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package pass
import (
"sort"
"github.com/mmcloughlin/avo/ir"
)
// RequiredISAExtensions determines ISA extensions required for the given
// function. Populates the ISA field.
func RequiredISAExtensions(fn *ir.Function) error {
// Collect ISA set.
set := map[string]bool{}
for _, i := range fn.Instructions() {
for _, isa := range i.ISA {
set[isa] = true
}
}
if len(set) == 0 {
return nil
}
// Populate the function's ISA field with the unique sorted list.
for isa := range set {
fn.ISA = append(fn.ISA, isa)
}
sort.Strings(fn.ISA)
return nil
}
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