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transform: use thinlto-pre-link passes

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This improves compilation performance by about 5% in my quick test,
while increasing binary size on average by  0.13% when comparing the
smoke tests in the drivers repo (and about two thirds of that 0.13% is
actually caused by a single smoke test).

I think this is a good idea because it aligns the TinyGo optimization
sequence with what ThinLTO expects.
This commit is contained in:
Ayke van Laethem
2024-07-28 10:48:31 +02:00
committed by Ayke
parent 6184a6cd35
commit 84c376160f
1 changed files with 5 additions and 3 deletions
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transform/optimizer.go
+5 -3
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@@ -142,11 +142,13 @@ func Optimize(mod llvm.Module, config *compileopts.Config) []error {
fn.SetLinkage(llvm.InternalLinkage)
}
// Run the default pass pipeline.
// TODO: set the PrepareForThinLTO flag somehow.
// Run the ThinLTO pre-link passes, meant to be run on each individual
// module. This saves compilation time compared to "default<#>" and is meant
// to better match the optimization passes that are happening during
// ThinLTO.
po := llvm.NewPassBuilderOptions()
defer po.Dispose()
passes := fmt.Sprintf("default<%s>", optLevel)
passes := fmt.Sprintf("thinlto-pre-link<%s>", optLevel)
err := mod.RunPasses(passes, llvm.TargetMachine{}, po)
if err != nil {
return []error{fmt.Errorf("could not build pass pipeline: %w", err)}