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add a statistic for the # times isel has to backtrack.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@99774 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-03-28 19:46:56 +00:00
parent c7eae5ca4a
commit bed993d8a4
1 changed files with 3 additions and 1 deletions
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4
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
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@ -61,6 +61,7 @@
using namespace llvm;
STATISTIC(NumFastIselFailures, "Number of instructions fast isel failed on");
STATISTIC(NumDAGIselRetries,"Number of times dag isel has to try another path");
static cl::opt<bool>
EnableFastISelVerbose("fast-isel-verbose", cl::Hidden,
@ -2198,7 +2199,7 @@ SelectCodeCommon(SDNode *NodeToMatch, const unsigned char *MatcherTable,
DEBUG(errs() << " Skipped scope entry (due to false predicate) at "
<< "index " << MatcherIndexOfPredicate
<< ", continuing at " << FailIndex << "\n");
++NumDAGIselRetries;
// Otherwise, we know that this case of the Scope is guaranteed to fail,
// move to the next case.
@ -2719,6 +2720,7 @@ SelectCodeCommon(SDNode *NodeToMatch, const unsigned char *MatcherTable,
// another child to try in the current 'Scope', otherwise pop it until we
// find a case to check.
DEBUG(errs() << " Match failed at index " << CurrentOpcodeIndex << "\n");
++NumDAGIselRetries;
while (1) {
if (MatchScopes.empty()) {
CannotYetSelect(NodeToMatch);