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Re: Altivec + 16 byte alignment
- From: kenner at vlsi1 dot ultra dot nyu dot edu (Richard Kenner)
- To: Franz dot Sirl-kernel at lauterbach dot com
- Cc: gcc at gcc dot gnu dot org
- Date: Tue, 11 Feb 03 13:37:38 EST
- Subject: Re: Altivec + 16 byte alignment
BIGGEST_ALIGNMENT is 128, but STACK_BOUNDARY is 64 unless you give
-mabi=altivec (in 3.2+).
I must say that I find this confusing. Although the documentation is
unclear, I've always thought of BIGGEST_ALIGNMENT as being the largest
alignment we can guarantee and I think there's code that depends on that.
But if STACK_BOUNDARY < BIGGEST_ALIGNMENT, that's clearly not true.
Has the definition changed? If so, how *do* you find the largest
alignment you can guarantee?