go/src/cmd/compile/internal/gc/compile.go

var compilequeue …

func enqueueFunc(fn *ir.Func) { … }

// prepareFunc handles any remaining frontend compilation tasks that
// aren't yet safe to perform concurrently.
func prepareFunc(fn *ir.Func) { … }

// compileFunctions compiles all functions in compilequeue.
// It fans out nBackendWorkers to do the work
// and waits for them to complete.
func compileFunctions(profile *pgoir.Profile) { … }