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import os
from scripts.test import shared
from . import utils
class StackIRTest(utils.BinaryenTestCase):
# test that stack IR opts make a difference.
def test_stack_ir_opts(self):
path = self.input_path('stack_ir.wat')
shared_args = shared.WASM_OPT + [path, '--print-stack-ir']
# optimize level 2 will only run some of the stack IR opts. level 3 does
# noticeably more.
nonopt = shared.run_process(shared_args + ['-o', 'nonopt.wasm', '--optimize-level=2'], capture_output=True).stdout
yesopt = shared.run_process(shared_args + ['-o', 'yesopt.wasm', '--optimize-level=3'], capture_output=True).stdout
# see a difference in the printed stack IR (the optimizations let us
# remove a pair of local.set/get)
self.assertNotEqual(yesopt, nonopt)
self.assertLess(len(yesopt), len(nonopt))
# see a difference in the actual emitted wasm binary.
yesopt_size = os.path.getsize('yesopt.wasm')
nonopt_size = os.path.getsize('nonopt.wasm')
self.assertLess(yesopt_size, nonopt_size)
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