add_dependence (insn, reg_last_sets[regno], REG_DEP_OUTPUT);
reg_last_sets[regno] = insn;
+#if 0
+ /* ??? This code has two serious problems:
+ 1) It can cause an infinite loop if regno is mentioned in
+ its reg_known_value.
+ 2) It can cause execution time exponential in the size of the
+ input if there are long chains of reg_known_values pointing
+ to other reg_known_values.
+ This code was specifically added to handle fake argument pointers.
+ It may need to be rewritten to just handle that specific case. */
+
/* Pseudos that are REG_EQUIV to something may be replaced
by that during reloading, so we can potentially read
quantities mentioned in those addresses. */
if (reg_known_value[regno] != regno_reg_rtx[regno])
if (GET_CODE (reg_known_value[regno]) == MEM)
sched_analyze_2 (XEXP (reg_known_value[regno], 0), insn);
+#endif
/* Don't let it cross a call after scheduling if it doesn't
already cross one. */
if (reg_last_sets[regno])
add_dependence (insn, reg_last_sets[regno], 0);
+#if 0
+ /* ??? This code has two serious problems:
+ 1) It can cause an infinite loop if regno is mentioned in
+ its reg_known_value.
+ 2) It can cause execution time exponential in the size of the
+ input if there are long chains of reg_known_values pointing
+ to other reg_known_values.
+ This code was specifically added to handle fake argument pointers.
+ It may need to be rewritten to just handle that specific case. */
+
/* Pseudos that are REG_EQUIV to something may be replaced
by that, so we depend on anything mentioned there too. */
if (! reload_completed)
if (reg_known_value[regno] != regno_reg_rtx[regno])
sched_analyze_2 (reg_known_value[regno], insn);
+#endif
/* If the register does not already cross any calls, then add this
insn to the sched_before_next_call list so that it will still