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| author | Jim Wilson <wilson@gcc.gnu.org> | 1993-01-19 17:13:48 -0800 |
|---|---|---|
| committer | Jim Wilson <wilson@gcc.gnu.org> | 1993-01-19 17:13:48 -0800 |
| commit | edaf97c444037ec44ed25543d5909e10589d7e7c (patch) | |
| tree | ff7968ec9bda75028a592175e30e5d7969d32df4 /gcc/sched.c | |
| parent | c6ad27a7f35f4c2c4431fee9f0648989854c79ec (diff) | |
| download | gcc-edaf97c444037ec44ed25543d5909e10589d7e7c.zip gcc-edaf97c444037ec44ed25543d5909e10589d7e7c.tar.gz gcc-edaf97c444037ec44ed25543d5909e10589d7e7c.tar.bz2 | |
(sched_analyze_1...
(sched_analyze_1, sched_analyze_2): Ifdef out code added
for handling psuedo register equivalents that was added Dec 31 1992.
From-SVN: r3290
Diffstat (limited to 'gcc/sched.c')
| -rw-r--r-- | gcc/sched.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/gcc/sched.c b/gcc/sched.c index 7df147a..5483fc8 100644 --- a/gcc/sched.c +++ b/gcc/sched.c @@ -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 |