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stressVdt.cxx
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1 /// Simple program to benchmark vdt accuracy and cpu performance.
2 #include <vector>
3 #include <iostream>
4 #include <cmath> //for log2
5 #include <assert.h>
6 #include <limits>
7 #include <iostream>
8 #include <iomanip>
9 #include <map>
10 #include <string>
11 
12 #include "vdt/vdtMath.h"
13 
14 #include "TStopwatch.h"
15 #include "TRandom3.h"
16 #include "TH1F.h"
17 #include "TCanvas.h"
18 #include "TError.h"
19 
20 const double RANGE=3000.;
21 const uint32_t SIZE= 16777216;
22 
23 //------------------------------------------------------------------------------
24 // Not good for floating point, but just to get the bit difference
25 template <class T>
26 uint64_t fp2uint (T /*x*/)
27 {
28  T::not_implemented; // "Static assert" in C++03
29  return 0;
30 }
31 
32 template <>
33 uint64_t fp2uint<double> (double x)
34 {
35  return vdt::details::dp2uint64(x);
36 }
37 
38 template <>
39 uint64_t fp2uint<float> (float x)
40 {
41  return vdt::details::sp2uint32(x);
42 }
43 
44 //------------------------------------------------------------------------------
45 /// Returns most significative different bit
46 template <class T>
47 inline uint32_t diffbit(const T a,const T b )
48 {
49  uint64_t ia = fp2uint<T>(a);
50  uint64_t ib = fp2uint<T>(b);
51  uint64_t c = ia>ib? ia-ib : ib-ia;
52  return log2(c)+1;
53 }
54 
55 //------------------------------------------------------------------------------
56 // This allows to vectorise on very modern compilers (>=gcc 4.7)
57 // Note how the templating mechanism allows the compiler to *inline* the
58 // function. It is much more efficient than a void ptr or std::function!
59 template <typename T, typename F>
60 inline void calculateValues(F mathFunc,
61  const std::vector<T>& inputVector,
62  std::vector<T>& outputVector)
63 {
64 
65  const uint32_t size = inputVector.size();
66 
67  for (unsigned int i=0;i<size;++i){
68  outputVector[i]=mathFunc(inputVector[i]);
69  }
70 
71 }
72 
73 ////////////////////////////////////////////////////////////////////////////////
74 
75 template <typename T>
76 void compareOutputs(const std::vector<T>& inputVector1,
77  const std::vector<T>& inputVector2,
78  std::vector<uint32_t>& outputVector)
79 {
80  assert(inputVector1.size()==inputVector2.size() &&
81  inputVector1.size()==outputVector.size());
82 
83  const uint32_t size = inputVector1.size();
84 
85  for (unsigned int i=0;i<size;++i)
86  outputVector[i]=diffbit(inputVector1[i],inputVector2[i]);
87 }
88 
89 //------------------------------------------------------------------------------
90 
91 enum rangeType {kReal,
92  kExp,
93  kExpf,
94  kRealPlus,
95  km1p1};
96 
97 template <typename T>
98 void fillRandom(std::vector<T>& randomV,
99  const rangeType theRangeType)
100 {
101  // Yeah, well, maybe it can be done better. But this is not a tutorial about
102  // random generation!
103  const uint32_t size=randomV.size();
104  static TRandom3 rndmGenerator(123);
105  T* arr = &(randomV[0]);
106  rndmGenerator.RndmArray(size,arr);
107  if (kReal == theRangeType ) for (uint32_t i=0;i<size;++i) randomV[i]=(randomV[i]-0.5)*2*RANGE;
108  if (kExp == theRangeType ) for (uint32_t i=0;i<size;++i) randomV[i]=(randomV[i]-0.5)*2*705.;
109  if (kExpf == theRangeType ) for (uint32_t i=0;i<size;++i) randomV[i]=(randomV[i]-0.5)*2*85.;
110  if (kRealPlus == theRangeType ) for (uint32_t i=0;i<size;++i) randomV[i]=randomV[i]*RANGE+0.000001;
111  if (km1p1 == theRangeType ) for (uint32_t i=0;i<size;++i) randomV[i]=(randomV[i]-0.5)*2;
112 
113 }
114 
115 //------------------------------------------------------------------------------
116 
117 template<typename T>
118 void treatBinDiffHisto(TH1F& histo,
119  const std::vector<T>& VDTVals,
120  const std::vector<T>& SystemVals)
121 {
122  const uint32_t size = VDTVals.size();
123  std::vector<uint32_t> diff(size);
124  compareOutputs(VDTVals,SystemVals,diff);
125  uint32_t theDiff=0;
126  for (uint32_t i =0;i<size;++i){
127  theDiff=diff[i];
128  histo.Fill(theDiff);
129  }
130 }
131 
132 ////////////////////////////////////////////////////////////////////////////////
133 
134 template <typename T, typename F>
135 inline double measureTiming(F mathFunc,
136  const std::vector<T>& inputVector,
