baseline-extend8.js

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// This attempts to test that we can do an 8-bit sign extend no matter what the

// source register.  This test is arguably somewhat tied to the baseline

// compiler's register allocator, but is still appropriate for most simple

// register allocators.  It works by filling an increasing number of registers

// with values so as eventually to force the source operand for extend8_s into a

// register that does not have a byte personality.

for ( let i=0; i < 8; i++) {

    let txt =

        `(module

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

           ${adds(i)}

           (local.set 0 (i32.extend8_s (i32.add (local.get 0) (i32.const 1))))

           ${drops(i)}

           (local.get 0)))`;

    let ins = new WebAssembly.Instance(new WebAssembly.Module(wasmTextToBinary(txt)));

    assertEq(ins.exports.f(254), -1);

function adds(n) {

    let s = ""

    for ( let i=0; i < n; i++ )

        s += "(i32.add (local.get 0) (i32.const 1))\n";

    return s;

function drops(n) {

    let s = "";

    for ( let i=0; i < n; i++ )

        s += "drop\n";

    return s;