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Fix the stats collection for fast-isel. The failed count was only accounting

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for a single miss and not all predecessor instructions that get selected by
the selection DAG instruction selector.  This is still not exact (e.g., over
states misses when folded/dead instructions are present), but it is a step in
the right direction.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144832 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chad Rosier 2011-11-16 21:02:08 +00:00
parent 2929de422e
commit f91488cc10
1 changed files with 18 additions and 5 deletions
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23
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
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@ -892,13 +892,16 @@ void SelectionDAGISel::SelectAllBasicBlocks(const Function &Fn) {
FastIS->setLastLocalValue(0);
}
unsigned NumFastIselRemaining = std::distance(Begin, End);
// Do FastISel on as many instructions as possible.
for (; BI != Begin; --BI) {
const Instruction *Inst = llvm::prior(BI);
// If we no longer require this instruction, skip it.
if (isFoldedOrDeadInstruction(Inst, FuncInfo))
if (isFoldedOrDeadInstruction(Inst, FuncInfo)) {
--NumFastIselRemaining;
continue;
}
// Bottom-up: reset the insert pos at the top, after any local-value
// instructions.
@ -906,6 +909,7 @@ void SelectionDAGISel::SelectAllBasicBlocks(const Function &Fn) {
// Try to select the instruction with FastISel.
if (FastIS->SelectInstruction(Inst)) {
--NumFastIselRemaining;
++NumFastIselSuccess;
// If fast isel succeeded, skip over all the folded instructions, and
// then see if there is a load right before the selected instructions.
@ -918,15 +922,18 @@ void SelectionDAGISel::SelectAllBasicBlocks(const Function &Fn) {
}
if (BeforeInst != Inst && isa<LoadInst>(BeforeInst) &&
BeforeInst->hasOneUse() &&
TryToFoldFastISelLoad(cast<LoadInst>(BeforeInst), Inst, FastIS))
TryToFoldFastISelLoad(cast<LoadInst>(BeforeInst), Inst, FastIS)) {
// If we succeeded, don't re-select the load.
BI = llvm::next(BasicBlock::const_iterator(BeforeInst));
--NumFastIselRemaining;
++NumFastIselSuccess;
}
continue;
}
// Then handle certain instructions as single-LLVM-Instruction blocks.
if (isa<CallInst>(Inst)) {
++NumFastIselFailures;
if (EnableFastISelVerbose || EnableFastISelAbort) {
dbgs() << "FastISel missed call: ";
Inst->dump();
@ -941,24 +948,30 @@ void SelectionDAGISel::SelectAllBasicBlocks(const Function &Fn) {
bool HadTailCall = false;
SelectBasicBlock(Inst, BI, HadTailCall);
// Recompute NumFastIselRemaining as Selection DAG instruction
// selection may have handled the call, input args, etc.
unsigned RemainingNow = std::distance(Begin, BI);
NumFastIselFailures += NumFastIselRemaining - RemainingNow;
// If the call was emitted as a tail call, we're done with the block.
if (HadTailCall) {
--BI;
break;
}
NumFastIselRemaining = RemainingNow;
continue;
}
if (isa<TerminatorInst>(Inst) && !isa<BranchInst>(Inst)) {
// Don't abort, and use a different message for terminator misses.
++NumFastIselFailures;
NumFastIselFailures += NumFastIselRemaining;
if (EnableFastISelVerbose || EnableFastISelAbort) {
dbgs() << "FastISel missed terminator: ";
Inst->dump();
}
} else {
++NumFastIselFailures;
NumFastIselFailures += NumFastIselRemaining;
if (EnableFastISelVerbose || EnableFastISelAbort) {
dbgs() << "FastISel miss: ";
Inst->dump();