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Re: [tree-ssa] Removing redundant loads
- From: law at redhat dot com
- To: Jason Merrill <jason at redhat dot com>
- Cc: Diego Novillo <dnovillo at redhat dot com>, "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
- Date: Fri, 30 May 2003 18:34:45 -0600
- Subject: Re: [tree-ssa] Removing redundant loads
- Reply-to: law at redhat dot com
In message <firstname.lastname@example.org>, Jason Merrill writes:
>> For example, if you pass it this tree for both operands, you'll get a
>> false back from operand_b because this expression has tree_side_effects
>Why does that expression have TREE_SIDE_EFFECTS set?
Because we unconditionally set TREE_SIDE_EFFECTS on STMT_EXPRs. That
gets propagated up to the COMPONENT_REFs.
The testcase for the code in question looks something like:
struct tree_decl decl;
typedef union tree_node *tree;