diff options
Diffstat (limited to 'gcc/doc/tm.texi')
| -rw-r--r-- | gcc/doc/tm.texi | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/gcc/doc/tm.texi b/gcc/doc/tm.texi index 4de6e2d..7d65954 100644 --- a/gcc/doc/tm.texi +++ b/gcc/doc/tm.texi @@ -6667,13 +6667,15 @@ a pattern for a branchy check corresponding to a simple check denoted by @var{insn} should be generated. In this case @var{label} can't be null. @end deftypefn -@deftypefn {Target Hook} int TARGET_SCHED_FIRST_CYCLE_MULTIPASS_DFA_LOOKAHEAD_GUARD_SPEC (rtx @var{insn}) +@deftypefn {Target Hook} bool TARGET_SCHED_FIRST_CYCLE_MULTIPASS_DFA_LOOKAHEAD_GUARD_SPEC (const_rtx @var{insn}) This hook is used as a workaround for @samp{TARGET_SCHED_FIRST_CYCLE_MULTIPASS_DFA_LOOKAHEAD_GUARD} not being called on the first instruction of the ready list. The hook is used to -discard speculative instruction that stand first in the ready list from -being scheduled on the current cycle. For non-speculative instructions, -the hook should always return nonzero. For example, in the ia64 backend +discard speculative instructions that stand first in the ready list from +being scheduled on the current cycle. If the hook returns @code{false}, +@var{insn} will not be chosen to be issued. +For non-speculative instructions, +the hook should always return @code{true}. For example, in the ia64 backend the hook is used to cancel data speculative insns when the ALAT table is nearly full. @end deftypefn |