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Bug #6369 Bitwise OR does not work with negative numbers
Submitted: 2000-08-26 13:55 UTC Modified: 2000-08-26 14:17 UTC
From: jonny at 1409 dot org Assigned:
Status: Closed Package: Misbehaving function
PHP Version: 4.0.1pl2 OS: Linux 2.2.16
Private report: No CVE-ID: None
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From: jonny at 1409 dot org
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 [2000-08-26 13:55 UTC] jonny at 1409 dot org 
Bitwise OR does not work with negative numbers, example:

number 1: -123456789 (10000111010110111100110100010100)
number 2:   234567890 (00001101111110110011100011010010)

Result:
10000111010110111100110100010100
00001101111110110011100011010010
10000010000000001100010100000100

A bit in the resulting number is only set, if it's set in the first
number and NOT set in the second number!?

This does only occur if one number is negative, with two positive
numbers it works fine.

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 [2000-08-26 14:17 UTC] stas@php.net 
I wonder where do you get these values?
-123456789 is 0xf8a432eb or 11111000101001000011001011101011
the second number is right.
the result of ORing is: -33604869
which is 11111101111111110011101011111011.

Where's the problem?
 
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