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media/libvpx/vp8/encoder/x86/dct_mmx.asm@ac0c01689b40 (annotated)

media/libvpx/vp8/encoder/x86/dct_mmx.asm

Thu, 15 Jan 2015 15:59:08 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Thu, 15 Jan 2015 15:59:08 +0100

branch

TOR_BUG_9701

changeset 10

ac0c01689b40

permissions

-rw-r--r--

Implement a real Private Browsing Mode condition by changing the API/ABI;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

michael@0	1	;
michael@0	2	; Copyright (c) 2010 The WebM project authors. All Rights Reserved.
michael@0	3	;
michael@0	4	; Use of this source code is governed by a BSD-style license
michael@0	5	; that can be found in the LICENSE file in the root of the source
michael@0	6	; tree. An additional intellectual property rights grant can be found
michael@0	7	; in the file PATENTS. All contributing project authors may
michael@0	8	; be found in the AUTHORS file in the root of the source tree.
michael@0	9	;
michael@0	10
michael@0	11
michael@0	12	%include "vpx_ports/x86_abi_support.asm"
michael@0	13
michael@0	14	;void vp8_short_fdct4x4_mmx(short *input, short *output, int pitch)
michael@0	15	global sym(vp8_short_fdct4x4_mmx) PRIVATE
michael@0	16	sym(vp8_short_fdct4x4_mmx):
michael@0	17	push rbp
michael@0	18	mov rbp, rsp
michael@0	19	SHADOW_ARGS_TO_STACK 3
michael@0	20	GET_GOT rbx
michael@0	21	push rsi
michael@0	22	push rdi
michael@0	23	; end prolog
michael@0	24
michael@0	25	mov rsi, arg(0) ; input
michael@0	26	mov rdi, arg(1) ; output
michael@0	27
michael@0	28	movsxd rax, dword ptr arg(2) ;pitch
michael@0	29
michael@0	30	lea rcx, [rsi + rax*2]
michael@0	31	; read the input data
michael@0	32	movq mm0, [rsi]
michael@0	33	movq mm1, [rsi + rax]
michael@0	34
michael@0	35	movq mm2, [rcx]
michael@0	36	movq mm4, [rcx + rax]
michael@0	37
michael@0	38	; transpose for the first stage
michael@0	39	movq mm3, mm0 ; 00 01 02 03
michael@0	40	movq mm5, mm2 ; 20 21 22 23
michael@0	41
michael@0	42	punpcklwd mm0, mm1 ; 00 10 01 11
michael@0	43	punpckhwd mm3, mm1 ; 02 12 03 13
michael@0	44
michael@0	45	punpcklwd mm2, mm4 ; 20 30 21 31
michael@0	46	punpckhwd mm5, mm4 ; 22 32 23 33
michael@0	47
michael@0	48	movq mm1, mm0 ; 00 10 01 11
michael@0	49	punpckldq mm0, mm2 ; 00 10 20 30
michael@0	50
michael@0	51	punpckhdq mm1, mm2 ; 01 11 21 31
michael@0	52
michael@0	53	movq mm2, mm3 ; 02 12 03 13
michael@0	54	punpckldq mm2, mm5 ; 02 12 22 32
michael@0	55
michael@0	56	punpckhdq mm3, mm5 ; 03 13 23 33
michael@0	57
michael@0	58	; mm0 0
michael@0	59	; mm1 1
michael@0	60	; mm2 2
michael@0	61	; mm3 3
michael@0	62
michael@0	63	; first stage
michael@0	64	movq mm5, mm0
michael@0	65	movq mm4, mm1
michael@0	66
michael@0	67	paddw mm0, mm3 ; a1 = 0 + 3
michael@0	68	paddw mm1, mm2 ; b1 = 1 + 2
michael@0	69
michael@0	70	psubw mm4, mm2 ; c1 = 1 - 2
michael@0	71	psubw mm5, mm3 ; d1 = 0 - 3
