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From: Alexander Monakov <amonakov@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org Subject: [gcc r13-3416] ipa-visibility: Optimize TLS access [PR99619] Date: Thu, 20 Oct 2022 17:52:46 +0000 (GMT) [thread overview] Message-ID: <20221020175246.58BB1384D154@sourceware.org> (raw) https://gcc.gnu.org/g:1d561e1851c466a4952081caef17747781609b00 commit r13-3416-g1d561e1851c466a4952081caef17747781609b00 Author: Artem Klimov <jakmobius@gmail.com> Date: Wed Jul 6 17:02:01 2022 +0300 ipa-visibility: Optimize TLS access [PR99619] Fix PR99619, which asks to optimize TLS model based on visibility. The fix is implemented as an IPA optimization: this allows to take optimized visibility status into account (as well as avoid modifying all language frontends). 2022-04-17 Artem Klimov <jakmobius@gmail.com> gcc/ChangeLog: PR middle-end/99619 * ipa-visibility.cc (function_and_variable_visibility): Promote TLS access model afer visibility optimizations. * varasm.cc (have_optimized_refs): New helper. (optimize_dyn_tls_for_decl_p): New helper. Use it ... (decl_default_tls_model): ... here in place of 'optimize' check. gcc/testsuite/ChangeLog: PR middle-end/99619 * gcc.dg/tls/vis-attr-gd.c: New test. * gcc.dg/tls/vis-attr-hidden-gd.c: New test. * gcc.dg/tls/vis-attr-hidden.c: New test. * gcc.dg/tls/vis-flag-hidden-gd.c: New test. * gcc.dg/tls/vis-flag-hidden.c: New test. * gcc.dg/tls/vis-pragma-hidden-gd.c: New test. * gcc.dg/tls/vis-pragma-hidden.c: New test. Co-Authored-By: Alexander Monakov <amonakov@gcc.gnu.org> Signed-off-by: Artem Klimov <jakmobius@gmail.com> Diff: --- gcc/ipa-visibility.cc | 19 +++++++++++++++ gcc/testsuite/gcc.dg/tls/vis-attr-gd.c | 12 ++++++++++ gcc/testsuite/gcc.dg/tls/vis-attr-hidden-gd.c | 13 ++++++++++ gcc/testsuite/gcc.dg/tls/vis-attr-hidden.c | 12 ++++++++++ gcc/testsuite/gcc.dg/tls/vis-flag-hidden-gd.c | 13 ++++++++++ gcc/testsuite/gcc.dg/tls/vis-flag-hidden.c | 12 ++++++++++ gcc/testsuite/gcc.dg/tls/vis-pragma-hidden-gd.c | 17 +++++++++++++ gcc/testsuite/gcc.dg/tls/vis-pragma-hidden.c | 16 +++++++++++++ gcc/varasm.cc | 32 ++++++++++++++++++++++++- 9 files changed, 145 insertions(+), 1 deletion(-) diff --git a/gcc/ipa-visibility.cc b/gcc/ipa-visibility.cc index 8a27e7bcdfd..3ed2b7cf679 100644 --- a/gcc/ipa-visibility.cc +++ b/gcc/ipa-visibility.cc @@ -873,6 +873,25 @@ function_and_variable_visibility (bool whole_program) } } + if (symtab->state >= IPA_SSA) + { + FOR_EACH_VARIABLE (vnode) + { + tree decl = vnode->decl; + + /* Upgrade TLS access model based on optimized visibility status, + unless it was specified explicitly or no references remain. */ + if (DECL_THREAD_LOCAL_P (decl) + && !lookup_attribute ("tls_model", DECL_ATTRIBUTES (decl)) + && vnode->ref_list.referring.length ()) + { + enum tls_model new_model = decl_default_tls_model (decl); + gcc_checking_assert (new_model >= decl_tls_model (decl)); + set_decl_tls_model (decl, new_model); + } + } + } + if (dump_file) { fprintf (dump_file, "\nMarking