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cse.c (cse_insn): Initialise all regcost variables.

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* cse.c (cse_insn): Initialise all regcost variables.
        Fix a typo add missing '='.
        Only compare costs if there is a replacement insn.

From-SVN: r37694
This commit is contained in:
Graham Stott 2000-11-23 11:04:45 +00:00 committed by Graham Stott
parent f9b383f20f
commit 99a9c9460d
2 changed files with 29 additions and 13 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2000-11-23 Graham Stott <grahams@redhat.com>
* cse.c (cse_insn): Initialise all regcost variables.
Fix a typo add missing '='.
Only compare costs if there is a replacement insn.
Thu Nov 23 04:33:33 2000 Alexandre Oliva <aoliva@redhat.com>
* final.c (output_addr_const) [LABEL_REF]: Simplify.

36
gcc/cse.c
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@ -4941,10 +4941,16 @@ cse_insn (insn, libcall_insn)
rtx src_const = 0;
rtx src_related = 0;
struct table_elt *src_const_elt = 0;
int src_cost = MAX_COST, src_eqv_cost = MAX_COST, src_folded_cost = MAX_COST;
int src_related_cost = MAX_COST, src_elt_cost = MAX_COST;
int src_regcost, src_eqv_regcost, src_folded_regcost;
int src_related_regcost, src_elt_regcost;
int src_cost = MAX_COST;
int src_eqv_cost = MAX_COST;
int src_folded_cost = MAX_COST;
int src_related_cost = MAX_COST;
int src_elt_cost = MAX_COST;
int src_regcost = MAX_COST;
int src_eqv_regcost = MAX_COST;
int src_folded_regcost = MAX_COST;
int src_related_regcost = MAX_COST;
int src_elt_regcost = MAX_COST;
/* Set non-zero if we need to call force_const_mem on with the
contents of src_folded before using it. */
int src_folded_force_flag = 0;
@ -5395,7 +5401,7 @@ cse_insn (insn, libcall_insn)
/* If this was an indirect jump insn, a known label will really be
cheaper even though it looks more expensive. */
if (dest == pc_rtx && src_const && GET_CODE (src_const) == LABEL_REF)
src_folded = src_const, src_folded_cost = src_folded_regcost -1;
src_folded = src_const, src_folded_cost = src_folded_regcost = -1;
/* Terminate loop when replacement made. This must terminate since
the current contents will be tested and will always be valid. */
@ -5436,8 +5442,9 @@ cse_insn (insn, libcall_insn)
/* Find cheapest and skip it for the next time. For items
of equal cost, use this order:
src_folded, src, src_eqv, src_related and hash table entry. */
if (preferrable (src_folded_cost, src_folded_regcost,
src_cost, src_regcost) <= 0
if (src_folded
&& preferrable (src_folded_cost, src_folded_regcost,
src_cost, src_regcost) <= 0
&& preferrable (src_folded_cost, src_folded_regcost,
src_eqv_cost, src_eqv_regcost) <= 0
&& preferrable (src_folded_cost, src_folded_regcost,
@ -5449,20 +5456,23 @@ cse_insn (insn, libcall_insn)
if (src_folded_force_flag)
trial = force_const_mem (mode, trial);
}
else if (preferrable (src_cost, src_regcost,
src_eqv_cost, src_eqv_regcost) <= 0
else if (src
&& preferrable (src_cost, src_regcost,
src_eqv_cost, src_eqv_regcost) <= 0
&& preferrable (src_cost, src_regcost,
src_related_cost, src_related_regcost) <= 0
&& preferrable (src_cost, src_regcost,
src_elt_cost, src_elt_regcost) <= 0)
trial = src, src_cost = MAX_COST;
else if (preferrable (src_eqv_cost, src_eqv_regcost,
src_related_cost, src_related_regcost) <= 0
else if (src_eqv_here
&& preferrable (src_eqv_cost, src_eqv_regcost,
src_related_cost, src_related_regcost) <= 0
&& preferrable (src_eqv_cost, src_eqv_regcost,
src_elt_cost, src_elt_regcost) <= 0)
trial = copy_rtx (src_eqv_here), src_eqv_cost = MAX_COST;
else if (preferrable (src_related_cost, src_related_regcost,
src_elt_cost, src_elt_regcost) <= 0)
else if (src_related
&& preferrable (src_related_cost, src_related_regcost,
src_elt_cost, src_elt_regcost) <= 0)
trial = copy_rtx (src_related), src_related_cost = MAX_COST;
else
{