michael@0	72
michael@0	73	psllw mm5, 3
michael@0	74	psllw mm4, 3
michael@0	75
michael@0	76	psllw mm0, 3
michael@0	77	psllw mm1, 3
michael@0	78
michael@0	79	; output 0 and 2
michael@0	80	movq mm2, mm0 ; a1
michael@0	81
michael@0	82	paddw mm0, mm1 ; op[0] = a1 + b1
michael@0	83	psubw mm2, mm1 ; op[2] = a1 - b1
michael@0	84
michael@0	85	; output 1 and 3
michael@0	86	; interleave c1, d1
michael@0	87	movq mm1, mm5 ; d1
michael@0	88	punpcklwd mm1, mm4 ; c1 d1
michael@0	89	punpckhwd mm5, mm4 ; c1 d1
michael@0	90
michael@0	91	movq mm3, mm1
michael@0	92	movq mm4, mm5
michael@0	93
michael@0	94	pmaddwd mm1, MMWORD PTR[GLOBAL (_5352_2217)] ; c1*2217 + d1*5352
michael@0	95	pmaddwd mm4, MMWORD PTR[GLOBAL (_5352_2217)] ; c1*2217 + d1*5352
michael@0	96
michael@0	97	pmaddwd mm3, MMWORD PTR[GLOBAL(_2217_neg5352)] ; d1*2217 - c1*5352
michael@0	98	pmaddwd mm5, MMWORD PTR[GLOBAL(_2217_neg5352)] ; d1*2217 - c1*5352
michael@0	99
michael@0	100	paddd mm1, MMWORD PTR[GLOBAL(_14500)]
michael@0	101	paddd mm4, MMWORD PTR[GLOBAL(_14500)]
michael@0	102	paddd mm3, MMWORD PTR[GLOBAL(_7500)]
michael@0	103	paddd mm5, MMWORD PTR[GLOBAL(_7500)]
michael@0	104
michael@0	105	psrad mm1, 12 ; (c1 * 2217 + d1 * 5352 + 14500)>>12
michael@0	106	psrad mm4, 12 ; (c1 * 2217 + d1 * 5352 + 14500)>>12
michael@0	107	psrad mm3, 12 ; (d1 * 2217 - c1 * 5352 + 7500)>>12
michael@0	108	psrad mm5, 12 ; (d1 * 2217 - c1 * 5352 + 7500)>>12
michael@0	109
michael@0	110	packssdw mm1, mm4 ; op[1]
michael@0	111	packssdw mm3, mm5 ; op[3]
michael@0	112
michael@0	113	; done with vertical
michael@0	114	; transpose for the second stage
michael@0	115	movq mm4, mm0 ; 00 10 20 30
michael@0	116	movq mm5, mm2 ; 02 12 22 32
michael@0	117
michael@0	118	punpcklwd mm0, mm1 ; 00 01 10 11
michael@0	119	punpckhwd mm4, mm1 ; 20 21 30 31
michael@0	120
michael@0	121	punpcklwd mm2, mm3 ; 02 03 12 13
michael@0	122	punpckhwd mm5, mm3 ; 22 23 32 33
michael@0	123
michael@0	124	movq mm1, mm0 ; 00 01 10 11
michael@0	125	punpckldq mm0, mm2 ; 00 01 02 03
michael@0	126
michael@0	127	punpckhdq mm1, mm2 ; 01 22 12 13
michael@0	128
michael@0	129	movq mm2, mm4 ; 20 31 30 31
michael@0	130	punpckldq mm2, mm5 ; 20 21 22 23
michael@0	131
michael@0	132	punpckhdq mm4, mm5 ; 30 31 32 33
michael@0	133
michael@0	134	; mm0 0
michael@0	135	; mm1 1
michael@0	136	; mm2 2
michael@0	137	; mm3 4
michael@0	138
michael@0	139	movq mm5, mm0
michael@0	140	movq mm3, mm1
michael@0	141
michael@0	142	paddw mm0, mm4 ; a1 = 0 + 3
michael@0	143	paddw mm1, mm2 ; b1 = 1 + 2
michael@0	144
michael@0	145	psubw mm3, mm2 ; c1 = 1 - 2
michael@0	146	psubw mm5, mm4 ; d1 = 0 - 3
michael@0	147
michael@0	148	pxor mm6, mm6 ; zero out for compare
michael@0	149
michael@0	150	pcmpeqw mm6, mm5 ; d1 != 0
michael@0	151
michael@0	152	pandn mm6, MMWORD PTR[GLOBAL(_cmp_mask)] ; clear upper,
michael@0	153	; and keep bit 0 of lower
