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exec: Cache TARGET_PAGE_MASK for TARGET_PAGE_BITS_VARY
This eliminates a set of runtime shifts. It turns out that we require TARGET_PAGE_MASK more often than TARGET_PAGE_SIZE, so redefine TARGET_PAGE_SIZE based on TARGET_PAGE_MASK instead of the other way around. Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: David Hildenbrand <david@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
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