73 lines
1.9 KiB
Go
73 lines
1.9 KiB
Go
package optimizer
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import "strings"
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// Optimize applies all enabled peephole passes to the generated ASM lines.
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// Each pass runs sequentially on a parsed representation of the lines.
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// @@OPT markers are stripped from output.
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// Returns optimized lines and the set of dissolved REGISTER variable names
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// (variables that had all their stores/loads eliminated).
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func Optimize(lines []SourceLine, cfg *Config) ([]string, map[string]bool) {
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dissolved := map[string]bool{}
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if cfg == nil || !cfg.Any() {
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return SourceLineTexts(lines), dissolved
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}
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parsed := parseLines(lines)
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original := parsed
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if cfg.EnableStoreLoad {
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parsed = passStoreReload(parsed, cfg)
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parsed = passStoreTransfer(parsed, cfg)
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}
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if cfg.EnableLoad {
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parsed = passLoadElimination(parsed, cfg)
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}
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if cfg.EnableImm {
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parsed = passImmElimination(parsed)
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}
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if cfg.EnableJmp {
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parsed = passJmpNext(parsed)
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}
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if cfg.EnableSelf {
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parsed = passSelfAssignment(parsed)
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}
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if cfg.EnableRegisterVars && len(cfg.RegisterVars) > 0 {
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parsed = passRegDead(parsed, cfg.RegisterVars)
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}
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parsed = stripOptMarkers(parsed)
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if cfg.Debug {
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original = stripOptMarkers(original)
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parsed = debugDiff(original, parsed)
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}
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resultLines := linesToString(parsed)
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if len(cfg.RegisterVars) > 0 {
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dissolved = computeDissolved(resultLines, cfg.RegisterVars)
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}
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return resultLines, dissolved
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}
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// computeDissolved finds REGISTER variables that have no remaining references
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// in the output and can have their memory allocation elided.
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func computeDissolved(outputLines []string, registerVars map[string]bool) map[string]bool {
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dissolved := map[string]bool{}
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for name := range registerVars {
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dissolved[name] = true
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}
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for _, line := range outputLines {
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for name := range dissolved {
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if strings.Contains(line, name) {
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delete(dissolved, name)
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}
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}
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if len(dissolved) == 0 {
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break
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}
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}
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return dissolved
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}
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