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{
  "commit": "5c23bb074af23f00dd3fe1745b9dd99245fa4bba",
  "tree": "678fc153d591900547507109ccc3af450c1d0028",
  "parents": [
    "e754b70fe5470b975d31887fa5647f1c92d6522d"
  ],
  "author": {
    "name": "Kyrylo Tkachov",
    "email": "ktkachov@nvidia.com",
    "time": "Tue Jun 30 14:04:02 2026 +0200"
  },
  "committer": {
    "name": "Kyrylo Tkachov",
    "email": "ktkachov@nvidia.com",
    "time": "Mon Jul 06 10:23:56 2026 +0200"
  },
  "message": "Remove the path-splitting pass and deprecate -fsplit-paths [PR120892]\n\npass_split_paths duplicates the join block of an IF-THEN-ELSE that feeds a\nloop latch, splitting the two paths to the backedge.  It runs only at -O3.\nIn practice it interacts badly with later optimizations: it duplicates the\nloop body before loads have been commoned and before if-conversion runs, so\nit can block both loop unrolling (PR120892) and if-conversion of the\nduplicated diamond, while its own heuristic already declines about half of\nall candidate blocks, most often to avoid spoiling if-conversion.\n\nRemove the pass and deprecate the -fsplit-paths option.  The option is kept\naccepted for backward compatibility via the Ignore flag and now does nothing,\nmatching how other optimization options have been retired (for example\n-ftree-lrs).  param_max_jump_thread_duplication_stmts is retained as it is\nshared with the jump-threading passes.\n\nStatistics from the pass on SPEC CPU 2026 (intrate + fprate, counted from the\nsplit-paths dump):\n\n                    candidates   splits   declined   to protect if-conversion\n  -O3                  122894    62050     60844           37166\n  -O3 -flto\u003dauto        52423    21257     31166           21822\n\nThe pass splits about half of the blocks it considers and declines the rest,\nmost often to avoid spoiling if-conversion.  The duplication grows .text by\n0.32% at -O3 and 0.24% at -O3 -flto\u003dauto.\n\nAndrea and Jeff indicated in PR120892 that removing -fsplit-paths may be\nthe way to go there.\n\n-fsplit-paths also complicates the control-flow and defeats the\nload-commoning necessary to get good if-conversion of the hot loop from\nSnappy from https://gcc.gnu.org/bugzilla/show_bug.cgi?id\u003d125557#c13 .\n\nBootstrapped and tested on aarch64-none-linux-gnu and x86_64-linux.\n\ngcc/ChangeLog:\n\n\tPR tree-optimization/120892\n\t* gimple-ssa-split-paths.cc: Remove.\n\t* passes.def (pass_split_paths): Remove.\n\t* tree-pass.h (make_pass_split_paths): Remove.\n\t* Makefile.in (OBJS): Remove gimple-ssa-split-paths.o.\n\t* timevar.def (TV_SPLIT_PATHS): Remove.\n\t* opts.cc (default_options_table): Remove the OPT_LEVELS_3_PLUS entry\n\tfor OPT_fsplit_paths.\n\t* common.opt (fsplit-paths): Make it a deprecated no-op using Ignore.\n\t* doc/invoke.texi (-fsplit-paths): Document as deprecated and remove it\n\tfrom the option summary and the -O3 list.\n\ngcc/testsuite/ChangeLog:\n\n\tPR tree-optimization/120892\n\t* gcc.dg/tree-ssa/split-path-1.c: Move to...\n\t* gcc.c-torture/execute/split-path-1.c: ...here.  Adjust to a plain\n\tcompile and run test without the split-paths dump scan.\n\t* gcc.dg/tree-ssa/split-path-2.c: Move to...\n\t* gcc.c-torture/compile/split-path-2.c: ...here.  Adjust to a\n\tcompile-only test without the split-paths dump scan.\n\t* gcc.dg/tree-ssa/split-path-3.c: Move to...\n\t* gcc.c-torture/compile/split-path-3.c: ...here.  Likewise.\n\t* gcc.dg/tree-ssa/split-path-4.c: Move to...\n\t* gcc.c-torture/compile/split-path-4.c: ...here.  Likewise.\n\t* gcc.dg/tree-ssa/split-path-5.c: Move to...\n\t* gcc.c-torture/compile/split-path-5.c: ...here.  Likewise.\n\t* gcc.dg/tree-ssa/split-path-6.c: Move to...\n\t* gcc.c-torture/compile/split-path-6.c: ...here.  Likewise.\n\t* gcc.dg/tree-ssa/split-path-7.c: Move to...\n\t* gcc.c-torture/compile/split-path-7.c: ...here.  Likewise.\n\t* gcc.dg/tree-ssa/split-path-8.c: Move to...\n\t* gcc.c-torture/compile/split-path-8.c: ...here.  Likewise.\n\t* gcc.dg/tree-ssa/split-path-9.c: Move to...\n\t* gcc.c-torture/compile/split-path-9.c: ...here.  Likewise.\n\t* gcc.dg/tree-ssa/split-path-10.c: Move to...\n\t* gcc.c-torture/compile/split-path-10.c: ...here.  Likewise.\n\t* gcc.dg/tree-ssa/split-path-11.c: Move to...\n\t* gcc.c-torture/compile/split-path-11.c: ...here.  Likewise.\n\t* gcc.dg/tree-ssa/split-path-12.c: Move to...\n\t* gcc.c-torture/compile/split-path-12.c: ...here.  Likewise.\n\t* gcc.dg/tree-ssa/split-path-13.c: Move to...\n\t* gcc.c-torture/compile/split-path-13.c: ...here.  Likewise.\n\t* gcc.dg/tree-ssa/pr69270.c: Move to...\n\t* gcc.c-torture/compile/pr69270.c: ...here.  Likewise.\n\t* g++.dg/tree-ssa/pr88797.C: Move to...\n\t* g++.dg/torture/pr88797.C: ...here.  Adjust to a compile-only test.\n\t* gcc.target/i386/pr106450.c: Remove -fsplit-paths from dg-options.\n\nSigned-off-by: Kyrylo Tkachov \u003cktkachov@nvidia.com\u003e\n",
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