[PATCH 4 of 4] Add hierarchical discriminator for loop unrolling

Fri, 09 Jan 2026 22:34:14 -0800 

I would like to again ping the patch posted in 
https://gcc.gnu.org/pipermail/gcc-patches/2025-November/700704.html

Add hierarchical discriminator support for loop unrolling.
Assigns multiplicity and copyid discriminators to distinguish unrolled
iterations.

gcc/ChangeLog:

        * cfgloopmanip.cc (duplicate_loop_body_to_header_edge): Assign
        hierarchical discriminators for loop unrolling.
        * cfgloopmanip.h (DLTHE_RECORD_HIERARCHICAL_DISCRIMINATOR): New flag.
        * tree-ssa-loop-ivcanon.cc (try_unroll_loop_completely): Pass flag
        to enable hierarchical discriminator assignment.
        (try_peel_loop): Likewise.

gcc/testsuite/ChangeLog:

        * gcc.dg/hierarchical-discriminator-unroll.c: New test.



Bootstrapped and regression tested on aarch64-linux-gnu with no new 
regressions. Is this OK?

Thanks,
Kugan

Attachment: 0004-Autofdo-V4-Add-hierarchical-discriminator-for-loop-u.patch
Description: 0004-Autofdo-V4-Add-hierarchical-discriminator-for-loop-u.patch

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