Added more tests

src/build/arch/x64/Move.go

@@ -1,43 +1,23 @@
 package x64
 
-import "git.akyoto.dev/cli/q/src/build/cpu"
+import (
+	"encoding/binary"
+
+	"git.akyoto.dev/cli/q/src/build/cpu"
+)
 
 // MoveRegisterNumber32 moves a 32 bit integer into the given register.
 func MoveRegisterNumber32(code []byte, destination cpu.Register, number uint32) []byte {
-	if destination >= 8 {
+	if destination > 0b111 {
 		code = append(code, REX(0, 0, 0, 1))
-		destination -= 8
+		destination &= 0b111
 	}
 
-	return append(
-		code,
-		0xb8+byte(destination),
-		byte(number),
-		byte(number>>8),
-		byte(number>>16),
-		byte(number>>24),
-	)
+	code = append(code, 0xb8+byte(destination))
+	return binary.LittleEndian.AppendUint32(code, number)
 }
 
 // MoveRegisterRegister64 moves a register value into another register.
 func MoveRegisterRegister64(code []byte, destination cpu.Register, source cpu.Register) []byte {
-	r := byte(0) // Extension to the "reg" field in ModRM.
-	b := byte(0) // Extension to the "rm" field in ModRM or the SIB base (r8 up to r15 use this).
-
-	if source >= 8 {
-		r = 1
-		source -= 8
-	}
-
-	if destination >= 8 {
-		b = 1
-		destination -= 8
-	}
-
-	return append(
-		code,
-		REX(1, r, 0, b),
-		0x89,
-		ModRM(0b11, byte(source), byte(destination)),
-	)
+	return regReg(code, byte(source), byte(destination), 0x89)
 }