combine/dce patch for PR36003, PR42575
Paolo Bonzini
bonzini@gnu.org
Wed Jun 23 12:33:00 GMT 2010
On 06/23/2010 12:41 PM, Eric Botcazou wrote:
> Reenabling pass_fast_rtl_byte_dce cannot be done without first evaluating the
> speed/performance trade-off, DF is known to be costly.
It's not these parts that are _extremely_ costly (it's only what is
inherently quadratic, and cannot be helped without rewriting the
algorithms to avoid that complexity). But I agree that it should only
be enabled at -O3.
Paolo
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