diff options
Diffstat (limited to 'clang/lib/Driver')
| -rw-r--r-- | clang/lib/Driver/Tools.cpp | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp index c30c45d26bd..89df632d5c0 100644 --- a/clang/lib/Driver/Tools.cpp +++ b/clang/lib/Driver/Tools.cpp @@ -3382,9 +3382,19 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA, OptSpecifier VectorizeAliasOption = EnableVec ? options::OPT_O_Group : options::OPT_fvectorize; if (Args.hasFlag(options::OPT_fvectorize, VectorizeAliasOption, - options::OPT_fno_vectorize, EnableVec)) + options::OPT_fno_vectorize, EnableVec)) { CmdArgs.push_back("-vectorize-loops"); + // In addition to the regular loop unrolling transformation, the loop + // vectorizer can also unroll loops. If no unrolling has specifically been + // requested, then also prevent the loop vectorizer from unrolling loops. + if (Args.hasFlag(options::OPT_fno_unroll_loops, + options::OPT_funroll_loops, false)) { + CmdArgs.push_back("-backend-option"); + CmdArgs.push_back("-force-vector-unroll=1"); + } + } + // -fslp-vectorize is default. if (Args.hasFlag(options::OPT_fslp_vectorize, options::OPT_fno_slp_vectorize, true)) |
