From mboxrd@z Thu Jan  1 00:00:00 1970
To: 9fans@cse.psu.edu
From: "Douglas A. Gwyn" <DAGwyn@null.net>
Message-ID: <3B512D07.97B5B213@null.net>
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References: <200107140326.f6E3Q7j03750@ducky.net>
Subject: Re: [9fans] another compiler bug (another try to send this coherently)
Date: Mon, 16 Jul 2001 09:05:43 +0000
Topicbox-Message-UUID: ce965bb8-eac9-11e9-9e20-41e7f4b1d025

Mike Haertel wrote:
> On a conforming implementation with 32-bit ints, this
> program should print "-1 -1".
>         static unsigned char tab[1] = { 0x80 };
>         static int x = 0x80;
>         printf("%d %d\n", tab[0] << 24 >> 31, x << 24 >> 31);

How do you figure that?  The promoted tab[0] (signed int) or x
left-shifted 24 places sets the sign bit, and right-shifting a
negative value is implementation-defined.