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(find_reg): Store divide results in temporary variables. 

From-SVN: r7778
This commit is contained in:
Jim Wilson 1994-07-18 19:02:32 -07:00
parent 8c4f5c09f0
commit 7a17c5881c
1 changed files with 27 additions and 19 deletions
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46
gcc/global.c
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@ -1096,28 +1096,36 @@ find_reg (allocno, losers, alt_regs_p, accept_call_clobbered, retrying)
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_REGNO_MODE_OK (regno, mode))
{
/* 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));
/* We explicitly evaluate the divide results into temporary
variables so as to avoid excess precision problems that occur
on a i386-unknown-sysv4.2 (unixware) host. */
double tmp1 = ((double) local_reg_n_refs[regno]
/ local_reg_live_length[regno]);
double tmp2 = ((double) allocno_n_refs[allocno]
/ allocno_live_length[allocno]);
if (regno >= r && regno < endregno)
reg_renumber[k] = -1;
}
if (tmp1 < tmp2)
{
/* 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 = regno;
break;
if (regno >= r && regno < endregno)
reg_renumber[k] = -1;
}
best_reg = regno;
break;
}
}
}
}