tree 52efc2eeb7b017d600c69dcf574ab84148d1c895
parent 1bb9f1a00f22d2a4599408c8f9f5201eb0acce04
author Matt Morehouse <mascasa@google.com> 1596049094 +0000
committer Copybara-Service <copybara-worker@google.com> 1616739673 -0700

[DFSan] Add efficient fast16labels instrumentation mode.

Adds the -fast-16-labels flag, which enables efficient instrumentation
for DFSan when the user needs <=16 labels.  The instrumentation
eliminates most branches and most calls to __dfsan_union or
__dfsan_union_load.

Reviewed By: vitalybuka

Differential Revision: https://reviews.llvm.org/D84371

GitOrigin-RevId: e2d0b44a7cd261218c9e527d23eb5d13425afe8b