Re: bug in ceillog2 macro (Lua-5.1.4)

Subject: Re: bug in ceillog2 macro (Lua-5.1.4)
From: liam mail &lt;liam.list@<a href="/index.cgi/contrast/http://lua-users.org/cgi-bin/echo.cgi?googlemail.com">... &gt;
Date: Fri, 7 Jan 2011 14:57:03 +0000

On 7 January 2011 14:41, Leo Razoumov <slonik.az@gmail.com> wrote:

Hi List,
In Lua-5.1.4 macro

#define ceillog2(x) (luaO_log2((x)-1) + 1)

gives wrong answer when x is 0.
ceillog2(0) => 32 (should be 1).

Unless my maths fails me isn't log2(0) infinity or undefined?

Liam

Follow-Ups:
- Re: bug in ceillog2 macro (Lua-5.1.4), Erik Lindroos
- Re: bug in ceillog2 macro (Lua-5.1.4), Leo Razoumov