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Michael Hope, Toolchain
bzr branch lp:~michaelh1/+junk/intrinsics-demo
NEON Intrinsics
What's NEON?
●Ch 19 'Introducting NEON'
http://infocenter.arm.com/help/topic/com.arm.doc.den0013a/
SIMD is...
Same instruction, many values
Anything involving signals is great for
SIMD
Normalisation
● Easier to read and write
● Easier (better?) register allocation
● Compiler knows how to schedule
● ABI neutral
Advantages
Works across compilers
> gcc-mcpu=cortex-a9 -mfpu=neon -O3 -c test.c
> armcc --cpu Cortex-A9 --c99 -O3 -c test.c
> clang -mcpu=cortex-a9 -mfpu=neon -O3 -c test.c
Tune for the architecture
-mtune=cortex-a9
-mtune=cortex-a8
-mtune=cortex-a5
SMS, unrolling, profiling?
Writing
Environment
#include <arm_neon.h>
gcc -march=armv7-a -mfpu=neon
Data types
<type>x<lanes>_t (uint8x4_t)
<type>x<lanes>x<# registers>_t
(int16x2x4_t)
Some Instructions
Add
uint16x4_t vadd_u16 (
uint16x4_t left,
uint16x4_t right
)
Multiply
uint64x2_t vmlal_u32
(uint64x2_t,
uint32x2_t, uint32x2_t)
int32x4_t vqdmlal_s16
(int32x4_t,
int16x4_t, int16x4_t)
Strided load
uint8x8x2_t vld2_u8
(const uint8_t *)
Form of expected instruction(s):
vld2.8 {d0, d1}, [r0]
Documentation
GCC
http://gcc.gnu.org/onlinedocs/gcc/ARM-NEON-Intrinsics.html
ARM
http://infocenter.arm.com/help/topic/com.arm.doc.den0013a
Blog posts
Search for “Coding with NEON” on
http://blogs.arm.com
Writing
Colour space conversion
Y = 0.2126 R + 0.7152 G + 0.0722 B
HD television (ITU BT.709)
Versions
Nils Pipenbrinck
http://hilbert-space.de/?p=22
Q4.11: NEON Intrinsics
Q4.11: NEON Intrinsics
Q4.11: NEON Intrinsics
Performance
Plain C
48.481 s
Assembly
8.727 s (5.55 x faster)
Intrinsics
8.728 s (5.55 x faster)
Bigger Routines
“libpixelflinger: Add ARM NEON optimized
scanline_t32cb16”
http://wiki.linaro.org/RichardSandiford/Sandbox/IntrinsicsPerformance
Hand-written
2.831 s
Intrinsics
2.637 s (7.4 % faster)
Q4.11: NEON Intrinsics

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Q4.11: NEON Intrinsics