cli/q
Code Issues 1 Pull Requests Activity

Implemented move with sign extension

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This commit is contained in:
Eduard Urbach
2024-07-28 21:09:42 +02:00
parent 32d7455c38
commit f1d4e65c1b
5 changed files with 45 additions and 5 deletions
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22
src/build/arch/x64/Move.go
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@ -9,12 +9,17 @@ import (
// MoveRegisterNumber moves an integer into the given register.
func MoveRegisterNumber(code []byte, destination cpu.Register, number int) []byte {
w := byte(0)
b := byte(0)
if SizeOf(int64(number)) == 8 {
w = 1
}
if w == 0 && number < 0 {
return MoveRegisterNumber32(code, destination, number)
}
b := byte(0)
if destination > 0b111 {
b = 1
destination &= 0b111
@ -33,6 +38,21 @@ func MoveRegisterNumber(code []byte, destination cpu.Register, number int) []byt
}
}
// MoveRegisterNumber32 moves an integer into the given register and sign-extends the register.
func MoveRegisterNumber32(code []byte, destination cpu.Register, number int) []byte {
b := byte(0)
if destination > 0b111 {
b = 1
destination &= 0b111
}
code = append(code, REX(1, 0, 0, b))
code = append(code, 0xC7)
code = append(code, ModRM(AddressDirect, 0, byte(destination)))
return binary.LittleEndian.AppendUint32(code, uint32(number))
}
// MoveRegisterRegister moves a register value into another register.
func MoveRegisterRegister(code []byte, destination cpu.Register, source cpu.Register) []byte {
return encode(code, AddressDirect, source, destination, 8, 0x89)