forked from OSchip/llvm-project
82ce334727
Currently an unknown/undef value is marked as overdefined when merged with an empty range. An empty range can occur in unreachable/dead code. When merging the new unknown state (= no value known yet) with an empty range, there still isn't any information about the value yet and we can stay in unknown. This gives a few nice improvements on the number of instructions removed by IPSCCP: Same hash: 170 (filtered out) Remaining: 67 Metric: sccp.IPNumInstRemoved Program base patch diff test-suite...rks/FreeBench/mason/mason.test 3.00 6.00 100.0% test-suite...nchmarks/McCat/18-imp/imp.test 3.00 5.00 66.7% test-suite...C/CFP2000/179.art/179.art.test 2.00 3.00 50.0% test-suite...ijndael/security-rijndael.test 2.00 3.00 50.0% test-suite...ks/Prolangs-C/agrep/agrep.test 40.00 58.00 45.0% test-suite...ce/Applications/Burg/burg.test 26.00 37.00 42.3% test-suite...cCat/03-testtrie/testtrie.test 3.00 4.00 33.3% test-suite...Source/Benchmarks/sim/sim.test 29.00 36.00 24.1% test-suite.../Applications/spiff/spiff.test 9.00 11.00 22.2% test-suite...s/FreeBench/neural/neural.test 5.00 6.00 20.0% test-suite...pplications/treecc/treecc.test 66.00 79.00 19.7% test-suite...langs-C/football/football.test 85.00 101.00 18.8% test-suite...ce/Benchmarks/PAQ8p/paq8p.test 90.00 105.00 16.7% test-suite...oxyApps-C++/miniFE/miniFE.test 37.00 43.00 16.2% test-suite...rks/FreeBench/pifft/pifft.test 26.00 30.00 15.4% test-suite...lications/sqlite3/sqlite3.test 481.00 548.00 13.9% test-suite...marks/7zip/7zip-benchmark.test 4875.00 5522.00 13.3% test-suite.../CINT2000/176.gcc/176.gcc.test 1117.00 1197.00 7.2% test-suite...0.perlbench/400.perlbench.test 1618.00 1732.00 7.0% Reviewers: efriedma, nikic, davide Reviewed By: efriedma Differential Revision: https://reviews.llvm.org/D78667 |
||
|---|---|---|
| .. | ||
| 2010-09-02-Trunc.ll | ||
| 2010-09-26-MergeConstantRange.ll | ||
| add.ll | ||
| alloca.ll | ||
| and.ll | ||
| ashr.ll | ||
| basic.ll | ||
| conflict.ll | ||
| crash.ll | ||
| deopt.ll | ||
| guards.ll | ||
| icmp.ll | ||
| merge-range-and-undef.ll | ||
| mul.ll | ||
| non-null.ll | ||
| overflow_predicate.ll | ||
| overflows.ll | ||
| phi-common-val.ll | ||
| pointer.ll | ||
| pr35807.ll | ||
| profmd.ll | ||
| range.ll | ||
| sdiv.ll | ||
| select.ll | ||
| sext.ll | ||
| shl.ll | ||
| srem.ll | ||
| sub.ll | ||
| udiv.ll | ||
| urem.ll | ||