local functions:"); diff --git a/gcc/testsuite/gcc.dg/tls/vis-attr-gd.c b/gcc/testsuite/gcc.dg/tls/vis-attr-gd.c new file mode 100644 index 00000000000..89a248a8028 --- /dev/null +++ b/gcc/testsuite/gcc.dg/tls/vis-attr-gd.c @@ -0,0 +1,12 @@ +/* { dg-do compile } */ +/* { dg-require-effective-target fpic } */ +/* { dg-require-effective-target tls } */ +/* { dg-options "-O2 -fPIC -fdump-ipa-whole-program" } */ + +// tls_model should be global-dynamic due to explicitly specified attribute +__attribute__((tls_model("global-dynamic"))) +__thread int x; + +void reference() { x++; } + +/* { dg-final { scan-ipa-dump "Varpool flags: tls-global-dynamic" "whole-program" } } */ diff --git a/gcc/testsuite/gcc.dg/tls/vis-attr-hidden-gd.c b/gcc/testsuite/gcc.dg/tls/vis-attr-hidden-gd.c new file mode 100644 index 00000000000..e32565588c8 --- /dev/null +++ b/gcc/testsuite/gcc.dg/tls/vis-attr-hidden-gd.c @@ -0,0 +1,13 @@ +/* { dg-do compile } */ +/* { dg-require-effective-target fpic } */ +/* { dg-require-effective-target tls } */ +/* { dg-options "-O2 -fPIC -fdump-ipa-whole-program" } */ + +// tls_model should be global-dynamic due to explicitly specified attribute +__attribute__((visibility("hidden"))) +__attribute__((tls_model("global-dynamic"))) +__thread int x; + +void reference() { x++; } + +/* { dg-final { scan-ipa-dump "Varpool flags: tls-global-dynamic" "whole-program" } } */ diff --git a/gcc/testsuite/gcc.dg/tls/vis-attr-hidden.c b/gcc/testsuite/gcc.dg/tls/vis-attr-hidden.c new file mode 100644 index 00000000000..0d43fc565b0 --- /dev/null +++ b/gcc/testsuite/gcc.dg/tls/vis-attr-hidden.c @@ -0,0 +1,12 @@ +/* { dg-do compile } */ +/* { dg-require-effective-target fpic } */ +/* { dg-require-effective-target tls } */ +/* { dg-options "-O2 -fPIC -fdump-ipa-whole-program" } */ + +//tls_model should be local-dynamic due to visibility("hidden") +__attribute__((visibility("hidden"))) +__thread int x; + +void reference() { x++; } + +/* { dg-final { scan-ipa-dump "Varpool flags: tls-local-dynamic" "whole-program" } } */ diff --git a/gcc/testsuite/gcc.dg/tls/vis-flag-hidden-gd.c b/gcc/testsuite/gcc.dg/tls/vis-flag-hidden-gd.c new file mode 100644 index 00000000000..cad41e0c8e6 --- /dev/null +++ b/gcc/testsuite/gcc.dg/tls/vis-flag-hidden-gd.c @@ -0,0 +1,13 @@ +/* { dg-do compile } */ +/* { dg-require-effective-target fpic } */ +/* { dg-require-effective-target tls } */ +/* { dg-options "-O2 -fPIC -fdump-ipa-whole-program -fvisibility=hidden" } */ + + +// tls_model should be global-dynamic due to explicitly specified attribute +__attribute__((tls_model("global-dynamic"))) +__thread int x; + +void reference() { x++; } + +/* { dg-final { scan-ipa-dump "Varpool flags: tls-global-dynamic" "whole-program" } } */ diff --git a/gcc/testsuite/gcc.dg/tls/vis-flag-hidden.c b/gcc/testsuite/gcc.dg/tls/vis-flag-hidden.c new file mode 100644 index 00000000000..a15df092d4d --- /dev/null +++ b/gcc/testsuite/gcc.dg/tls/vis-flag-hidden.c @@ -0,0 +1,12 @@ +/* { dg-do compile } */ +/* { dg-require-effective-target fpic } */ +/* { dg-require-effective-target tls } */ +/* { dg-options "-O2 -fPIC -fdump-ipa-whole-program -fvisibility=hidden" } */ + + +// tls_model should be local-dynamic due to -fvisibility=hidden +__thread int x; + +void reference() { x++; } + +/* { dg-final { scan-ipa-dump "Varpool flags: tls-local-dynamic" "whole-program" } } */ diff --git a/gcc/testsuite/gcc.dg/tls/vis-pragma-hidden-gd.c b/gcc/testsuite/gcc.dg/tls/vis-pragma-hidden-gd.c new file mode 100644 index 00000000000..3b3598134fe --- /dev/null +++ b/gcc/testsuite/gcc.dg/tls/vis-pragma-hidden-gd.c @@ -0,0 +1,17 @@ +/* { dg-do compile } */ +/* { dg-require-effective-target fpic } */ +/* { dg-require-effective-target tls } */ +/* { dg-options "-O2 -fPIC -fdump-ipa-whole-program" } */ + + +#pragma GCC visibility push(hidden) + +// tls_model should be global-dynamic due to explicitly specified attribute +__attribute__((tls_model("global-dynamic"))) +__thread int x; + +#pragma GCC visibility pop + +void reference() { x++; } + +/* { dg-final { scan-ipa-dump "Varpool flags: tls-global-dynamic" "whole-program" } } */ diff --git a/gcc/testsuite/gcc.dg/tls/vis-pragma-hidden.c b/gcc/testsuite/gcc.dg/tls/vis-pragma-hidden.c new file mode 100644 index 00000000000..1be97644243 --- /dev/null +++ b/gcc/testsuite/gcc.dg/tls/vis-pragma-hidden.c @@ -0,0 +1,16 @@ +/* { dg-do compile } */ +/* { dg-require-effective-target fpic } */ +/* { dg-require-effective-target tls } */ +/* { dg-options "-O2 -fPIC -fdump-ipa-whole-program" } */ + + +#pragma GCC visibility push(hidden) + +// tls_model should be local-dynamic due to a pragma +__thread int x; + +#pragma GCC visibility pop + +void reference() { x++; } + +/* { dg-final { scan-ipa-dump "Varpool flags: tls-local-dynamic" "whole-program" } } */ diff --git a/gcc/varasm.cc b/gcc/varasm.cc index a11184584a2..d0beac8f8e3 100644 --- a/gcc/varasm.cc +++ b/gcc/varasm.cc @@ -6658,6 +6658,36 @@ init_varasm_once (void) #endif } +/* Determine whether SYMBOL is used in any optimized function. */ + +static bool +have_optimized_refs (struct symtab_node *symbol) +{ + struct ipa_ref *ref; + + for (int i = 0; symbol->iterate_referring (i, ref); i++) + { + cgraph_node *cnode = dyn_cast <cgraph_node *> (ref->referring); + + if (cnode && opt_for_fn (cnode->decl, optimize)) + return true; + } + + return false; +} + +/* Check if promoting general-dynamic TLS access model to local-dynamic is + desirable for DECL. */ + +static bool +optimize_dyn_tls_for_decl_p (const_tree decl) +{ + if (cfun) + return optimize; + return symtab->state >= IPA && have_optimized_refs (symtab_node::get (decl)); +} + + enum tls_model decl_default_tls_model (const_tree decl) { @@ -6675,7 +6705,7 @@ decl_default_tls_model (const_tree decl) /* Local dynamic is inefficient when we're not combining the parts of the address. */ - else if (optimize && is_local) + else if (is_local && optimize_dyn_tls_for_decl_p (decl)) kind = TLS_MODEL_LOCAL_DYNAMIC; else kind = TLS_MODEL_GLOBAL_DYNAMIC;
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