bug2074892.js - mozsearch

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function test(op, x0, n, expected) {

  const text = `

  (module

    (func (export "f") (param $n i32) (result i32)

      (local $x i32) (local $acc i32) (local $i i32)

      (local.set $x (i32.const ${x0}))

      (loop $L

        (local.set $acc (i32.add (local.get $acc) ${op}))

        (local.set $x (local.get $n))

        (local.set $i (i32.add (local.get $i) (i32.const 1)))

        (br_if $L (i32.lt_u (local.get $i) (local.get $n))))

      (local.get $acc)))

`;

  const { exports } = new WebAssembly.Instance(

    new WebAssembly.Module(wasmTextToBinary(text))

);

  assertEq(exports.f(n), expected);

test("(i32.shr_u (local.get $x) (i32.const 0))", -1, 3, 5);

test("(i32.shr_u (local.get $x) (i32.const 32))", -1, 3, 5);

test("(i32.div_u (local.get $x) (i32.const 1))", -1, 3, 5);

test("(i32.rem_u (local.get $x) (i32.const -1))", -2, 3, 4);