tests/decode: Rewrite in C, speed-up is >100x

tests/meson.build

@@ -1,46 +1,4 @@
 
-test_driver = executable('test_driver', 'driver.c',
-                         dependencies: fadec,
-                         c_args: ['-D_GNU_SOURCE'])
-test_args = [files('test.py'), test_driver]
-if decode_32
-  test_args += ['--32']
-endif
-if decode_64
-  test_args += ['--64']
-endif
-
-
-## Test cases
-
-testcases = [
-  ['prefixes', 'prefixes.txt'],
-  ['modrm', 'modrm.txt'],
-
-  ['enter', 'decode-enter.sh'],
-  ['imul', 'decode-imul.sh'],
-  ['inc', 'decode-inc.sh'],
-  ['jmp', 'decode-jmp.txt'],
-  ['movsx', 'decode-movsx.sh'],
-  ['ret', 'decode-ret.sh'],
-
-  ['sse-shufpd', 'decode-sse-shufpd.sh'],
-  ['sse-movq', 'decode-sse-movq.sh'],
-]
-
-foreach case : testcases
-  test(case[0], python3, args: test_args + files(case[1]))
-endforeach
-
-
-## Benchmarks
-#
-# Note that we don't use meson's benchmark function here, because it doesn't
-# give us the output we need by default.
-
-benchmarks = [
-  'benchmarks.txt',
-]
-
-run_target('benchmark_decode',
-           command: [python3, test_args, '--benchmark', files(benchmarks)])
+decode_test = executable('test_decode', 'test_decode.c',
+                         dependencies: fadec)
+test('decode', decode_test)