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vpx/vp8/encoder/arm/neon/fastfdct8x4_neon.asm
Tero Rintaluoma 11a222f5d9 Adds "armvX-none-rvct" targets 
Adds following targets to configure script to support RVCT compilation
without operating system support (for Profiler or bare metal images).
 - armv5te-none-rvct
 - armv6-none-rvct
 - armv7-none-rvct

To strip OS specific parts from the code "os_support"-config was added
to script and CONFIG_OS_SUPPORT flag is used in the code to exclude OS
specific parts such as OS specific includes and function calls for
timers and threads etc. This was done to enable RVCT compilation for
profiling purposes or running the image on bare metal target with
Lauterbach.

Removed separate AREA directives for READONLY data in armv6 and neon
assembly files to fix the RVCT compilation. Otherwise
"ldr <reg>, =label" syntax would have been needed to prevent linker
errors. This syntax is not supported by older gnu assemblers.

Change-Id: I14f4c68529e8c27397502fbc3010a54e505ddb43
2011-01-28 12:47:39 +02:00

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NASM
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;
; Copyright (c) 2010 The WebM project authors. All Rights Reserved.
;
; Use of this source code is governed by a BSD-style license
; that can be found in the LICENSE file in the root of the source
; tree. An additional intellectual property rights grant can be found
; in the file PATENTS. All contributing project authors may
; be found in the AUTHORS file in the root of the source tree.
;
EXPORT |vp8_fast_fdct8x4_neon|
ARM
REQUIRE8
PRESERVE8
AREA ||.text||, CODE, READONLY, ALIGN=2
;void vp8_fast_fdct4x4_c(short *input, short *output, int pitch);
;NOTE:
;The input *src_diff. src_diff is calculated as:
;diff_ptr[c] = src_ptr[c] - pred_ptr[c]; (in Subtract* function)
;In which *src_ptr and *pred_ptr both are unsigned char.
;Therefore, *src_diff should be in the range of [-255, 255].
;CAUTION:
;The input values of 25th block are set in vp8_build_dcblock function, which are out of [-255, 255].
;But, VP8 encoder only uses vp8_short_fdct4x4_c for 25th block, not vp8_fast_fdct4x4_c. That makes
;it ok for assuming *input in [-255, 255] in vp8_fast_fdct4x4_c, but not ok in vp8_short_fdct4x4_c.
|vp8_fast_fdct8x4_neon| PROC
vld1.16 {q1}, [r0], r2 ;load input
ldr r12, _ffdct8_coeff_
vld1.16 {q2}, [r0], r2
vld1.16 {q3}, [r0], r2
vld1.16 {d0}, [r12]
vld1.16 {q4}, [r0], r2
;First for-loop
;transpose d2, d4, d6, d8. Then, d2=ip[0], d4=ip[1], d6=ip[2], d8=ip[3]
;transpose d3, d5, d7, d9. Then, d3=ip[0], d5=ip[1], d7=ip[2], d9=ip[3]
vtrn.32 d2, d6
vtrn.32 d3, d7
vtrn.32 d4, d8
vtrn.32 d5, d9
vtrn.16 d2, d4
vtrn.16 d3, d5
vtrn.16 d6, d8
vtrn.16 d7, d9
vadd.s16 d10, d2, d8 ;ip[0]+ip[3]
vadd.s16 d11, d4, d6 ;ip[1]+ip[2]
vsub.s16 d12, d4, d6 ;ip[1]-ip[2]
vsub.s16 d13, d2, d8 ;ip[0]-ip[3]
vadd.s16 d22, d3, d9
vadd.s16 d23, d5, d7
vsub.s16 d24, d5, d7
vsub.s16 d25, d3, d9
vshl.i16 q5, q5, #1 ; a1, b1
vshl.i16 q6, q6, #1 ; c1, d1
vshl.i16 q1, q11, #1
vshl.i16 q2, q12, #1
vadd.s16 d14, d10, d11 ;temp1 = a1 + b1
vsub.s16 d15, d10, d11 ;temp2 = a1 - b1
vadd.s16 d24, d2, d3
vsub.s16 d25, d2, d3
vqdmulh.s16 q8, q7, d0[1]
vqdmulh.s16 q13, q12, d0[1]
vqdmulh.s16 q10, q6, d0[0]
