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author | Richard Earnshaw <rearnsha@arm.com> | 2018-07-31 17:36:36 +0000 |
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committer | Richard Earnshaw <rearnsha@gcc.gnu.org> | 2018-07-31 17:36:36 +0000 |
commit | f3debef33629f8e8a95b5ed0cb79296e7a0282df (patch) | |
tree | f5992c2819cabd23432a44ebf8afd245a075eed1 /gcc/target.def | |
parent | c0111dc43591647ef6d619a1fc222a8e9a06e058 (diff) |
targhooks - provide an alternative hook for targets that never execute speculatively
This hook adds an alternative implementation for the target hook
TARGET_HAVE_SPECULATION_SAFE_VALUE; it can be used by targets that have no
CPU implementations that execute code speculatively. All that is needed for
such targets now is to add:
#undef TARGET_HAVE_SPECULATION_SAFE_VALUE
#define TARGET_HAVE_SPECULATION_SAFE_VALUE speculation_safe_value_not_needed.
to where you have your other target hooks and you're done.
gcc:
* targhooks.h (speculation_safe_value_not_needed): New prototype.
* targhooks.c (speculation_safe_value_not_needed): New function.
* target.def (have_speculation_safe_value): Update documentation.
* doc/tm.texi: Regenerated.
From-SVN: r263175
Diffstat (limited to 'gcc/target.def')
-rw-r--r-- | gcc/target.def | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/gcc/target.def b/gcc/target.def index dc8d7deba2e..c570f3825a5 100644 --- a/gcc/target.def +++ b/gcc/target.def @@ -4166,7 +4166,12 @@ DEFHOOK The default implementation returns false if the target does not define\n\ a pattern named @code{speculation_barrier}. Else it returns true\n\ for the first case and whether the pattern is enabled for the current\n\ - compilation for the second case.", + compilation for the second case.\n\ + \n\ + For targets that have no processors that can execute instructions\n\ + speculatively an alternative implemenation of this hook is available:\n\ + simply redefine this hook to @code{speculation_safe_value_not_needed}\n\ + along with your other target hooks.", bool, (bool active), default_have_speculation_safe_value) DEFHOOK |