Implemented arm64 instructions: ldp and stp

src/arm/LoadPair.go

@@ -0,0 +1,12 @@
+package arm
+
+import "git.urbach.dev/cli/q/src/cpu"
+
+// LoadPair calculates an address from a base register value and an immediate offset,
+// loads two 64-bit doublewords from memory, and writes them to two registers.
+// This is the post-index version of the instruction so the offset is applied to the base register after the memory access.
+func LoadPair(reg1 cpu.Register, reg2 cpu.Register, base cpu.Register, offset int) uint32 {
+	offset /= 8
+	offset &= 0b1111111
+	return 0b1010100011<<22 | (uint32(offset) << 15) | (uint32(reg2) << 10) | (uint32(base) << 5) | uint32(reg1)
+}