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[Bug c/78135] In an unsigned long (64 bit) 1<<31 gives rubbish
- From: "pinskia at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 27 Oct 2016 16:39:07 +0000
- Subject: [Bug c/78135] In an unsigned long (64 bit) 1<<31 gives rubbish
- Auto-submitted: auto-generated
- References: <bug-78135-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78135
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Also:
printf("\n Finally: 0x%016lx, how silly can you get?\n",
(unsigned long)((1 << 24) << 7));
This is undefined as shifting into the sign bit is undefined.
use instead:
printf("\n Finally: 0x%016lx, how silly can you get?\n",
(unsigned long)((1ul << 24) << 7));