From fc2ec2dc8f67e1db55a2b4e809abfdbd0003fa7a Mon Sep 17 00:00:00 2001 From: Kugan Vivekanandarajah Date: Tue, 11 Nov 2025 18:17:21 -0800 Subject: [PATCH 3/4] [AutoFDO] Add hierarchical discriminator for loop versioning Add hierarchical discriminator support for loop versioning pass. Assigns copyid discriminators to distinguish different loop versions. gcc/ChangeLog: * gimple-loop-versioning.cc (loop_versioning::version_loop): Assign copyid discriminators to distinguish different loop versions. Signed-off-by: Kugan Vivekanandarajah --- gcc/gimple-loop-versioning.cc | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/gcc/gimple-loop-versioning.cc b/gcc/gimple-loop-versioning.cc index 5c9b2fb77ff..3264d0589eb 100644 --- a/gcc/gimple-loop-versioning.cc +++ b/gcc/gimple-loop-versioning.cc @@ -41,6 +41,7 @@ along with GCC; see the file COPYING3. If not see #include "tree-into-ssa.h" #include "gimple-range.h" #include "tree-cfg.h" +#include "hierarchical_discriminator.h" namespace { @@ -1699,6 +1700,13 @@ loop_versioning::version_loop (class loop *loop) return false; } + /* Assign hierarchical discriminators to distinguish loop versions. + This allows AutoFDO to distinguish profile data from different + versions. No multiplicity for non-vectorized loop versioning. */ + assign_discriminators_to_loop (li.optimized_loop, 0, + DISCRIMINATOR_LOOP_VERSION_ALIGNED); + assign_discriminators_to_loop (loop, 0, DISCRIMINATOR_LOOP_VERSION_UNALIGNED); + if (dump_enabled_p ()) dump_printf_loc (MSG_OPTIMIZED_LOCATIONS, find_loop_location (loop), "versioned this loop for when certain strides are 1\n"); -- 2.34.1