unroll2.js - mozsearch

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// |jit-test| test-also=--setpref=wasm_unroll_loops=true

// Loop unrolling test: 0 exiting values, 1 exit target => can be unrolled.

let t = `

(module

  (memory (export "mem") 1)

  (func (export "my_memset")

        (param $start i32) (param $byte i32) (param $count i32)

    (local $limit i32)

    (local.set $limit (i32.add (local.get $start) (local.get $count)))

    (if (i32.lt_u (local.get $start) (local.get $limit))

      (then

        (loop $cont

          (i32.store8 (local.get $start) (local.get $byte))

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

          (br_if $cont (i32.lt_u (local.get $start) (local.get $limit)))

)`;

let i = new WebAssembly.Instance(new WebAssembly.Module(wasmTextToBinary(t)));

i.exports.my_memset(1, 22, 1);

i.exports.my_memset(3, 33, 2);

i.exports.my_memset(6, 44, 3);

i.exports.my_memset(10, 55, 4);

i.exports.my_memset(15, 66, 5);

i.exports.my_memset(21, 77, 6);

i.exports.my_memset(28, 88, 7);

i.exports.my_memset(36, 99, 8);

let buf = new Uint8Array(i.exports.mem.buffer);

let s = "";

for (let i = 0; i < 45; i++) {

    s = s + (buf[i] + " ");

let expected =

    "0 22 0 33 33 0 44 44 44 0 55 55 55 55 0 66 66 66 66 66 0 77 77 77 " +

    "77 77 77 0 88 88 88 88 88 88 88 0 99 99 99 99 99 99 99 99 0 ";

assertEq(s, expected);