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(find_reg): When looking for locally-allocated hard regs to reclaim, 

use REG_ALLOC_ORDER to find least used.

From-SVN: r7210
This commit is contained in:
Richard Kenner 1994-05-04 16:45:28 -04:00
parent 761827969b
commit 17a0a76dd4
1 changed files with 32 additions and 23 deletions
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55
gcc/global.c
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@ -1079,31 +1079,40 @@ find_reg (allocno, losers, alt_regs_p, accept_call_clobbered, retrying)
{
/* Count from the end, to find the least-used ones first. */
for (i = FIRST_PSEUDO_REGISTER - 1; i >= 0; i--)
if (local_reg_n_refs[i] != 0
/* Don't use a reg no good for this pseudo. */
&& ! TEST_HARD_REG_BIT (used2, i)
&& HARD_REGNO_MODE_OK (i, mode)
&& ((double) local_reg_n_refs[i] / local_reg_live_length[i]
< ((double) allocno_n_refs[allocno]
/ allocno_live_length[allocno])))
{
/* Hard reg I was used less in total by local regs
than it would be used by this one allocno! */
int k;
for (k = 0; k < max_regno; k++)
if (reg_renumber[k] >= 0)
{
int regno = reg_renumber[k];
int endregno
= regno + HARD_REGNO_NREGS (regno, PSEUDO_REGNO_MODE (k));
{
#ifdef REG_ALLOC_ORDER
int regno = reg_alloc_order[i];
#else
int regno = i;
#endif
if (i >= regno && i < endregno)
reg_renumber[k] = -1;
}
if (local_reg_n_refs[regno] != 0
/* Don't use a reg no good for this pseudo. */
&& ! TEST_HARD_REG_BIT (used2, regno)
&& HARD_REGNO_MODE_OK (regno, mode)
&& (((double) local_reg_n_refs[regno]
/ local_reg_live_length[regno])
< ((double) allocno_n_refs[allocno]
/ allocno_live_length[allocno])))
{
/* Hard reg REGNO was used less in total by local regs
than it would be used by this one allocno! */
int k;
for (k = 0; k < max_regno; k++)
if (reg_renumber[k] >= 0)
{
int r = reg_renumber[k];
int endregno
= r + HARD_REGNO_NREGS (r, PSEUDO_REGNO_MODE (k));
best_reg = i;
break;
}
if (regno >= r && regno < endregno)
reg_renumber[k] = -1;
}
best_reg = regno;
break;
}
}
}
/* Did we find a register? */