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[CodeGen] Improve compilation time with VLIWMachineScheduler #66942

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kparzysz-quic merged 1 commit into from
Sep 21, 2023
Merged

[CodeGen] Improve compilation time with VLIWMachineScheduler #66942

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5 changes: 3 additions & 2 deletions llvm/include/llvm/CodeGen/VLIWMachineScheduler.h
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Original file line number Diff line number Diff line change
Expand Up @@ -165,8 +165,9 @@ class ConvergingVLIWScheduler : public MachineSchedStrategy {
// a slightly different heuristic for small and large functions. For small
// functions, it's important to use the height/depth of the instruction.
// For large functions, prioritizing by height or depth increases spills.
CriticalPathLength = DAG->getBBSize() / SchedModel->getIssueWidth();
if (DAG->getBBSize() < 50)
const auto BBSize = DAG->getBBSize();
CriticalPathLength = BBSize / SchedModel->getIssueWidth();
if (BBSize < 50)
// We divide by two as a cheap and simple heuristic to reduce the
// critcal path length, which increases the priority of using the graph
// height/depth in the scheduler's cost computation.
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