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Another remaining case is that we end up comparing calls with mismatching number of parameters or with different permutations of them. This is because we hash decls to nothing. This patch improves that by hashing decls by their code and parm decls by indexes that are stable. Also for defualt defs in SSA_NAMEs we can add the corresponding decl (that is usually parm decls). Still we could improve on this by hasing ssa names by their definit parameters and possibly making maps of other decls and assigning them stable function local IDs. * ipa-icf-gimple.c (func_checker::hash_operand): Improve hashing of decls.
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