Calculate Accuracy for Physical

Routine used in formula 2B
001886d4: 27bdffe8 addiu r29,r29,0xffe8
001886d8: afbf0010 sw r31,0x0010(r29)
001886dc: 0c06217e jal 0x001885f8		Physical XA modification
001886e0: 00000000 nop
001886e4: 0c061967 jal 0x0018659c		XA + YA for status formula
001886e8: 00000000 nop
001886ec: 0c061d44 jal 0x00187510
001886f0: 00000000 nop
001886f4: 3c028019 lui r2,0x8019
001886f8: 8c422d90 lw r2,0x2d90(r2)		target action pointer
001886fc: 00000000 nop
00188700: 90420000 lbu r2,0x0000(r2)		load hit flag
00188704: 00000000 nop
00188708: 2c420001 sltiu r2,r2,0x0001		set if did not hit
0018870c: 8fbf0010 lw r31,0x0010(r29)
00188710: 27bd0018 addiu r29,r29,0x0018
00188714: 03e00008 jr r31
00188718: 00000000 nop