mirror of git://gcc.gnu.org/git/gcc.git
f708b83d19
This patch adds runtime thread count detection to auto-parallelization. -ftree-parallelize-loops option generates parallelized loops without specifying a fixed thread count, deferring this decision to program execution time where it is controlled by the OMP_NUM_THREADS environment variable. Bootstrap and regression tested on aarch64-linux. Compiled SPEC HPC pot3d https://www.spec.org/hpc2021/docs/benchmarks/628.pot3d_s.html with -ftree-parallelize-loops and tested without having OMP_NUM_THREADS set in the environment and with OMP_NUM_THREADS set to different values. gcc/ChangeLog: * doc/invoke.texi (ftree-parallelize-loops): Update. * common.opt (ftree-parallelize-loops): Add alias that maps to special value INT_MAX for runtime thread detection. * tree-parloops.cc (create_parallel_loop): Use INT_MAX for runtime detection. Call gimple_build_omp_parallel without building a OMP_CLAUSE_NUM_THREADS clause. (gen_parallel_loop): For auto-detection, use a conservative estimate of 2 threads. (parallelize_loops): Same. gcc/testsuite/ChangeLog: * gcc.dg/autopar/runtime-auto.c: New test. Signed-off-by: Sebastian Pop <spop@nvidia.com> |
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| ChangeLog | ||
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README
This directory contains the GNU Compiler Collection (GCC). The GNU Compiler Collection is free software. See the files whose names start with COPYING for copying permission. The manuals, and some of the runtime libraries, are under different terms; see the individual source files for details. The directory INSTALL contains copies of the installation information as HTML and plain text. The source of this information is gcc/doc/install.texi. The installation information includes details of what is included in the GCC sources and what files GCC installs. See the file gcc/doc/gcc.texi (together with other files that it includes) for usage and porting information. An online readable version of the manual is in the files gcc/doc/gcc.info*. See http://gcc.gnu.org/bugs/ for how to report bugs usefully. Copyright years on GCC source files may be listed using range notation, e.g., 1987-2012, indicating that every year in the range, inclusive, is a copyrightable year that could otherwise be listed individually.