Test i64 math only in wasm2js mode (#20791)

test/test_core.py

@@ -134,6 +134,10 @@ def decorated(f):
   return decorated
 
 
+# Some tests are marked as only-wasm2js because they test basic codegen in a way
+# that is mainly useful for the wasm2js compiler and not LLVM. LLVM tests its
+# own codegen, while wasm2js testing is split between the binaryen repo (which
+# tests wat files) and this repo (which tests C/C++ files).
 def only_wasm2js(note=''):
   assert not callable(note)
 
@@ -452,60 +456,76 @@ def test_int53_convertI32PairToI53Checked(self):
     else:
       self.do_core_test('test_convertI32PairToI53Checked.cpp', interleaved_output=False)
 
+  @only_wasm2js('test shifts etc. on 64-bit integers')
   def test_i64(self):
     self.do_core_test('test_i64.c')
 
+  @only_wasm2js('test shifts etc. on 64-bit integers')
   def test_i64_2(self):
     self.do_core_test('test_i64_2.cpp')
 
+  @only_wasm2js('test shifts etc. on 64-bit integers')
   def test_i64_3(self):
     self.do_core_test('test_i64_3.cpp')
 
+  @only_wasm2js('test shifts etc. on 64-bit integers')
   def test_i64_4(self):
     # stuff that also needs sign corrections
-
     self.do_core_test('test_i64_4.c')
 
+  @only_wasm2js('test shifts etc. on 64-bit integers')
   def test_i64_b(self):
     self.do_core_test('test_i64_b.cpp')
 
+  @only_wasm2js('test shifts etc. on 64-bit integers')
   def test_i64_cmp(self):
     self.do_core_test('test_i64_cmp.cpp')
 
+  @only_wasm2js('test shifts etc. on 64-bit integers')
   def test_i64_cmp2(self):
     self.do_core_test('test_i64_cmp2.c')
 
+  @only_wasm2js('test unions of i64 and double')
   def test_i64_double(self):
     self.do_core_test('test_i64_double.cpp')
 
+  @only_wasm2js('test 64-bit multiply')
   def test_i64_umul(self):
     self.do_core_test('test_i64_umul.c')
 
+  @only_wasm2js('test 64-bit math')
   @also_with_standalone_wasm()
   @no_ubsan('contains UB')
   def test_i64_precise(self):
     self.do_core_test('test_i64_precise.c')
 
+  @only_wasm2js('test 64-bit multiply')
   def test_i64_precise_needed(self):
     self.do_core_test('test_i64_precise_needed.c')
 
   def test_i64_llabs(self):
+    # test the libc llabs() method
     self.do_core_test('test_i64_llabs.c')
 
   def test_i64_zextneg(self):
+    # test zero/sign-extension in printf arguments
     self.do_core_test('test_i64_zextneg.c')
 
+  @only_wasm2js('test 64-bit math')
   def test_i64_7z(self):
     # needs to flush stdio streams
     self.set_setting('EXIT_RUNTIME')
     self.do_core_test('test_i64_7z.c', args=['hallo'])
 
+  @only_wasm2js('test 64-bit math with short values')
   def test_i64_i16(self):
     self.do_core_test('test_i64_i16.c')
 
+  @only_wasm2js('test 64-bit/double conversions')
   def test_i64_qdouble(self):
     self.do_core_test('test_i64_qdouble.c')
 
+  @only_wasm2js('tests va_arg() with i64 params')
   def test_i64_varargs(self):
     self.do_core_test('test_i64_varargs.c', args='waka fleefl asdfasdfasdfasdf'.split())