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From 90d3ef0637c66045eeab78ccf04e9ff51b9b451a Mon Sep 17 00:00:00 2001
From: xiongzhou4 <xiongzhou4@huawei.com>
Date: Thu, 1 Jun 2023 09:28:27 +0800
Subject: [PATCH 5/5] [PGO kernel] Add fkernel-pgo option to support PGO kernel
compilation.
If specified, disable TLS setting of instrumentation variables in
gcc/tree-profile.c, as kernel does not support TLS.
---
gcc/common.opt | 4 ++++
gcc/tree-profile.c | 4 +++-
2 files changed, 7 insertions(+), 1 deletion(-)
diff --git a/gcc/common.opt b/gcc/common.opt
index 238c97db8..6f0ed7cea 100644
--- a/gcc/common.opt
+++ b/gcc/common.opt
@@ -2302,6 +2302,10 @@ fprofile-generate=
Common Joined RejectNegative
Enable common options for generating profile info for profile feedback directed optimizations, and set -fprofile-dir=.
+fkernel-pgo
+Common Report Var(flag_kernel_pgo) Optimization Init(0)
+Disable TLS setting of instrumentation variables to support PGO kernel compilation in -fprofile-generate, as kernel does not support TLS.
+
fprofile-partial-training
Common Report Var(flag_profile_partial_training) Optimization
Do not assume that functions never executed during the train run are cold.
diff --git a/gcc/tree-profile.c b/gcc/tree-profile.c
index 6c0838261..924817472 100644
--- a/gcc/tree-profile.c
+++ b/gcc/tree-profile.c
@@ -105,7 +105,9 @@ init_ic_make_global_vars (void)
DECL_ARTIFICIAL (ic_tuple_var) = 1;
DECL_INITIAL (ic_tuple_var) = NULL;
DECL_EXTERNAL (ic_tuple_var) = 1;
- if (targetm.have_tls)
+ /* Disable TLS setting when compiling kernel in -fprofile-generate,
+ as kernel does not support TLS. */
+ if (targetm.have_tls && !flag_kernel_pgo)
set_decl_tls_model (ic_tuple_var, decl_default_tls_model (ic_tuple_var));
}
--
2.33.0
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