syoyo

std::vector<std::thread> workers;
std::atomic<unsigned int> i(0);

for (auto t = 0; t < std::thread::hardware_concurrency(); t++){
    workers.push_back(std::thread([&,t](){
        int index = 0;
        while((index = i++) < numItems){
           ...
        }
    }));

syoyo

// Simple Bilinear interpolation(e.g. texture filtering)
// w0 + w1 + w2 + w3 = 1.0f;
// a[0] ~ a[3] = alpha value of 2x2 pixels.

float ret = w0 * a[0] + w1 * a[1] + w2 * a[2] + w3 * a[3];

// Sometimes ret become 0x3ffffff if all a's are 1.0f(0x3f800000) due to numerical error?

syoyo

  // atan2(y, x) = 
  //
  //           y                                  y
  //       pi/2|\                             pi/2|\
  //           |                                  |
  //   pi      |       0                 pi       |        0
  //  ---------o---------> x       =>>   ---------o--------> x
  //  -pi      |      -0                 pi       |      2 pi
  //           |                                  |
  //           |                                  |

syoyo

# config.toml

baseurl = ""
languageCode = "en-us"
title = "Fah doc"
relativeURLs = true
uglyURLs = true

syoyo

gcloud compute instances create ${GCE_MASTER_INSTANCE_NAME} ...

# wait instance boot up
# fixme: there should be much better way
sleep 30

# shutdown after 60 min
# must add -f flag(background execution)
gcloud compute ssh ${GCE_MASTER_INSTANCE_NAME} --zone ${GCE_ZONE} --ssh-flag="-f" --command="sudo /sbin/shutdown -h -P +60"

syoyo

$ cat test.n 
(none 

; This top-level code is dynamic and compiled to Lua code
(function printhello ()
    ; all statements are symbolic expressions 
    ; known from Lisp and Scheme
    (print "None is as dynamic as this!"))

(static mymul(a b)

syoyo

#include <arm_neon.h>

typedef float float4 __attribute__((ext_vector_type(4)));


float4 mymax(float4 a, float4 b)
{
  float4 ret;
  ret = vmaxq_f32(a, b);
  return ret;

syoyo

//
// SPARC HPC-ACE
// FCCpx -Krestp=all -Kfast expf_test.cpp
//
fmath_exp aveDiff=      1e-06 maxDiff=3.891789e-06
new_exp   aveDiff=      2e-08 maxDiff=1.192089e-07
new_exp4  aveDiff=      2e-08 maxDiff=1.192078e-07
new_exp4d aveDiff=      2e-08 maxDiff=5.036628e-08
std::exp   0.197360
fmath_exp  0.110120

syoyo

//// new_exp
// == sim start ==

LLFB4
L32
LSSN114
L33
LSSN115
   00000001 :              ld     %f0
LSSN116

syoyo

00000610 <_new_exp>:
     610:       200b 0002       mov r1,0x0
     614:       200b 13c2       movt r1,0x3c00
     618:       59ab 0cc2       mov r2,0xcccd
     61c:       00a7            fmul r0,r0,r1
     61e:       712b 0882       mov r3,0x8889
     622:       610b 13d2       movt r3,0x3d08
     626:       498b 13e2       movt r2,0x3e4c
     62a:       200b 0002       mov r1,0x0
     62e:       300b 13f2       movt r1,0x3f80