43 lines
893 B
Go
43 lines
893 B
Go
package build
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import (
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"git.akyoto.dev/cli/q/src/build/asm"
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"git.akyoto.dev/cli/q/src/build/config"
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"git.akyoto.dev/cli/q/src/build/cpu"
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)
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// SaveRegister attempts to move a variable occupying this register to another register.
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func (f *Function) SaveRegister(register cpu.Register) {
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if f.cpu.IsFree(register) {
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return
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}
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var variable *Variable
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for _, v := range f.variables {
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if v.Register == register {
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variable = v
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break
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}
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}
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if variable == nil || variable.Alive == 0 {
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return
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}
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newRegister, exists := f.cpu.FindFree(f.cpu.General)
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if !exists {
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panic("no free registers")
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}
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if config.Verbose {
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f.Logf("moving %s from %s to %s (alive: %d)", variable.Name, variable.Register, newRegister, variable.Alive)
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}
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f.assembler.RegisterRegister(asm.MOVE, newRegister, register)
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f.cpu.Free(register)
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f.cpu.Use(newRegister)
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variable.Register = newRegister
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}
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