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| Clang options | |
| my cpu: https://ark.intel.com/content/www/us/en/ark/products/84985/intel-core-i5-5257u-processor-3m-cache-up-to-3-10-ghz.html | |
| (also try O2) | |
| -O3 enable best optimizations | |
| -march=native compile for arch, not isa | |
| -mtune=broadwell not sure if same in clang as gcc (https://lemire.me/blog/2018/07/25/it-is-more-complicated-than-i-thought-mtune-march-in-gcc/) | |
| -pipe use pipes between commands, when possible | |
| -funroll-loops unroll loops | |
| -fomit-frame-pointer save a register & instruction, in applicable (small) functions | |
| -flto ensure full-mode link-time optimization enabled | |
| bash configure --with-jvm-variants=custom --with-jvm-features=jni-check,serialgc,compiler1,compiler2,g1gc,cds,parallelgc --with-extra-cflags='-O3 -march=native -mtune=broadwell -pipe -funroll-loops -fomit-frame-pointer -flto' --with-extra-cxxflags='-O3 -march=native -mtune=broadwell -pipe -funroll-loops -fomit-frame-pointer -flto' |
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