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Summary: The default threshold for fully unroll is too conservative. This patch doubles the full-unroll threshold This change will affect the following speccpu2006 benchmarks (performance numbers were collected from Intel Sandybridge): Performance: 403 0.11% 433 0.51% 445 0.48% 447 3.50% 453 1.49% 464 0.75% Code size: 403 0.56% 433 0.96% 445 2.16% 447 2.96% 453 0.94% 464 8.02% The compiler time overhead is similar with code size. Reviewers: davidxl, mkuper, mzolotukhin, hfinkel, chandlerc Reviewed By: hfinkel, chandlerc Subscribers: mehdi_amini, zzheng, efriedma, haicheng, hfinkel, llvm-commits Differential Revision: https://reviews.llvm.org/D28368 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@295538 91177308-0d34-0410-b5e6-96231b3b80d8
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