = "int.ssub";
fn Negate(a: i32) -> i32 = "int.snegate";

// -0x7FFF_FFFF % -1 is OK.
let a: i32 = Mod(Negate(0x7FFF_FFFF), Negate(1));

// -0x8000_0000 % 1 is OK.
let b: i32 = Mod(Sub(Negate(0x7FFF_FFFF), 1), 1);

// -0x8000_0000 / -1 overflows, so -0x8000_0000 % -1 is disallowed, even though
// its result is representable.
// CHECK:STDERR: fail_overflow.carbon:[[@LINE+4]]:14: error: integer overflow in calculation `-2147483648 % -1` [CompileTimeIntegerOverflow]
// CHECK:STDERR: let c: i32 = Mod(Sub(Negate(0x7FFF_FFFF), 1), Negate(1));
// CHECK:STDERR:              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
let c: i32 = Mod(Sub(Negate(0x7FFF_FFFF), 1), Negate(1));

// --- fail_div_by_zero.carbon

package FailDivByZero;

fn Mod(a: i32, b: i32) -> i32 = "int.smod";

// Remainder of division by zero is not defined.

// CHECK:STDERR: fail_div_by_zero.carbon:[[@LINE+4]]:14: error: division by zero [CompileTimeDivisionByZero]
// CHECK:STDERR: let a: i32 = Mod(1, 0);
// CHECK:STDERR:              ^~~~~~~~~
// CHECK:STDERR:
let a: i32 = Mod(1, 0);

// CHECK:STDERR: fail_div_by_zero.carbon:[[@LINE+4]]:14: error: division by zero [CompileTimeDivisionByZero]
// CHECK:STDERR: let b: i32 = Mod(0, 0);
// CHECK:STDERR:              ^~~~~~~~~
// CHECK:STDERR:
let b: i32 = Mod(0, 0);