michael@0	154
michael@0	155	; output 0 and 2
michael@0	156	movq mm2, mm0 ; a1
michael@0	157
michael@0	158	paddw mm0, mm1 ; a1 + b1
michael@0	159	psubw mm2, mm1 ; a1 - b1
michael@0	160
michael@0	161	paddw mm0, MMWORD PTR[GLOBAL(_7w)]
michael@0	162	paddw mm2, MMWORD PTR[GLOBAL(_7w)]
michael@0	163
michael@0	164	psraw mm0, 4 ; op[0] = (a1 + b1 + 7)>>4
michael@0	165	psraw mm2, 4 ; op[8] = (a1 - b1 + 7)>>4
michael@0	166
michael@0	167	movq MMWORD PTR[rdi + 0 ], mm0
michael@0	168	movq MMWORD PTR[rdi + 16], mm2
michael@0	169
michael@0	170	; output 1 and 3
michael@0	171	; interleave c1, d1
michael@0	172	movq mm1, mm5 ; d1
michael@0	173	punpcklwd mm1, mm3 ; c1 d1
michael@0	174	punpckhwd mm5, mm3 ; c1 d1
michael@0	175
michael@0	176	movq mm3, mm1
michael@0	177	movq mm4, mm5
michael@0	178
michael@0	179	pmaddwd mm1, MMWORD PTR[GLOBAL (_5352_2217)] ; c1*2217 + d1*5352
michael@0	180	pmaddwd mm4, MMWORD PTR[GLOBAL (_5352_2217)] ; c1*2217 + d1*5352
michael@0	181
michael@0	182	pmaddwd mm3, MMWORD PTR[GLOBAL(_2217_neg5352)] ; d1*2217 - c1*5352
michael@0	183	pmaddwd mm5, MMWORD PTR[GLOBAL(_2217_neg5352)] ; d1*2217 - c1*5352
michael@0	184
michael@0	185	paddd mm1, MMWORD PTR[GLOBAL(_12000)]
michael@0	186	paddd mm4, MMWORD PTR[GLOBAL(_12000)]
michael@0	187	paddd mm3, MMWORD PTR[GLOBAL(_51000)]
michael@0	188	paddd mm5, MMWORD PTR[GLOBAL(_51000)]
michael@0	189
michael@0	190	psrad mm1, 16 ; (c1 * 2217 + d1 * 5352 + 14500)>>16
michael@0	191	psrad mm4, 16 ; (c1 * 2217 + d1 * 5352 + 14500)>>16
michael@0	192	psrad mm3, 16 ; (d1 * 2217 - c1 * 5352 + 7500)>>16
michael@0	193	psrad mm5, 16 ; (d1 * 2217 - c1 * 5352 + 7500)>>16
michael@0	194
michael@0	195	packssdw mm1, mm4 ; op[4]
michael@0	196	packssdw mm3, mm5 ; op[12]
michael@0	197
michael@0	198	paddw mm1, mm6 ; op[4] += (d1!=0)
michael@0	199
michael@0	200	movq MMWORD PTR[rdi + 8 ], mm1
michael@0	201	movq MMWORD PTR[rdi + 24], mm3
michael@0	202
michael@0	203	; begin epilog
michael@0	204	pop rdi
michael@0	205	pop rsi
michael@0	206	RESTORE_GOT
michael@0	207	UNSHADOW_ARGS
michael@0	208	pop rbp
michael@0	209	ret
michael@0	210
michael@0	211	SECTION_RODATA
michael@0	212	align 8
michael@0	213	_5352_2217:
michael@0	214	dw 5352
michael@0	215	dw 2217
michael@0	216	dw 5352
michael@0	217	dw 2217
michael@0	218	align 8
michael@0	219	_2217_neg5352:
michael@0	220	dw 2217
michael@0	221	dw -5352
michael@0	222	dw 2217
michael@0	223	dw -5352
michael@0	224	align 8
michael@0	225	_cmp_mask:
michael@0	226	times 4 dw 1
michael@0	227	align 8
michael@0	228	_7w:
michael@0	229	times 4 dw 7
michael@0	230	align 8
michael@0	231	_14500:
michael@0	232	times 2 dd 14500
michael@0	233	align 8
michael@0	234	_7500:
michael@0	235	times 2 dd 7500
michael@0	236	align 8
michael@0	237	_12000:
michael@0	238	times 2 dd 12000
michael@0	239	align 8
michael@0	240	_51000:
michael@0	241	times 2 dd 51000