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| author | Paul Sokolovsky <pfalcon@users.sourceforge.net> | 2014-02-22 16:39:45 +0200 |
|---|---|---|
| committer | Paul Sokolovsky <pfalcon@users.sourceforge.net> | 2014-02-22 16:39:45 +0200 |
| commit | 56e5ef203b01ac8dfb1cb46143f6f7c53237b79d (patch) | |
| tree | a1c2267a2e6b657d29be82ac177f21e74af24707 /tests/basics/int-small.py | |
| parent | bbf0e2fe120f095ce09fcb7eb631c9fd04bd9760 (diff) | |
| download | micropython-56e5ef203b01ac8dfb1cb46143f6f7c53237b79d.tar.gz micropython-56e5ef203b01ac8dfb1cb46143f6f7c53237b79d.zip | |
parse: Refactor parse node encoding to support full range of small ints.
Based on suggestion by @dpgeorge at
https://github.com/micropython/micropython/pull/313
Diffstat (limited to 'tests/basics/int-small.py')
| -rw-r--r-- | tests/basics/int-small.py | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/tests/basics/int-small.py b/tests/basics/int-small.py index 53902c7e39..102dac8ae7 100644 --- a/tests/basics/int-small.py +++ b/tests/basics/int-small.py @@ -1,5 +1,29 @@ # 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 + a = 0x3fffff print(a) a *= 0x10 |