On Fri, 27 Jul 2018, Richard Earnshaw wrote: > > This patch defines a new intrinsic function > __builtin_speculation_safe_value. A generic default implementation is > defined which will attempt to use the backend pattern > "speculation_safe_barrier". If this pattern is not defined, or if it > is not available, then the compiler will emit a warning, but > compilation will continue. > > Note that the test spec-barrier-1.c will currently fail on all > targets. This is deliberate, the failure will go away when > appropriate action is taken for each target backend.
OK. Thanks, Richard. > gcc: > * builtin-types.def (BT_FN_PTR_PTR_VAR): New function type. > (BT_FN_I1_I1_VAR, BT_FN_I2_I2_VAR, BT_FN_I4_I4_VAR): Likewise. > (BT_FN_I8_I8_VAR, BT_FN_I16_I16_VAR): Likewise. > * builtin-attrs.def (ATTR_NOVOPS_NOTHROW_LEAF_LIST): New attribute > list. > * builtins.def (BUILT_IN_SPECULATION_SAFE_VALUE_N): New builtin. > (BUILT_IN_SPECULATION_SAFE_VALUE_PTR): New internal builtin. > (BUILT_IN_SPECULATION_SAFE_VALUE_1): Likewise. > (BUILT_IN_SPECULATION_SAFE_VALUE_2): Likewise. > (BUILT_IN_SPECULATION_SAFE_VALUE_4): Likewise. > (BUILT_IN_SPECULATION_SAFE_VALUE_8): Likewise. > (BUILT_IN_SPECULATION_SAFE_VALUE_16): Likewise. > * builtins.c (expand_speculation_safe_value): New function. > (expand_builtin): Call it. > * doc/cpp.texi: Document predefine __HAVE_SPECULATION_SAFE_VALUE. > * doc/extend.texi: Document __builtin_speculation_safe_value. > * doc/md.texi: Document "speculation_barrier" pattern. > * doc/tm.texi.in: Pull in TARGET_SPECULATION_SAFE_VALUE and > TARGET_HAVE_SPECULATION_SAFE_VALUE. > * doc/tm.texi: Regenerated. > * target.def (have_speculation_safe_value, speculation_safe_value): New > hooks. > * targhooks.c (default_have_speculation_safe_value): New function. > (default_speculation_safe_value): New function. > * targhooks.h (default_have_speculation_safe_value): Add prototype. > (default_speculation_safe_value): Add prototype. > > c-family: > * c-common.c (speculation_safe_resolve_call): New function. > (speculation_safe_resolve_params): New function. > (speculation_safe_resolve_return): New function. > (resolve_overloaded_builtin): Handle __builtin_speculation_safe_value. > * c-cppbuiltin.c (c_cpp_builtins): Add pre-define for > __HAVE_SPECULATION_SAFE_VALUE. > > testsuite: > * c-c++-common/spec-barrier-1.c: New test. > * c-c++-common/spec-barrier-2.c: New test. > * gcc.dg/spec-barrier-3.c: New test. > --- > gcc/builtin-attrs.def | 2 + > gcc/builtin-types.def | 6 + > gcc/builtins.c | 60 ++++++++++ > gcc/builtins.def | 22 ++++ > gcc/c-family/c-common.c | 164 > ++++++++++++++++++++++++++++ > gcc/c-family/c-cppbuiltin.c | 7 +- > gcc/doc/cpp.texi | 4 + > gcc/doc/extend.texi | 91 +++++++++++++++ > gcc/doc/md.texi | 15 +++ > gcc/doc/tm.texi | 31 ++++++ > gcc/doc/tm.texi.in | 4 + > gcc/target.def | 35 ++++++ > gcc/targhooks.c | 32 ++++++ > gcc/targhooks.h | 3 + > gcc/testsuite/c-c++-common/spec-barrier-1.c | 38 +++++++ > gcc/testsuite/c-c++-common/spec-barrier-2.c | 17 +++ > gcc/testsuite/gcc.dg/spec-barrier-3.c | 13 +++ > 17 files changed, 543 insertions(+), 1 deletion(-) > create mode 100644 gcc/testsuite/c-c++-common/spec-barrier-1.c > create mode 100644 gcc/testsuite/c-c++-common/spec-barrier-2.c > create mode 100644 gcc/testsuite/gcc.dg/spec-barrier-3.c > > -- Richard Biener <rguent...@suse.de> SUSE LINUX GmbH, GF: Felix Imendoerffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nuernberg)