vqdmulh.s16 q15, q2, d0[0]
vqdmulh.s16 q9, q6, d0[2]
vqdmulh.s16 q14, q2, d0[2]
vshr.s16 q8, q8, #1
vshr.s16 q13, q13, #1
vshr.s16 q10, q10, #1
vshr.s16 q15, q15, #1
vshr.s16 q9, q9, #1 ;d18:temp1 = ( c1 * x_c3)>>16; d19:temp1 = (d1 * x_c3)>>16
vshr.s16 q14, q14, #1 ;d28:temp1 = ( c1 * x_c3)>>16; d29:temp1 = (d1 * x_c3)>>16
vadd.s16 q10, q6, q10 ;d20:temp2 = ((c1 * x_c1)>>16) + c1; d21:temp2 = ((d1 * x_c1)>>16) + d1
vadd.s16 q15, q2, q15 ;d30:temp2 = ((c1 * x_c1)>>16) + c1; d31:temp2 = ((d1 * x_c1)>>16) + d1
vadd.s16 d2, d14, d16 ;op[0] = ((temp1 * x_c2 )>>16) + temp1
vadd.s16 d3, d24, d26 ;op[0] = ((temp1 * x_c2 )>>16) + temp1
vadd.s16 d6, d15, d17 ;op[2] = ((temp2 * x_c2 )>>16) + temp2
vadd.s16 d7, d25, d27 ;op[2] = ((temp2 * x_c2 )>>16) + temp2
vadd.s16 d4, d18, d21 ;op[1] = temp1 + temp2 -- q is not necessary, just for protection
vadd.s16 d5, d28, d31 ;op[1] = temp1 + temp2 -- q is not necessary, just for protection
vsub.s16 d8, d19, d20 ;op[3] = temp1 - temp2
vsub.s16 d9, d29, d30 ;op[3] = temp1 - temp2
;Second for-loop
;transpose d2, d4, d6, d8. Then, d2=ip[0], d4=ip[4], d6=ip[8], d8=ip[12]
;transpose d3, d5, d7, d9. Then, d3=ip[0], d5=ip[4], d7=ip[8], d9=ip[12]
vtrn.32 d2, d6
vtrn.32 d3, d7
vtrn.32 d4, d8
vtrn.32 d5, d9
vtrn.16 d2, d4
vtrn.16 d3, d5
vtrn.16 d6, d8
vtrn.16 d7, d9
vadd.s16 d10, d2, d8 ;a1 = ip[0]+ip[12]
vadd.s16 d11, d4, d6 ;b1 = ip[4]+ip[8]
vsub.s16 d12, d4, d6 ;c1 = ip[4]-ip[8]
vsub.s16 d13, d2, d8 ;d1 = ip[0]-ip[12]
vadd.s16 d2, d3, d9
vadd.s16 d4, d5, d7
vsub.s16 d24, d5, d7
vsub.s16 d25, d3, d9
vadd.s16 d14, d10, d11 ;temp1 = a1 + b1
vsub.s16 d15, d10, d11 ;temp2 = a1 - b1
vadd.s16 d22, d2, d4
vsub.s16 d23, d2, d4
vqdmulh.s16 q8, q7, d0[1]
vqdmulh.s16 q13, q11, d0[1]
vqdmulh.s16 q10, q6, d0[0]
vqdmulh.s16 q15, q12, d0[0]
vqdmulh.s16 q9, q6, d0[2]
vqdmulh.s16 q14, q12, d0[2]
vshr.s16 q8, q8, #1
vshr.s16 q13, q13, #1
vshr.s16 q10, q10, #1
vshr.s16 q15, q15, #1
vshr.s16 q9, q9, #1 ;d18:temp1 = ( c1 * x_c3)>>16; d19:temp1 = (d1 * x_c3)>>16
vshr.s16 q14, q14, #1 ;d28:temp1 = ( c1 * x_c3)>>16; d29:temp1 = (d1 * x_c3)>>16
vadd.s16 q10, q6, q10 ;d20:temp2 = ((c1 * x_c1)>>16) + c1; d21:temp2 = ((d1 * x_c1)>>16) + d1
vadd.s16 q15, q12, q15 ;d30:temp2 = ((c1 * x_c1)>>16) + c1; d31:temp2 = ((d1 * x_c1)>>16) + d1
vadd.s16 d2, d14, d16 ;a2 = ((temp1 * x_c2 )>>16) + temp1
vadd.s16 d6, d22, d26 ;a2 = ((temp1 * x_c2 )>>16) + temp1
vadd.s16 d4, d15, d17 ;c2 = ((temp2 * x_c2 )>>16) + temp2
vadd.s16 d8, d23, d27 ;c2 = ((temp2 * x_c2 )>>16) + temp2
vadd.s16 d3, d18, d21 ;b2 = temp1 + temp2 -- q is not necessary, just for protection
vadd.s16 d7, d28, d31 ;b2 = temp1 + temp2 -- q is not necessary, just for protection
vsub.s16 d5, d19, d20 ;d2 = temp1 - temp2
vsub.s16 d9, d29, d30 ;d2 = temp1 - temp2
vclt.s16 q5, q1, #0
vclt.s16 q6, q2, #0
vclt.s16 q7, q3, #0
vclt.s16 q8, q4, #0
vsub.s16 q1, q1, q5
vsub.s16 q2, q2, q6
vsub.s16 q3, q3, q7
vsub.s16 q4, q4, q8
vshr.s16 q1, q1, #1
vshr.s16 q2, q2, #1
vshr.s16 q3, q3, #1
vshr.s16 q4, q4, #1
vst1.16 {q1, q2}, [r1]!
vst1.16 {q3, q4}, [r1]
bx lr
ENDP
;-----------------
_ffdct8_coeff_
DCD ffdct8_coeff
ffdct8_coeff
; 60547 = 0xEC83
; 46341 = 0xB505
; 25080 = 0x61F8
DCD 0xB505EC83, 0x000061F8
END
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