137  std::vector<T>& outputVector)
138 {
139  TStopwatch timer;
140  timer.Start();
141  calculateValues<T>(mathFunc,inputVector,outputVector);
142  timer.Stop();
143  return timer.RealTime();
144 }
145 
146 //------------------------------------------------------------------------------
147 
148  /*
149  Reference values on a Intel(R) Core(TM) i7 CPU 950 @ 3.07GHz
150  gcc 4.8.2 -Ofast
151 
152  Expf 0.110623 0.821863 7.4294 3.35636 6
153  Sinf 0.151893 9.83798 64.7692 0.235055 9
154  Cosf 0.11277 9.87508 87.5683 0.234271 8
155  Tanf 0.167273 9.84792 58.8733 0.519784 9
156  Atanf 0.0855272 0.529288 6.18854 0.366963 2
157  Logf 0.114023 0.465541 4.08287 0.270999 2
158  Isqrtf 0.0328619 0.275043 8.36965 4.35237 7
159  Asinf 0.0958891 0.415733 4.33556 0.60167 3
160  Acosf 0.099067 0.470179 4.74607 0.480427 10
161  Exp 0.204585 0.64904 3.17247 0.137142 2
162  Sin 0.327537 1.5099 4.60986 0.253579 2
163  Cos 0.299601 1.5038 5.01933 0.253664 2
164  Tan 0.276369 2.13009 7.7074 0.351065 5
165  Atan 0.355532 0.902413 2.5382 0.326134 2
166  Log 0.244172 1.25513 5.14034 0.385112 2
167  Isqrt 0.167836 0.283752 1.69065 0.453692 2
168  Asin 0.40379 0.869315 2.15289 0.318644 2
169  Acos 0.392566 0.864706 2.2027 0.391922 11
170  */
171 
172  // The reference values: speedup and accuracy. Some contingency is given
173 struct staticInitHelper{
174  std::map<std::string, std::pair<float,uint32_t> > referenceValues;
175 
176  staticInitHelper()
177  {
178  referenceValues["Expf"] = std::make_pair(1.f,8);
179  referenceValues["Sinf"] = std::make_pair(1.f,11);
180  referenceValues["Cosf"] = std::make_pair(1.f,10);
181  referenceValues["Tanf"] = std::make_pair(1.f,11);
182  referenceValues["Atanf"] = std::make_pair(1.f,4);
183  referenceValues["Logf"] = std::make_pair(1.f,4);
184  referenceValues["Isqrtf"]= std::make_pair(1.f,9);
185  referenceValues["Asinf"] = std::make_pair(1.f,5);
186  referenceValues["Acosf"] = std::make_pair(1.f,12);
187  referenceValues["Exp"] = std::make_pair(1.f,4);
188  referenceValues["Sin"] = std::make_pair(1.f,4);
189  referenceValues["Cos"] = std::make_pair(1.f,4);
190  referenceValues["Tan"] = std::make_pair(1.f,7);
191  referenceValues["Atan"] = std::make_pair(1.f,4);
192  referenceValues["Log"] = std::make_pair(1.f,4);
193  referenceValues["Isqrt"] = std::make_pair(.4f,4); // Fix fluctuation on x86_64-slc5-gcc47
194  referenceValues["Asin"] = std::make_pair(1.f,4);
195  referenceValues["Acos"] = std::make_pair(1.f,13);
196  }
197 } gbl;
198 
199 template <typename T, typename F1, typename F2>
200 inline void compareFunctions(const std::string& label,
201  F1 vdtFunc,
202  F2 systemFunc,
203  const std::vector<T>& inputVector,
204  std::vector<T>& outputVectorVDT,
205  std::vector<T>& outputVectorSystem,
206  float& speedup,
207  uint32_t& maxdiffBit,
208  TH1F& histo)
209 {
210  double timeVdt = measureTiming<T>(vdtFunc,inputVector,outputVectorVDT);
211  double timeSystem = measureTiming<T>(systemFunc,inputVector,outputVectorSystem);
212  std::string name(label);
213  std::string title(label);
214  title+=";Diff. Bit;#";
215  histo.Reset();
216  histo.SetName(label.c_str());
217  histo.SetTitle(title.c_str());
218  treatBinDiffHisto(histo,outputVectorVDT,outputVectorSystem);
219  double meandiffBit = histo.GetMean();
220  maxdiffBit = 0;
221  const uint32_t xmax=histo.GetXaxis()->GetXmax();
222 
223  for (uint32_t i=1;i<=xmax;i++){
224  if ( histo.GetBinContent(i) > 0.f )
225  maxdiffBit=i-1;
226  }
227 
228  speedup = timeSystem/timeVdt ;
229 
230  std::cout << std::setw(8)
231  << label << std::setw(10)
232  << timeVdt << std::setw(10)
233  << timeSystem << std::setw(15)
234  << speedup << std::setw(15)
235  << meandiffBit << std::setw(15)
236  << maxdiffBit << std::endl;
237 
238  // Draw it
239  TCanvas c;
240  c.cd();
241  histo.SetLineColor(kBlue);
242  histo.SetLineWidth(2);
243  histo.Draw("hist");
244  c.SetLogy();
245  name+=".png";
246  Int_t oldErrorIgnoreLevel = gErrorIgnoreLevel; // we know we are printing..
247  gErrorIgnoreLevel=1001;
248  c.Print(name.c_str());
249  gErrorIgnoreLevel=oldErrorIgnoreLevel;
250 }
251 
252 //
253 void checkFunction(const std::string& label,float /*speedup*/, uint32_t maxdiffBit)
254 {
255 // Remove check on the speed as routinely this program is ran on virtual build nodes
256 // and several factors may cause fluctuations in the result.
