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Re: [tree-ssa] more aggressive address folding
- From: "Joseph S. Myers" <jsm at polyomino dot org dot uk>
- To: Richard Henderson <rth at twiddle dot net>
- Cc: gcc-patches at gcc dot gnu dot org
- Date: Wed, 19 Nov 2003 18:43:42 +0000 (UTC)
- Subject: Re: [tree-ssa] more aggressive address folding
- References: <20031119160604.GA18500@twiddle.net>
On Wed, 19 Nov 2003, Richard Henderson wrote:
> I don't buy it, myself. If offsetof is the only reason, then we
> should add code to fold() to handle ADDR_EXPR of COMPONENT_REF and
> ARRAY_REF with an INTEGER_CST base pointer.
We should add __builtin_offsetof to the grammar (for both C and C++) to do
this properly. offsetof must return an integer constant expression, but
the traditional offsetof expansion mustn't.
--
Joseph S. Myers
jsm@polyomino.org.uk