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Re: PATCH: Define MALLOC_ALIGNMENT as 16 for x32

From: Roland McGrath <roland at hack dot frob dot com>
To: "H.J. Lu" <hjl dot tools at gmail dot com>
Cc: GNU C Library <libc-alpha at sourceware dot org>
Date: Tue, 15 May 2012 10:40:56 -0700 (PDT)
Subject: Re: PATCH: Define MALLOC_ALIGNMENT as 16 for x32
References: <20120515144111.GA32527@intel.com><20120515170409.9D88F2C08B@topped-with-meat.com><CAMe9rOox-V_ZWkp9ykfwHbmk=nOXjVhOF=2wDiRGGsF6+dGhUw@mail.gmail.com>

> Will it change malloc alignment for i386?

No, since SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_16) will be true for any
configuration that existed before 2.16.

> X32 MALLOC_ALIGNMENT == 16 is specified in x32 psABI. 

So is __alignof__ (long double) == 16.

> Malloc doesn't need to guess it.  

It's not a guess.  It's an algorithm.

Follow-Ups:
- Re: PATCH: Define MALLOC_ALIGNMENT as 16 for x32
  - From: H.J. Lu

References:
- PATCH: Define MALLOC_ALIGNMENT as 16 for x32
  - From: H.J. Lu
- Re: PATCH: Define MALLOC_ALIGNMENT as 16 for x32
  - From: Roland McGrath
- Re: PATCH: Define MALLOC_ALIGNMENT as 16 for x32
  - From: H.J. Lu

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