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(sched_analyze_1, sched_analyze_2): Ifdef out code added
for handling psuedo register equivalents that was added Dec 31 1992.

From-SVN: r3290
This commit is contained in:
Jim Wilson 1993-01-19 17:13:48 -08:00
parent c6ad27a7f3
commit edaf97c444
1 changed files with 22 additions and 0 deletions
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22
gcc/sched.c
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@ -1610,6 +1610,16 @@ sched_analyze_1 (x, insn)
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. */
@ -1617,6 +1627,7 @@ sched_analyze_1 (x, insn)
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. */
@ -1770,11 +1781,22 @@ sched_analyze_2 (x, insn)
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