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Siarhiej Siamaška ssvb

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ssvb / arm64-neon-throughput-test.S
Created January 19, 2016 14:43
/* Usage: gcc -DCPU_CLOCK_FREQUENCY=1008000000 arm64-neon-throughput-test.S && time ./a.out
*/
.cpu cortex-a53+fp+simd
.file "1.c"
.text
.align 2
.global main
.type main, %function
main:
@ssvb
ssvb / gist:d0f40bf056742afb7ed9
Created January 19, 2016 15:16
/* Usage: gcc -DCPU_CLOCK_FREQUENCY=1008000000 test.S && time ./a.out
*/
.cpu cortex-a53+fp+simd
.file "1.c"
.text
.align 2
.global main
.type main, %function
main:
@ssvb
ssvb / gist:67ebb38e8f8f2b9b5ee6
Created January 24, 2016 09:03
Work-in-progress U-Boot bootloader (still linked with the libdram blob) booting 32-bit Linux kernel on Pine64+ board
U-Boot SPL 2016.01-00352-ge77e0e4-dirty (Jan 24 2016 - 10:26:33)
DRAM:DRAM driver version: V1.0
DRAM Type = 3 (2:DDR2,3:DDR3,6:LPDDR2,7:LPDDR3)
DRAM clk = 672 MHz
DRAM zq value: 3b3bbb
DRAM single rank full DQ OK
DRAM size = 1024 MB
DRAM init ok
1024 MiB
Trying to boot from MMC
@ssvb
ssvb / remix-mini-dmesg.txt
Created January 31, 2016 09:14
dmesg output from Remix OS running on Jide Remix Mini
<6>[ 0.000000] Initializing cgroup subsys cpuset
<6>[ 0.000000] Initializing cgroup subsys cpu
<6>[ 0.000000] Initializing cgroup subsys cpuacct
<5>[ 0.000000] Linux version 3.10.93 (jenkins@pallas.corp.jide.com) (gcc version 4.9.3 20150113 (prerelease) (Linaro GCC 4.9-2015.01-3) ) #1 SMP PREEMPT Thu Jan 14 13:49:55 CST 2016
<4>[ 0.000000] CPU: AArch64 Processor [410fd034] revision 4
<6>[ 0.000000] Machine: sun50iw1p1
<6>[ 0.000000] bootconsole [earlycon0] enabled
<6>[ 0.000000] cma: CMA: reserved 300 MiB at ad400000
<7>[ 0.000000] On node 0 totalpages: 520192
<7>[ 0.000000] DMA zone: 7112 pages used for memmap
@ssvb
ssvb / div-loop.c
Created March 21, 2016 20:02
Maybe a test for Cortex-A7 erratum 823274: Load or store which fails condition code check might cause deadlock or data corruption ? To be run together with sun4i-ss
int main()
{
volatile double a = 1.0;
volatile double b = 1.0;
for (;;) {
a /= b;
}
return 0;
}
@ssvb
ssvb / tinymembench-backwards-c-reorder.diff
Created March 27, 2016 00:26
diff --git a/util.c b/util.c
index 52e88b4..ec7c6ff 100644
--- a/util.c
+++ b/util.c
@@ -59,26 +59,30 @@ void aligned_block_copy_backwards(int64_t * __restrict dst,
int size)
{
int64_t t1, t2, t3, t4;
- src += size / 8 - 1;
- dst += size / 8 - 1;
@ssvb
ssvb / test-arm-neon-mix.S
Created March 31, 2016 09:38
/*
* Usage: gcc -DCPU_CLOCK_FREQUENCY=1200000000 test-arm-neon-mix.S && time ./a.out
* gcc -DCPU_CLOCK_FREQUENCY=1200000000 -DINTERLEAVED test-arm-neon-mix.S && time ./a.out
*
* | -DINTERLEAVED | separate ARM and NEON code chunks
* ------------+---------------+-----------------------------------
* Cortex-A15 | ~6.7 cycles | ~5.7 cycles (!)
* ------------+---------------+-----------------------------------
* Cortex-A8 | 7.0 cycles | 7.0 cycles
* ------------+---------------+-----------------------------------
@ssvb
ssvb / gist:29b23a52912d5b4480bc56558d29fe7f
Created April 20, 2016 07:57
Coin Jam from https://www.go-hero.net/jam/16/name/RX14
$ cat coin_jam.cr
n = 16
j = 50
max_bound = (2**n - 1).to_u64
min_bound = (max_bound - 2**(n-1) + 2).to_u64
puts "Case #1:"
cur = min_bound
@ssvb
ssvb / bswap.rb
Created May 3, 2016 21:47
#!/usr/bin/env ruby
data = []
File.open(ARGV[0]).each_byte {|b| data.push(b) }
(0..(data.size - 1)).step(4) {|i|
x0 = data[i + 0]
x1 = data[i + 1]
x2 = data[i + 2]
x3 = data[i + 3]
@ssvb
ssvb / gist:5f68caade9c76fd671f68135a6d96643
Last active May 9, 2016 20:45
sunxi-tools 9e7f3a3a93290654c6a30a157484c46d37686d20
$ arm-linux-gnueabihf-gcc -v
Using built-in specs.
COLLECT_GCC=/usr/x86_64-pc-linux-gnu/arm-linux-gnueabihf/gcc-bin/4.7.4/arm-linux-gnueabihf-gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/arm-linux-gnueabihf/4.7.4/lto-wrapper
Target: arm-linux-gnueabihf
Configured with: /var/tmp/portage/cross-arm-linux-gnueabihf/gcc-4.7.4/work/gcc-4.7.4/configure --host=x86_64-pc-linux-gnu --target=arm-linux-gnueabihf --build=x86_64-pc-linux-gnu --prefix=/usr --bindir=/usr/x86_64-pc-linux-gnu/arm-linux-gnueabihf/gcc-bin/4.7.4 --includedir=/usr/lib/gcc/arm-linux-gnueabihf/4.7.4/include --datadir=/usr/share/gcc-data/arm-linux-gnueabihf/4.7.4 --mandir=/usr/share/gcc-data/arm-linux-gnueabihf/4.7.4/man --infodir=/usr/share/gcc-data/arm-linux-gnueabihf/4.7.4/info --with-gxx-include-dir=/usr/lib/gcc/arm-linux-gnueabihf/4.7.4/include/g++-v4 --with-python-dir=/share/gcc-data/arm-linux-gnueabihf/4.7.4/python --enable-languages=c,c++ --enable-obsolete --enable-secureplt --disable-werror -