Improved code generation
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099ee729d4
commit
3e92c83c0d
@ -27,7 +27,7 @@ func (f *Function) ExpressionToRegister(node *expression.Expression, register cp
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right := node.Children[1]
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right := node.Children[1]
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final := register
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final := register
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if OverwritesRegister(right, register) {
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if f.UsesRegister(right, register) {
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register = f.cpu.MustFindFree(f.cpu.General)
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register = f.cpu.MustFindFree(f.cpu.General)
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}
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}
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@ -1,11 +0,0 @@
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package core
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import (
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"git.akyoto.dev/cli/q/src/build/cpu"
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"git.akyoto.dev/cli/q/src/build/expression"
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)
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// OverwritesRegister returns true if evaluating the expression would overwrite the given register.
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func OverwritesRegister(expr *expression.Expression, register cpu.Register) bool {
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return !expr.IsLeaf()
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}
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47
src/build/core/UsesRegister.go
Normal file
47
src/build/core/UsesRegister.go
Normal file
@ -0,0 +1,47 @@
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package core
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import (
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"git.akyoto.dev/cli/q/src/build/ast"
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"git.akyoto.dev/cli/q/src/build/cpu"
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"git.akyoto.dev/cli/q/src/build/expression"
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"git.akyoto.dev/cli/q/src/build/token"
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)
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// UsesRegister returns true if evaluating the expression would write or read the given register.
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func (f *Function) UsesRegister(expr *expression.Expression, register cpu.Register) bool {
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if expr.IsLeaf() {
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if expr.Token.Kind == token.Number {
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return false
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}
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name := expr.Token.Text()
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variable := f.variables[name]
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return register == variable.Register
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}
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if ast.IsFunctionCall(expr) {
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if register == f.cpu.Output[0] {
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return true
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}
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for i, parameter := range expr.Children[1:] {
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if register == f.cpu.Input[i] {
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return true
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}
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if f.UsesRegister(parameter, register) {
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return true
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}
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}
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return false
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}
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for _, child := range expr.Children {
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if f.UsesRegister(child, register) {
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return true
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}
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}
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return false
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}
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