test(math): stronger ldexp test (some is c_int as int32 only)

Author: litlighilit

src/pylib/Lib/test/test_math.nim

@@ -307,22 +307,25 @@ suite "ldexp":
       ldexp(INF, 30) == INF
       ldexp(NINF, -213) == NINF
       isnan(ldexp(NAN, 0))
-  test "large second arg":
-    for f in [1e5, 1e10]:
-      let n = int(f)
-      check:
-        ldexp(INF, -n) ==  INF
-        ldexp(NINF, -n) ==  NINF
-        ldexp(1.0, -n) ==  0.0
-        ldexp(-1.0, -n) ==  -0.0
-        ldexp(0.0, -n) ==  0.0
-        ldexp(-0.0, -n) ==  -0.0
-        isnan(math.ldexp(NAN, -n))
-      expect OverflowDefect: discard ldexp(1.0, n)
-      expect OverflowDefect: discard ldexp(-1.0, n)
-      check:
-        ldexp(0.0, n) == 0.0
-        ldexp(-0.0, n) == -0.0
-        ldexp(INF, n) == INF
-        ldexp(NINF, n) == NINF
-        isnan(ldexp(NAN, n))
+  when c_int is int32:
+    test "large second arg":
+      # the following code from CPython is only for
+      # platform where c_int is int32
+      for f in [1e5, 1e10]:
+        let n = int(f)
+        check:
+          ldexp(INF, -n) ==  INF
+          ldexp(NINF, -n) ==  NINF
+          ldexp(1.0, -n) ==  0.0
+          ldexp(-1.0, -n) ==  -0.0
+          ldexp(0.0, -n) ==  0.0
+          ldexp(-0.0, -n) ==  -0.0
+          isnan(math.ldexp(NAN, -n))
+        expect OverflowDefect: discard ldexp(1.0, n)
+        expect OverflowDefect: discard ldexp(-1.0, n)
+        check:
+          ldexp(0.0, n) == 0.0
+          ldexp(-0.0, n) == -0.0
+          ldexp(INF, n) == INF
+          ldexp(NINF, n) == NINF
+          isnan(ldexp(NAN, n))