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| author | Rong Xu <xur@google.com> | 2021-05-18 16:08:38 -0700 |
|---|---|---|
| committer | Rong Xu <xur@google.com> | 2021-05-18 16:23:43 -0700 |
| commit | 886629a8c9e58752627d8ae7abf6fa93191a3df8 (patch) | |
| tree | 7088ed315c5e8e85dee413f325174183bf6fe2cd /llvm/lib/CodeGen/MachineBasicBlock.cpp | |
| parent | ff99fdf63f9939d5205c0c0df85f28c5509eac0f (diff) | |
| download | llvm-886629a8c9e58752627d8ae7abf6fa93191a3df8.zip llvm-886629a8c9e58752627d8ae7abf6fa93191a3df8.tar.gz llvm-886629a8c9e58752627d8ae7abf6fa93191a3df8.tar.bz2 | |
[SampleFDO] New hierarchical discriminator for Flow Sensitive SampleFDO
This patch implements first part of Flow Sensitive SampleFDO (FSAFDO).
It has the following changes:
(1) disable current discriminator encoding scheme,
(2) new hierarchical discriminator for FSAFDO.
For this patch, option "-enable-fs-discriminator=true" turns on the new
functionality. Option "-enable-fs-discriminator=false" (the default)
keeps the current SampleFDO behavior. When the fs-discriminator is
enabled, we insert a flag variable, namely, llvm_fs_discriminator, to
the object. This symbol will checked by create_llvm_prof tool, and used
to generate a profile with FS-AFDO discriminators enabled. If this
happens, for an extbinary format profile, create_llvm_prof tool
will add a flag to profile summary section.
Differential Revision: https://reviews.llvm.org/D102246
Diffstat (limited to 'llvm/lib/CodeGen/MachineBasicBlock.cpp')
0 files changed, 0 insertions, 0 deletions