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| author | Paolo Bonzini <bonzini@gnu.org> | 2006-04-18 08:23:39 +0000 |
|---|---|---|
| committer | Paolo Bonzini <bonzini@gcc.gnu.org> | 2006-04-18 08:23:39 +0000 |
| commit | 6ee2e1587ab08fb846788debf4778dec63dcec53 (patch) | |
| tree | 9cf5cf16274c44ee1026b11a9f22a35865c4e991 /gcc/regclass.c | |
| parent | e3949961fb3341f3c445a7ddd1537068440b268e (diff) | |
| download | gcc-6ee2e1587ab08fb846788debf4778dec63dcec53.zip gcc-6ee2e1587ab08fb846788debf4778dec63dcec53.tar.gz gcc-6ee2e1587ab08fb846788debf4778dec63dcec53.tar.bz2 | |
re PR target/27117 (SH backend cheats to reload -- disables indexed addressing but uses it internally)
2006-04-18 Paolo Bonzini <bonzini@gnu.org>
PR target/27117
Partial revert of revision 112637
2006-04-03 Paolo Bonzini <bonzini@gnu.org>
Dale Johannesen <dalej@apple.com>
PR target/19653
* regclass.c (struct reg_pref): Update documentation.
(regclass): Set prefclass to NO_REGS if memory is the best option.
(record_reg_classes): Cope with a prefclass set to NO_REGS.
From-SVN: r113026
Diffstat (limited to 'gcc/regclass.c')
| -rw-r--r-- | gcc/regclass.c | 14 |
1 files changed, 4 insertions, 10 deletions
diff --git a/gcc/regclass.c b/gcc/regclass.c index 8a0bab1..7b2d5b1 100644 --- a/gcc/regclass.c +++ b/gcc/regclass.c @@ -811,8 +811,7 @@ struct costs /* Structure used to record preferences of given pseudo. */ struct reg_pref { - /* (enum reg_class) prefclass is the preferred class. May be - NO_REGS if no class is better than memory. */ + /* (enum reg_class) prefclass is the preferred class. */ char prefclass; /* altclass is a register class that we should use for allocating @@ -1315,10 +1314,6 @@ regclass (rtx f, int nregs) best = reg_class_subunion[(int) best][class]; } - /* If no register class is better than memory, use memory. */ - if (p->mem_cost < best_cost) - best = NO_REGS; - /* Record the alternate register class; i.e., a class for which every register in it is better than using memory. If adding a class would make a smaller class (i.e., no union of just those @@ -1529,7 +1524,7 @@ record_reg_classes (int n_alts, int n_ops, rtx *ops, to what we would add if this register were not in the appropriate class. */ - if (reg_pref && reg_pref[REGNO (op)].prefclass != NO_REGS) + if (reg_pref) alt_cost += (may_move_in_cost[mode] [(unsigned char) reg_pref[REGNO (op)].prefclass] @@ -1755,7 +1750,7 @@ record_reg_classes (int n_alts, int n_ops, rtx *ops, to what we would add if this register were not in the appropriate class. */ - if (reg_pref && reg_pref[REGNO (op)].prefclass != NO_REGS) + if (reg_pref) alt_cost += (may_move_in_cost[mode] [(unsigned char) reg_pref[REGNO (op)].prefclass] @@ -1841,8 +1836,7 @@ record_reg_classes (int n_alts, int n_ops, rtx *ops, int class; unsigned int nr; - if (regno >= FIRST_PSEUDO_REGISTER && reg_pref != 0 - && reg_pref[regno].prefclass != NO_REGS) + if (regno >= FIRST_PSEUDO_REGISTER && reg_pref != 0) { enum reg_class pref = reg_pref[regno].prefclass; |