cli/q
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Removed unnecessary instructions

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This commit is contained in:
Eduard Urbach 2024-07-31 15:36:44 +02:00
parent 88be002c45
commit cdbfa744b7
Signed by: akyoto
GPG Key ID: C874F672B1AF20C0
1 changed files with 18 additions and 11 deletions
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29
src/build/register/RegisterNumber.go
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@ -11,20 +11,27 @@ func (f *Machine) RegisterNumber(mnemonic asm.Mnemonic, a cpu.Register, b int) {
f.SaveRegister(a)
}
if sizeof.Signed(int64(b)) == 8 {
tmp := f.NewRegister()
f.Assembler.RegisterNumber(asm.MOVE, tmp, b)
f.UseRegister(tmp)
f.postInstruction()
f.Assembler.RegisterRegister(mnemonic, a, tmp)
f.postInstruction()
f.FreeRegister(tmp)
} else {
// The `MOVE` operation is very flexible and works with any type of immediate number.
if mnemonic == asm.MOVE {
f.Assembler.RegisterNumber(mnemonic, a, b)
f.UseRegister(a)
f.postInstruction()
return
}
if mnemonic == asm.MOVE {
f.UseRegister(a)
// If the number only needs 32 bits, we can encode the instruction.
if sizeof.Signed(int64(b)) <= 4 {
f.Assembler.RegisterNumber(mnemonic, a, b)
f.postInstruction()
return
}
// If the number needs 64 bits, we need to use a temporary register.
tmp := f.NewRegister()
f.Assembler.RegisterNumber(asm.MOVE, tmp, b)
f.UseRegister(tmp)
f.postInstruction()
f.Assembler.RegisterRegister(mnemonic, a, tmp)
f.postInstruction()
f.FreeRegister(tmp)
}