micropython: add micropython component

components/language/micropython/tests/basics/int_small.py

@@ -0,0 +1,84 @@
+# This tests small int range for 32-bit machine
+
+# Small ints are variable-length encoded in MicroPython, so first
+# test that encoding works as expected.
+
+print(0)
+print(1)
+print(-1)
+# Value is split in 7-bit "subwords", and taking into account that all
+# ints in Python are signed, there're 6 bits of magnitude. So, around 2^6
+# there's "turning point"
+print(63)
+print(64)
+print(65)
+print(-63)
+print(-64)
+print(-65)
+# Maximum values of small ints on 32-bit platform
+print(1073741823)
+# Per python semantics, lexical integer is without a sign (i.e. positive)
+# and '-' is unary minus operation applied to it. That's why -1073741824
+# (min two-complement's negative value) is not allowed.
+print(-1073741823)
+
+# Operations tests
+
+# compile-time constexprs
+print(1 + 3)
+print(3 - 2)
+print(2 * 3)
+print(1 & 3)
+print(1 | 2)
+print(1 ^ 3)
+print(+3)
+print(-3)
+print(~3)
+
+a = 0x3fffff
+print(a)
+a *= 0x10
+print(a)
+a *= 0x10
+print(a)
+a += 0xff
+print(a)
+# This would overflow
+#a += 1
+
+a = -0x3fffff
+print(a)
+a *= 0x10
+print(a)
+a *= 0x10
+print(a)
+a -= 0xff
+print(a)
+# This still doesn't overflow
+a -= 1
+print(a)
+# This would overflow
+#a -= 1
+
+# negative shifts are not allowed
+try:
+    a << -1
+except ValueError:
+    print("ValueError")
+try:
+    a >> -1
+except ValueError:
+    print("ValueError")
+
+# Shifts to big amounts are undefined behavior in C and is CPU-specific
+
+# These are compile-time constexprs
+print(1 >> 32)
+print(1 >> 64)
+print(1 >> 128)
+
+# These are runtime calcs
+a = 1
+print(a >> 32)
+print(a >> 64)
+print(a >> 128)