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Re: [tree-ssa] Removing redundant loads


In message <wvln0h40yjy.fsf@prospero.boston.redhat.com>, Jason Merrill writes:
 >On Fri, 30 May 2003 16:54:47 -0600, law@redhat.com wrote:
 >
 >> ARggh.
 >>
 >> operand_equal_p returns false if either operand has side effects -- even
 >> if both operands are equal.
 >
 >Hmm.  This isn't a problem for gimple_tree_eq, since I don't want to share
 >a temp between evaluations of an expression with side effects.
Understood.

 >> 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
 >> set.
 >
 >Why does that expression have TREE_SIDE_EFFECTS set?
Unknown.

Jeff


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