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more MIPS assembler tweaks

$00 constant asm-copz-MF
$02 constant asm-copz-CF
$04 constant asm-copz-MT
$06 constant asm-copz-CT
$08 constant asm-copz-BC
$10 constant asm-copz-C0

$00 constant asm-copz-BCF
$01 constant asm-copz-BCT

$04 asm-op asm-I-rs,rt,imm		beq,
$05 asm-op asm-I-rs,rt,imm		bne,
$00 $06 asm-op asm-rt asm-I-rs,imm	blez,
$00 $07 asm-op asm-rt asm-I-rs,imm	bgtz,
$08 asm-op asm-I-rt,rs,imm		addi,
$09 asm-op asm-I-rt,rs,imm		addiu,
$0a asm-op asm-I-rt,rs,imm		slti,
$0b asm-op asm-I-rt,rs,imm		sltiu,
$0c asm-op asm-I-rt,rs,uimm		andi,
$0d asm-op asm-I-rt,rs,uimm		ori,
$0e asm-op asm-I-rt,rs,uimm		xori,
$0f asm-op asm-I-rt,uimm		lui,
$20 asm-op asm-I-rt,offset,rs		lb,
$21 asm-op asm-I-rt,offset,rs		lh,
$22 asm-op asm-I-rt,offset,rs		lwl,
$23 asm-op asm-I-rt,offset,rs		lw,
$24 asm-op asm-I-rt,offset,rs		lbu,
$25 asm-op asm-I-rt,offset,rs		lhu,
$26 asm-op asm-I-rt,offset,rs		lwr,
$28 asm-op asm-I-rt,offset,rs		sb,
$29 asm-op asm-I-rt,offset,rs		sh,
$2a asm-op asm-I-rt,offset,rs		swl,
$2b asm-op asm-I-rt,offset,rs		sw,
$2e asm-op asm-I-rt,offset,rs		swr,

$02 asm-op asm-J-target			j,
$03 asm-op asm-J-target			jal,

$00 asm-special-rd,rt,sa		sll,
$02 asm-special-rd,rt,sa		srl,
$03 asm-special-rd,rt,sa		sra,
$04 asm-special-rd,rt,rs		sllv,
$06 asm-special-rd,rt,rs		srlv,
$07 asm-special-rd,rt,rs		srav,
$08 asm-special-rs			jr,
$09 asm-special-rd,rs			jalr, \ !! rd,rs or rs,rd?
$0c asm-special-nothing			syscall,
$0d asm-special-nothing			break,
$10 asm-special-rd			mfhi,
$11 asm-special-rs			mthi,
$12 asm-special-rd			mflo,
$13 asm-special-rs			mtlo,
$18 asm-special-rs,rt			mult,
$19 asm-special-rs,rt			multu,
$1a asm-special-rs,rt			div,
$1b asm-special-rs,rt			divu,
$20 asm-special-rd,rs,rt		add,
$21 asm-special-rd,rs,rt		addu,
$22 asm-special-rd,rs,rt		sub,
$23 asm-special-rd,rs,rt		subu,
$24 asm-special-rd,rs,rt		and,
$25 asm-special-rd,rs,rt		or,
$26 asm-special-rd,rs,rt		xor,
$27 asm-special-rd,rs,rt		nor,
$2a asm-special-rd,rs,rt		slt,
$2b asm-special-rd,rs,rt		sltu,

$00 asm-regimm-rs,imm			bltz,
$01 asm-regimm-rs,imm			bgez,
$10 asm-regimm-rs,imm			bltzal,
$11 asm-regimm-rs,imm			bgezal,

$30 asm-copz-rt,offset,rs		lwcz,
$38 asm-copz-rt,offset,rs		swcz,
$31 asm-I-rt,offset,rs			lwc1,
$32 asm-I-rt,offset,rs			lwc2,
$39 asm-I-rt,offset,rs			swc1,
$3a asm-I-rt,offset,rs			swc2,
asm-copz-MF $00 asm-rs asm-copz-rt,rd	mfcz,
asm-copz-CF $00 asm-rs asm-copz-rt,rd	cfcz,
asm-copz-MT $00 asm-rs asm-copz-rt,rd	mtcz,
asm-copz-CT $00 asm-rs asm-copz-rt,rd	ctcz,
asm-copz-BC $00 asm-rs asm-copz-BCF swap asm-rt asm-copz-imm bczf,
asm-copz-BC $00 asm-rs asm-copz-BCT swap asm-rt asm-copz-imm bczt,
$01 asm-copz0				tlbr,
$02 asm-copz0				tlbwi,
$06 asm-copz0				tlbwr,
$08 asm-copz0				tlbl,