p->must_stay = true;
}
+/* Encapsulate the block starting at FIRST and ending with LAST, which is
+ logically equivalent to EQUIV, so it gets manipulated as a unit if it
+ is possible to do so. */
+
+static void
+maybe_encapsulate_block (rtx first, rtx last, rtx equiv)
+{
+ if (!flag_non_call_exceptions || !may_trap_p (equiv))
+ {
+ /* We can't attach the REG_LIBCALL and REG_RETVAL notes when the
+ encapsulated region would not be in one basic block, i.e. when
+ there is a control_flow_insn_p insn between FIRST and LAST. */
+ bool attach_libcall_retval_notes = true;
+ rtx insn, next = NEXT_INSN (last);
+
+ for (insn = first; insn != next; insn = NEXT_INSN (insn))
+ if (control_flow_insn_p (insn))
+ {
+ attach_libcall_retval_notes = false;
+ break;
+ }
+
+ if (attach_libcall_retval_notes)
+ {
+ REG_NOTES (first) = gen_rtx_INSN_LIST (REG_LIBCALL, last,
+ REG_NOTES (first));
+ REG_NOTES (last) = gen_rtx_INSN_LIST (REG_RETVAL, first,
+ REG_NOTES (last));
+ }
+ }
+}
+
/* Emit code to perform a series of operations on a multi-word quantity, one
word at a time.
else
first = NEXT_INSN (prev);
- /* Encapsulate the block so it gets manipulated as a unit. */
- REG_NOTES (first) = gen_rtx_INSN_LIST (REG_LIBCALL, last,
- REG_NOTES (first));
- REG_NOTES (last) = gen_rtx_INSN_LIST (REG_RETVAL, first, REG_NOTES (last));
+ maybe_encapsulate_block (first, last, equiv);
return last;
}
else
first = NEXT_INSN (prev);
- /* Encapsulate the block so it gets manipulated as a unit. */
- if (!flag_non_call_exceptions || !may_trap_p (equiv))
- {
- /* We can't attach the REG_LIBCALL and REG_RETVAL notes
- when the encapsulated region would not be in one basic block,
- i.e. when there is a control_flow_insn_p insn between FIRST and LAST.
- */
- bool attach_libcall_retval_notes = true;
- next = NEXT_INSN (last);
- for (insn = first; insn != next; insn = NEXT_INSN (insn))
- if (control_flow_insn_p (insn))
- {
- attach_libcall_retval_notes = false;
- break;
- }
-
- if (attach_libcall_retval_notes)
- {
- REG_NOTES (first) = gen_rtx_INSN_LIST (REG_LIBCALL, last,
- REG_NOTES (first));
- REG_NOTES (last) = gen_rtx_INSN_LIST (REG_RETVAL, first,
- REG_NOTES (last));
- }
- }
+ maybe_encapsulate_block (first, last, equiv);
}
\f
/* Nonzero if we can perform a comparison of mode MODE straightforwardly.