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b320bbaf61
Optimizes YUV to RGB conversion using ARMv5 multiply-accumulate
intructions for operations and data tables for saturation.
This first patch set includes the three versions i have developed.
Although iPod Classic need to use the latest version to reach 30fps,
old versions may serve other targets.
All versions are based on current SVN algorithm (round->scale->add)
using the same coefficients, so output results are identical.
Version history:
ARMv4:
- use all available registers to calculate four pixels within each
loop iteration.
- avoid LDR interlocks.
ARMv5TE:
- use ARMv5TE+ 1-cycle multiply-accumulate instructions.
ARMv5TE_WST:
- use data tables (256 bytes) for RBG565 saturation.
Benchmarks results using iPod Classic (ARM926EJ 216Mhz):
size test_fps (1) mpegplayer (2)
bytes YUV YUV1/4 average min/max
----- ----------- ------------------
SVN-20141107 528 27.8 110.0 11035 10864/13397
ARMv4 480 28.8 114.0 9767 9586/12126
ARMv5TE 468 29.7 117.5 8751 8584/11118
ARMv5TE_WST 544 33.6 133.0 6355 6316/6403
(1) boosted
(2) play full elephants_dream_320x240.mpg file (15693 frames) using
mpegplayer, patched RB measures YUV to RGB565 frame conversion
time (microseconds)
Compared against the WST version, the ARMV5TE version w/o cached
saturation tables is slower, but it is smaller and i have doubts
about the power consumption.
Change-Id: I2b6a81804636658d85a1bb104ccb2055e77ac120
Reviewed-on: http://gerrit.rockbox.org/1034
Reviewed-by: Cástor Muñoz <cmvidal@gmail.com>
Tested: Cástor Muñoz <cmvidal@gmail.com>
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| .. | ||
| archos/av300 | ||
| as3525 | ||
| at91sam | ||
| imx31 | ||
| imx233 | ||
| ipod | ||
| iriver | ||
| olympus | ||
| pbell | ||
| philips | ||
| pnx0101 | ||
| pp | ||
| rk27xx | ||
| s3c2440 | ||
| s5l8700 | ||
| s5l8702 | ||
| samsung | ||
| sandisk | ||
| tatung | ||
| tcc77x | ||
| tcc780x | ||
| tms320dm320 | ||
| ata-as-arm.S | ||
| ata-nand-telechips.c | ||
| bits-armv4.S | ||
| bits-armv6.S | ||
| crt0.S | ||
| i2c-telechips.c | ||
| lcd-c200_c200v2.c | ||
| lcd-ssd1815.c | ||
| mmu-arm.h | ||
| mmu-arm.S | ||
| mmu-armv6.S | ||
| pcm-telechips.c | ||
| powermgmt-ascodec.c | ||
| system-arm.c | ||
| system-arm.h | ||
| usb-drv-arc.c | ||
| usb-s3c6400x.c | ||
| usb-tcc.c | ||
| wmcodec-telechips.c | ||