LLD: Move RoundTrip tests behind a flag
shankare at codeaurora.org
Wed Mar 19 15:56:35 PDT 2014
On 3/19/2014 5:38 PM, Rui Ueyama wrote:
> It is proved that RoundTripNative and RoundTripYAML are good harnesses
> to guarantee there's no information loss when an object is converted
> to/from native/YAML formats. However, it makes LLD *extremely* slow
> when linking non-toy programs.
> If RoundTrip tests are enabled, LLD takes about 10 *minutes* to link
> itself on my Linux box. My machine is 3.5GHz Xeon. The result of gprof
> on LLD linking llvm-tblegen shows that 77.8% of time was consumed by
> RoundTripYAMLPass::perform() and 16.6% by
> RoundTripNativePass::perform(). It means RoundTrip tests are the
> dominant factor.
> I couldn't even run LLD linking LLD with profiling enabled because it
> was too slow that I couldn't wait it to finish.
> This is not an acceptable performance penalty even for debug build. I
> think we should move the feature behind a flag and enable it only for
> Any objections?
We could use non debug builds isn't it ? Will this not solve the issue ?
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