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Diffstat (limited to 'gcc/doc/rtl.texi')
| -rw-r--r-- | gcc/doc/rtl.texi | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/gcc/doc/rtl.texi b/gcc/doc/rtl.texi index 533b0b9add5..c5e8d33c15b 100644 --- a/gcc/doc/rtl.texi +++ b/gcc/doc/rtl.texi @@ -3285,6 +3285,16 @@ This insn uses @var{op}, a @code{code_label} or a @code{note} of type be held in a register. The presence of this note allows jump optimization to be aware that @var{op} is, in fact, being used, and flow optimization to build an accurate flow graph. + +@findex REG_CROSSING_JUMP +@item REG_CROSSING_JUMP +This insn is an branching instruction (either an unconditional jump or +an indirect jump) which crosses between hot and cold sections, which +could potentially be very far apart in the executable. The presence +of this note indicates to other optimizations that this this branching +instruction should not be ``collapsed'' into a simpler branching +construct. It is used when the optimization to partition basic blocks +into hot and cold sections is turned on. @end table The following notes describe attributes of outputs of an insn: |