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(record_reg_classes): When handling case of single SET between a hard register alone in a class and a pseudo... 

(record_reg_classes): When handling case of single SET
between a hard register alone in a class and a pseudo, make sure the
register is the only member of the class.

From-SVN: r8511
This commit is contained in:
Richard Kenner 1994-11-18 18:23:49 -05:00
parent 1ced4e9b04
commit 4841ba4b1d
1 changed files with 16 additions and 1 deletions
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17
gcc/regclass.c
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@ -1364,6 +1364,7 @@ record_reg_classes (n_alts, n_ops, ops, modes, constraints, insn)
int regno = REGNO (ops[!i]);
enum machine_mode mode = GET_MODE (ops[!i]);
int class;
int nr;
if (regno >= FIRST_PSEUDO_REGISTER && prefclass != 0
&& (reg_class_size[prefclass[regno]]
@ -1373,7 +1374,21 @@ record_reg_classes (n_alts, n_ops, ops, modes, constraints, insn)
for (class = 0; class < N_REG_CLASSES; class++)
if (TEST_HARD_REG_BIT (reg_class_contents[class], regno)
&& reg_class_size[class] == CLASS_MAX_NREGS (class, mode))
op_costs[i].cost[class] = -1;
{
if (reg_class_size[class] == 1)
op_costs[i].cost[class] = -1;
else
{
for (nr = 0; nr < HARD_REGNO_NREGS(regno, mode); nr++)
{
if (!TEST_HARD_REG_BIT (reg_class_contents[class], regno + nr))
break;
}
if (nr == HARD_REGNO_NREGS(regno,mode))
op_costs[i].cost[class] = -1;
}
}
}
}