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Re: [PATCH] PPC32 Linuxthreads Chance MALLOC_ALIGNMENT for VMX
- From: Andreas Schwab <schwab at suse dot de>
- To: Ulrich Drepper <drepper at redhat dot com>
- Cc: sjmunroe at vnet dot ibm dot com, libc-alpha at sources dot redhat dot com
- Date: Thu, 11 Mar 2004 18:28:05 +0100
- Subject: Re: [PATCH] PPC32 Linuxthreads Chance MALLOC_ALIGNMENT for VMX
- References: <405097DF.5060806@us.ibm.com> <405099A4.3090701@redhat.com>
Ulrich Drepper <drepper@redhat.com> writes:
> Steve Munroe wrote:
>> The Altivec/VMX instructions require 16-byte alignment. So we need to
>> change the default alignment for malloc/calloc/realloc to avoid SIGILL
>> when uses malloc for vector types.
>>
>> Any problems with this change?
>
> Yes. malloc memory needs only be aligned for the standard types.
I disagree.
7.20.3 Memory management functions
1 ... The pointer returned if the allocation succeeds is suitably aligned
so that it may be assigned to a pointer to any type of object and then
used to access such an object or an array of such objects in the space
allocated (until the space is explicitly deallocated).
Andreas.
--
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux AG, Maxfeldstraße 5, 90409 Nürnberg, Germany
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