sprite_class.thumb.cpp

void sprite::copy_the_oam_entry_to_oam_mirror ( u32 slot_for_oam_mirror )
{
	//oam_mirror [slot_for_oam_mirror].attr0 = the_oam_entry.attr0;
	//oam_mirror [slot_for_oam_mirror].attr1 = the_oam_entry.attr1;
	//oam_mirror [slot_for_oam_mirror].attr2 = the_oam_entry.attr2;
	
	//u32 output;
	//asm __volatile__
	//(
	//	"mov r0, %1\n\t"
	//	"mov %0, r0\n\t"
	//	: "=r" (output)
	//	: "r" (slot_for_oam_mirror)
	//	: "r0"
	//);
	
	
	asm __volatile__
	(
		// Get the address of this->the_oam_entry
		"add r0, #36\n\t"
		
		
		// Load the address of the oam_mirror into r2
		"ldr r2, =oam_mirror\n\t"
		
		// The size of an oam_entry is 8 bytes, so multiply
		// slot_for_oam_mirror by 8
		"lsl r1, #0x3\n\t"
		
		// Get the address of the particular oam_entry
		"add r2, r1\n\t"
		
		// At this point, r0 contains &(this->the_oam_entry) and r2
		// contains &( oam_mirror [slot_for_oam_mirror] )
		
		
		// attr0 and attr1
		"ldr r1, [r0]\n\t"
		"str r1, [r2]\n\t"
		
		// attr2
		"ldrh r1, [r0, #0x4]\n\t"
		"strh r1, [r2, #0x4]\n\t"
		
		:
		: //"r" (&the_oam_entry) 				// inputs
		: "r0", "r1", "r2"					// clobbers
		
	);
	
}