Re: Re: #25877 [Opn]: >> operator bug for negative LOP

Sorry...my fault. I didn't noticed that the things happen at bugs.php.net. K. "Moriyoshi Koizumi" <moriyoshi@at.wakwak.com> wrote in message news:20031015230159iG3D3r@at.wakwak.com... > Although I'm not the one who first addressed this, I meant it's not a bug > but undocumented stuff. BTW, why didn't you use the recommended web > interface within the bug system instead of just replying the notification > mail? > > Moriyoshi > > "Kouber Saparev" <kouber@php.net> wrote: > > > The >>> operator exist in Java...obviously <<< have no sense, you cannot > > shift left and keep the sign bit. > > > > I don't see anything strange in the behaviour of bitwise operators: > > > > $i = 1; > > $i <<= 31; > > printf("%d\n", $i); > > > > This code outputs the same thing (-2147483648) in PHP, Perl and in C. > > However, the behaviour of the "print" operator is different in PHP and in > > Perl: > > > > print $i; > > > > This will output -2147483648 in PHP and 2147483648 in Perl. > > > > > > <moriyoshi@php.net> wrote in message > > news:20031015120023.31912.qmail@rn2.php.net... > > > ID: 25877 > > > Updated by: moriyoshi@php.net > > > Reported By: cestmirl at freeside dot sk > > > Status: Open > > > Bug Type: Documentation problem > > > Operating System: Linux Debian, Win32 > > > PHP Version: 4.3.3 > > > New Comment: > > > > > > Heh, who told me that C supports '>>>' operator... there's no > > > such > > > operator in that language. > > > > > > > > > Previous Comments: > > > ------------------------------------------------------------------------ > > > > > > [2003-10-15 07:56:56] moriyoshi@php.net > > > > > > Since PHP doesn't support unsigned shift operations that are > > > represented by '<<<' or '>>>' in the C > > > language, bit shift operations > > > are done in "sign-respectful" manner, where the most significant bit > > > will never be changed. This is expected behaviour, but not documented > > > yet. > > > > > > > > > ------------------------------------------------------------------------ > > > > > > [2003-10-15 07:40:14] cestmirl at freeside dot sk > > > > > > Description: > > > ------------ > > > Bitwise shift right operator returns negative result (most significant > > > bit set) for negative input (left operand). > > > > > > Following assert fails (though should NOT) > > > > > > assert((1 << 31 >> 31) == 1); > > > > > > Reproduce code: > > > --------------- > > > assert((1 << 31 >> 31) == 1); > > > > > > Actual result: > > > -------------- > > > assertion failed > > > > > > > > > ------------------------------------------------------------------------ > > > > > > > > > -- > > > Edit this bug report at http://bugs.php.net/?id=25877&edit=1 > > >