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global.c (find_reg): Only evict for global regs.

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* global.c (find_reg): Only evict for global regs.
        Take n_refs into account and dump more info.

From-SVN: r110407
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Michael Matz 2006-01-30 17:35:37 +00:00 • committed by Michael Matz
parent 3b1a6677a7
commit b39f98f94d
2 changed files with 28 additions and 4 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2006-01-30 Michael Matz <matz@suse.de>
* global.c (find_reg): Only evict for global regs.
Take n_refs into account and dump more info.
2006-01-30 J"orn Rennecke <joern.rennecke@st.com>
PR target/14798:

27
gcc/global.c
View file

@ -1241,7 +1241,8 @@ find_reg (int num, HARD_REG_SET losers, int alt_regs_p, int accept_call_clobbere
so we can use it instead. */
if (best_reg < 0 && !retrying
/* Let's not bother with multi-reg allocnos. */
&& allocno[num].size == 1)
&& allocno[num].size == 1
&& REG_BASIC_BLOCK (allocno[num].reg) == REG_BLOCK_GLOBAL)
{
/* Count from the end, to find the least-used ones first. */
for (i = FIRST_PSEUDO_REGISTER - 1; i >= 0; i--)
@ -1278,9 +1279,9 @@ find_reg (int num, HARD_REG_SET losers, int alt_regs_p, int accept_call_clobbere
variables so as to avoid excess precision problems that occur
on an i386-unknown-sysv4.2 (unixware) host. */
double tmp1 = ((double) local_reg_freq[regno]
double tmp1 = ((double) local_reg_freq[regno] * local_reg_n_refs[regno]
/ local_reg_live_length[regno]);
double tmp2 = ((double) allocno[num].freq
double tmp2 = ((double) allocno[num].freq * allocno[num].n_refs
/ allocno[num].live_length);
if (tmp1 < tmp2)
@ -1288,6 +1289,19 @@ find_reg (int num, HARD_REG_SET losers, int alt_regs_p, int accept_call_clobbere
/* Hard reg REGNO was used less in total by local regs
than it would be used by this one allocno! */
int k;
if (dump_file)
{
fprintf (dump_file, "Regno %d better for global %d, ",
regno, allocno[num].reg);
fprintf (dump_file, "fr:%d, ll:%d, nr:%d ",
allocno[num].freq, allocno[num].live_length,
allocno[num].n_refs);
fprintf (dump_file, "(was: fr:%d, ll:%d, nr:%d)\n",
local_reg_freq[regno],
local_reg_live_length[regno],
local_reg_n_refs[regno]);
}
for (k = 0; k < max_regno; k++)
if (reg_renumber[k] >= 0)
{
@ -1296,7 +1310,12 @@ find_reg (int num, HARD_REG_SET losers, int alt_regs_p, int accept_call_clobbere
= r + hard_regno_nregs[r][PSEUDO_REGNO_MODE (k)];
if (regno >= r && regno < endregno)
reg_renumber[k] = -1;
{
if (dump_file)
fprintf (dump_file,
"Local Reg %d now on stack\n", k);
reg_renumber[k] = -1;
}
}
best_reg = regno;