shithub: riscv

ref: 49bd8a86f3a07c4f54df94838c07fa653d725afa
dir: /sys/src/games/doom/pal_arm64.s/

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TEXT	pal2xrgb+0(SB), 1, $-4
	MOV s+8(FP), R1
	MOV d+16(FP), R2
	MOVWU n+24(FP), R3
	MOVWU scale+32(FP), R4
	MOVWU $4, R5
	MULW R5, R4, R6 // 4*scale
	MULW R5, R6, R5
	SUBW R6, R5, R5 // 3*4*scale
	ADD R3, R1, R7 // s+n

	SUB R5, R2, R8
	ADD R6, R8, R9
	ADD R6, R9, R10
	ADD R6, R10, R11

_l:
	CMP R1, R7
	BEQ _end

	MOVWU (R1)4!, R3
	UBFXW $8, $8, R3, R4
	UBFXW $16, $8, R3, R12
	UBFXW $24, $8, R3, R13
	MOVBU R3, R3
	MOVWU (R0)[R3], R3
	ADD R5, R8
	ADD R5, R10
	MOVWU (R0)[R4], R4
	ADD R5, R9
	ADD R5, R11
	MOVWU (R0)[R12], R12
	ADD R6, R8, R18
	MOVWU (R0)[R13], R13

_s1:
	CMP R8, R18
	BEQ _l
	MOVWU R3, (R8)4!
	MOVWU R4, (R9)4!
	MOVWU R12, (R10)4!
	MOVWU R13, (R11)4!
	B _s1

_end:
	RETURN