Re: [Tinycc-devel] [PATCH] tccgen.c: Optimise 0<<x, 0>>x, -1>>x, x&0, x*

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Re: [Tinycc-devel] [PATCH] tccgen.c: Optimise 0<<x, 0>>x, -1>>x, x&0, x*

From:	Vincent Lefevre
Subject:	Re: [Tinycc-devel] [PATCH] tccgen.c: Optimise 0<<x, 0>>x, -1>>x, x&0, x*0, x\|-1, x%1.
Date:	Fri, 6 Mar 2015 12:58:36 +0100
User-agent:	Mutt/1.5.23-6424-vl-r76280 (2015-02-19)

On 2015-03-06 10:38:11 +0000, Edmund Grimley Evans wrote:
> In general it is not allowed to write to one union member then
> read from another and I don't know of an exception that covers
> this particular case.

It is legal: https://en.wikipedia.org/wiki/Type_punning#Use_of_union

-- 
Vincent Lefèvre <address@hidden> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)

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[Tinycc-devel] [PATCH] tccgen.c: Optimise 0<<x, 0>>x, -1>>x, x&0, x*0, x|-1, x%1., Edmund Grimley Evans, 2015/03/05
- Re: [Tinycc-devel] [PATCH] tccgen.c: Optimise 0<<x, 0>>x, -1>>x, x&0, x*0, x|-1, x%1., Sergey Korshunoff, 2015/03/06
  - Re: [Tinycc-devel] [PATCH] tccgen.c: Optimise 0<<x, 0>>x, -1>>x, x&0, x*0, x|-1, x%1., Edmund Grimley Evans, 2015/03/06
    - Re: [Tinycc-devel] [PATCH] tccgen.c: Optimise 0<<x, 0>>x, -1>>x, x&0, x*0, x|-1, x%1., Sergey Korshunoff, 2015/03/06
    - Re: [Tinycc-devel] [PATCH] tccgen.c: Optimise 0<<x, 0>>x, -1>>x, x&0, x*0, x|-1, x%1., Sergey Korshunoff, 2015/03/06
    - Re: [Tinycc-devel] [PATCH] tccgen.c: Optimise 0<<x, 0>>x, -1>>x, x&0, x*0, x|-1, x%1., Edmund Grimley Evans, 2015/03/06
    - Re: [Tinycc-devel] [PATCH] tccgen.c: Optimise 0<<x, 0>>x, -1>>x, x&0, x*0, x|-1, x%1., Sergey Korshunoff, 2015/03/06
    - Re: [Tinycc-devel] [PATCH] tccgen.c: Optimise 0<<x, 0>>x, -1>>x, x&0, x*0, x|-1, x%1., Edmund Grimley Evans, 2015/03/06
    - Re: [Tinycc-devel] [PATCH] tccgen.c: Optimise 0<<x, 0>>x, -1>>x, x&0, x*0, x|-1, x%1., Vincent Lefevre <=
- Re: [Tinycc-devel] [PATCH] tccgen.c: Optimise 0<<x, 0>>x, -1>>x, x&0, x*0, x|-1, x%1., Vincent Lefevre, 2015/03/06
  - Re: [Tinycc-devel] [PATCH] tccgen.c: Optimise 0<<x, 0>>x, -1>>x, x&0, x*0, x|-1, x%1., Edmund Grimley Evans, 2015/03/06
    - Re: [Tinycc-devel] [PATCH] tccgen.c: Optimise 0<<x, 0>>x, -1>>x, x&0, x*0, x|-1, x%1., Edmund Grimley Evans, 2015/03/06
    - Re: [Tinycc-devel] [PATCH] tccgen.c: Optimise 0<<x, 0>>x, -1>>x, x&0, x*0, x|-1, x%1., Sergey Korshunoff, 2015/03/06
    - Re: [Tinycc-devel] [PATCH] tccgen.c: Optimise 0<<x, 0>>x, -1>>x, x&0, x*0, x|-1, x%1., Vincent Lefevre, 2015/03/06
    - Re: [Tinycc-devel] [PATCH] tccgen.c: Optimise 0<<x, 0>>x, -1>>x, x&0, x*0, x|-1, x%1., Edmund Grimley Evans, 2015/03/07

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