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Remove unnecessary local variables to work around an icc optimization bug.

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Buildfarm member dunlin has been crashing since commit 8b49a60, but other
machines seem fine with that code.  It turns out that removing the local
variables in ordered_set_startup() that are copies of fields in "qstate"
dodges the problem.  This might cost a few cycles on register-rich
machines, but it's probably a wash on others, and in any case this code
isn't performance-critical.  Thanks to Jeremy Drake for off-list
investigation.
This commit is contained in:
Tom Lane
2014-01-09 12:59:55 -05:00
parent 192b4aacad
commit faab7a957d
1 changed files with 15 additions and 25 deletions
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40
src/backend/utils/adt/orderedsetaggs.c
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@@ -159,27 +159,17 @@ ordered_set_startup(FunctionCallInfo fcinfo, bool use_tuples)
if (use_tuples)
{
bool ishypothetical = (aggref->aggkind == AGGKIND_HYPOTHETICAL);
AttrNumber *sortColIdx;
Oid *sortOperators;
Oid *eqOperators;
Oid *sortCollations;
bool *sortNullsFirsts;
ListCell *lc;
int i;
if (ishypothetical)
numSortCols++; /* make space for flag column */
qstate->numSortCols = numSortCols;
qstate->sortColIdx = sortColIdx =
(AttrNumber *) palloc(numSortCols * sizeof(AttrNumber));
qstate->sortOperators = sortOperators =
(Oid *) palloc(numSortCols * sizeof(Oid));
qstate->eqOperators = eqOperators =
(Oid *) palloc(numSortCols * sizeof(Oid));
qstate->sortCollations = sortCollations =
(Oid *) palloc(numSortCols * sizeof(Oid));
qstate->sortNullsFirsts = sortNullsFirsts =
(bool *) palloc(numSortCols * sizeof(bool));
qstate->sortColIdx = (AttrNumber *) palloc(numSortCols * sizeof(AttrNumber));
qstate->sortOperators = (Oid *) palloc(numSortCols * sizeof(Oid));
qstate->eqOperators = (Oid *) palloc(numSortCols * sizeof(Oid));
qstate->sortCollations = (Oid *) palloc(numSortCols * sizeof(Oid));
qstate->sortNullsFirsts = (bool *) palloc(numSortCols * sizeof(bool));
i = 0;
foreach(lc, sortlist)
@@ -191,22 +181,22 @@ ordered_set_startup(FunctionCallInfo fcinfo, bool use_tuples)
/* the parser should have made sure of this */
Assert(OidIsValid(sortcl->sortop));
sortColIdx[i] = tle->resno;
sortOperators[i] = sortcl->sortop;
eqOperators[i] = sortcl->eqop;
sortCollations[i] = exprCollation((Node *) tle->expr);
sortNullsFirsts[i] = sortcl->nulls_first;
qstate->sortColIdx[i] = tle->resno;
qstate->sortOperators[i] = sortcl->sortop;
qstate->eqOperators[i] = sortcl->eqop;
qstate->sortCollations[i] = exprCollation((Node *) tle->expr);
qstate->sortNullsFirsts[i] = sortcl->nulls_first;
i++;
}
if (ishypothetical)
{
/* Add an integer flag column as the last sort column */
sortColIdx[i] = list_length(aggref->args) + 1;
sortOperators[i] = Int4LessOperator;
eqOperators[i] = Int4EqualOperator;
sortCollations[i] = InvalidOid;
sortNullsFirsts[i] = false;
qstate->sortColIdx[i] = list_length(aggref->args) + 1;
qstate->sortOperators[i] = Int4LessOperator;
qstate->eqOperators[i] = Int4EqualOperator;
qstate->sortCollations[i] = InvalidOid;
qstate->sortNullsFirsts[i] = false;
i++;
}