misc/math/testSHIFTbits.py at be926d3ed018b1fde8ae62b95ba875a17af11c45 · daedalus/misc · GitHub

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#!/usr/bin/env python
# Author Dario Clavijo 2018


def SRA(val, n):
    s = val & 0x80000000
    for _ in range(0, n):
        val >>= 1
        val |= s
    return val


def SLL(val, n):
    s = val & 0x80000000
    for _ in range(0, n):
        val <<= 1
    return val & 0xFFFFFFFF


def SRL(val, n):
    s = val & 0x80000000
    for _ in range(0, n):
        val >>= 1
    return val & 0xFFFFFFFF


def bitrepr32(val):
    return bin(val).replace("0b", "").zfill(32)


def test(a, n):
    print("BIT:", bitrepr32(a))
    print("SRA:", bitrepr32(SRA(a, n)), n)
    print("SRL:", bitrepr32(SRL(a, n)), n)
    print("SLL:", bitrepr32(SLL(a, n)), n)


n = 5
a = 0b11111111111111110000000000000000
test(a, 5)
n = 5
a = 0b00000000000000001111111111111111
test(a, 5)
a = 0b00000000111111111111111100000000
test(a, 5)