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[llvm-mca] Fix a rounding problem in SummaryView.cpp exposed by r333204.

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Before printing the block reciprocal throughput, ensure that the floating point
number is always rounded the same way on every target.
No functional change intended.

llvm-svn: 333210
This commit is contained in:
Andrea Di Biagio 2018-05-24 17:22:14 +00:00
parent cb201d8d91
commit 2aa4f29a7e
1 changed files with 7 additions and 4 deletions
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11
tools/llvm-mca/SummaryView.cpp
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@ -34,9 +34,9 @@ void SummaryView::onInstructionEvent(const HWInstructionEvent &Event) {
return;
// Update the cumulative number of resource cycles based on the processor
// resource usage information available from the instruction descriptor. We need to
// compute the cumulative number of resource cycles for every processor
// resource which is consumed by an instruction of the block.
// resource usage information available from the instruction descriptor. We
// need to compute the cumulative number of resource cycles for every
// processor resource which is consumed by an instruction of the block.
const Instruction &Inst = *Event.IR.getInstruction();
const InstrDesc &Desc = Inst.getDesc();
NumMicroOps += Desc.NumMicroOps;
@ -99,7 +99,10 @@ void SummaryView::printView(raw_ostream &OS) const {
TempStream << "\nTotal Cycles: " << TotalCycles;
TempStream << "\nDispatch Width: " << DispatchWidth;
TempStream << "\nIPC: " << format("%.2f", IPC);
TempStream << "\nBlock RThroughput: " << format("%.1f", BlockRThroughput)
// Round to the block reciprocal throughput to the nearest tenth.
TempStream << "\nBlock RThroughput: "
<< format("%.1f", floor((BlockRThroughput * 10) + 0.5) / 10)
<< '\n';
TempStream.flush();
OS << Buffer;