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Inter-block localization is the same as what currently happens, except now it only runs on the entry block because that's where the problematic constants with long live ranges come from. The second phase is a new intra-block localization phase which attempts to re-sink the already localized instructions further right before one of the multiple uses. One additional change is to also localize G_GLOBAL_VALUE as they're constants too. However, on some targets like arm64 it takes multiple instructions to materialize the value, so some additional heuristics with a TTI hook have been introduced attempt to prevent code size regressions when localizing these. Overall, these changes improve CTMark code size on arm64 by 1.2%. Full code size results: Program baseline new diff ------------------------------------------------------------------------------ test-suite...-typeset/consumer-typeset.test 1249984 1217216 -2.6% test-suite...:: CTMark/ClamAV/clamscan.test 1264928 1232152 -2.6% test-suite :: CTMark/SPASS/SPASS.test 1394092 1361316 -2.4% test-suite...Mark/mafft/pairlocalalign.test 731320 714928 -2.2% test-suite :: CTMark/lencod/lencod.test 1340592 1324200 -1.2% test-suite :: CTMark/kimwitu++/kc.test 3853512 3820420 -0.9% test-suite :: CTMark/Bullet/bullet.test 3406036 3389652 -0.5% test-suite...ark/tramp3d-v4/tramp3d-v4.test 8017000 8016992 -0.0% test-suite...TMark/7zip/7zip-benchmark.test 2856588 2856588 0.0% test-suite...:: CTMark/sqlite3/sqlite3.test 765704 765704 0.0% Geomean difference -1.2% Differential Revision: https://reviews.llvm.org/D63303 llvm-svn: 363632
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