Function MakeBody

deps/v8/test/mjsunit/wasm/simd-relaxed-lane-select.js:11–32

(lane_width)

const builder = new WasmModuleBuilder();

function MakeBody(lane_width) {
  let select_instr = lane_width == 8 ? kExprI8x16RelaxedLaneSelect :
                     lane_width == 16 ? kExprI16x8RelaxedLaneSelect :
                     lane_width == 32 ? kExprI32x4RelaxedLaneSelect :
                     lane_width == 64 ? kExprI64x2RelaxedLaneSelect : null;
  assertNotNull(select_instr);
  return [
    // Value A: all 0-bits.
    kExprI32Const, 0x00,
    kSimdPrefix, kExprI8x16Splat,
    // Value B: all 1-bits.
    ...wasmI32Const(0xFF),
    kSimdPrefix, kExprI8x16Splat,
    // Mask: a wild mix of bit patterns.
    ...wasmS128Const([0x80, 0x7F, 0xC0, 0x3F, 0x40, 0x9F, 0x20, 0x1F,
                      0x70, 0xA0, 0xFF, 0x00, 0xFF, 0xFF, 0x10, 0x01]),
    // The main point of the test: use the mask to select lanes.
    kSimdPrefix, ...select_instr,
    // Let's see which lanes were selected for each byte.
    kSimdPrefix, kExprI8x16BitMask, 0x01,
  ];
}

builder.addFunction('test8', kSig_i_v).exportFunc().addBody(MakeBody(8));
builder.addFunction('test16', kSig_i_v).exportFunc().addBody(MakeBody(16));