On Wed, Jun 18, 2014 at 11:56:01AM +0200, Richard Biener wrote:
>
> I just figured that we create &TARGET_MEM_REF [base: a_4, offset: 0]
> from within IVOPTs. That pessimizes further passes unnecessarily.
>
> Bootstrap and regtest running on x86_64-unknown-linux-gnu.
Isn't that against the comment above it?
??? As IVOPTs does not follow restrictions to where the base
pointer may point to create a MEM_REF only if we know that
base is valid.
Perhaps it is fine only if addr->offset is integer_zerop?
> 2014-06-18 Richard Biener <[email protected]>
>
> * tree-ssa-address.c (create_mem_ref_raw): Use proper predicate
> to catch all valid MEM_REF pointer operands.
>
> Index: gcc/tree-ssa-address.c
> ===================================================================
> --- gcc/tree-ssa-address.c (revision 211771)
> +++ gcc/tree-ssa-address.c (working copy)
> @@ -393,7 +393,7 @@ create_mem_ref_raw (tree type, tree alia
> ??? As IVOPTs does not follow restrictions to where the base
> pointer may point to create a MEM_REF only if we know that
> base is valid. */
> - if ((TREE_CODE (base) == ADDR_EXPR || TREE_CODE (base) == INTEGER_CST)
> + if (is_gimple_mem_ref_addr (base)
> && (!index2 || integer_zerop (index2))
> && (!addr->index || integer_zerop (addr->index)))
> return fold_build2 (MEM_REF, type, base, addr->offset);
Jakub
