From 90d3ef0637c66045eeab78ccf04e9ff51b9b451a Mon Sep 17 00:00:00 2001 From: xiongzhou4 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