257 // if (gbl.referenceValues[label].first > speedup)
258 // std::cerr << "Note " << label << " was slower than the system library.\n";
259  if (gbl.referenceValues[label].second < maxdiffBit)
260  std::cerr << "WARNING " << label << " is too inaccurate!\n";
261 }
262 
263 //------------------------------------------------------------------------------
264 // Some helpers
265 inline float isqrtf(float x) {return 1.f/sqrt(x);};
266 inline double isqrt(double x) {return 1./sqrt(x);};
267 
268 //------------------------------------------------------------------------------
269 // Artificially chunck the work to help the compiler manage everything.
270 // If all the content is moved to a single function, the vectorization breaks.
271 // Same holds for the check of speed and accuracy. Technically it could be part
272 // of compareFunctions.
273 void spStep1()
274 {
275  std::vector<float> VDTVals(SIZE);
276  std::vector<float> SystemVals(SIZE);
277  std::vector<float> realNumbers(SIZE);
278  TH1F histo("bitDiffHisto","willbechanged",32,0,32);
279 
280  float speedup;
281  uint32_t maxdiffBit;
282 
283  fillRandom(realNumbers,kExpf);
284  compareFunctions<float>("Expf", vdt::fast_expf, expf, realNumbers, VDTVals, SystemVals, speedup, maxdiffBit, histo);
285  checkFunction("Expf",speedup, maxdiffBit);
286 
287  fillRandom(realNumbers,kReal);
288  compareFunctions<float>("Sinf", vdt::fast_sinf, sinf, realNumbers, VDTVals, SystemVals, speedup, maxdiffBit, histo);
289  checkFunction("Sinf",speedup, maxdiffBit);
290  compareFunctions<float>("Cosf", vdt::fast_cosf, cosf, realNumbers, VDTVals, SystemVals, speedup, maxdiffBit, histo);
291  checkFunction("Cosf",speedup, maxdiffBit);
292  compareFunctions<float>("Tanf", vdt::fast_tanf, tanf, realNumbers, VDTVals, SystemVals, speedup, maxdiffBit, histo);
293  checkFunction("Tanf",speedup, maxdiffBit);
294  compareFunctions<float>("Atanf", vdt::fast_atanf, atanf, realNumbers, VDTVals, SystemVals, speedup, maxdiffBit, histo);
295  checkFunction("Atanf",speedup, maxdiffBit);
296 }
297 
298 void spStep2()
299 {
300  std::vector<float> VDTVals(SIZE);
301  std::vector<float> SystemVals(SIZE);
302  std::vector<float> realNumbers(SIZE);
303  TH1F histo("bitDiffHisto","willbechanged",32,0,32);
304 
305  float speedup;
306  uint32_t maxdiffBit;
307 
308  fillRandom(realNumbers,kRealPlus);
309  compareFunctions<float>("Logf", vdt::fast_logf, logf, realNumbers, VDTVals, SystemVals, speedup, maxdiffBit, histo);
310  checkFunction("Logf",speedup, maxdiffBit);
311  compareFunctions<float>("Isqrtf", vdt::fast_isqrtf, isqrtf, realNumbers, VDTVals, SystemVals, speedup, maxdiffBit, histo);
312  checkFunction("Isqrtf",speedup, maxdiffBit);
313 }
314 
315 void spStep3()
316 {
317  std::vector<float> VDTVals(SIZE);
318  std::vector<float> SystemVals(SIZE);
319  std::vector<float> realNumbers(SIZE);
320  TH1F histo("bitDiffHisto","willbechanged",32,0,32);
321 
322  float speedup;
323  uint32_t maxdiffBit;
324 
325  fillRandom(realNumbers,km1p1);
326  compareFunctions<float>("Asinf", vdt::fast_asinf, asinf, realNumbers, VDTVals, SystemVals, speedup, maxdiffBit, histo);
327  checkFunction("Asinf",speedup, maxdiffBit);
328  compareFunctions<float>("Acosf", vdt::fast_acosf, acosf, realNumbers, VDTVals, SystemVals, speedup, maxdiffBit, histo);
329  checkFunction("Acosf",speedup, maxdiffBit);
330 }
331 
332 void dpStep1()
333 {
334  std::vector<double> VDTVals(SIZE);
335  std::vector<double> SystemVals(SIZE);
336  std::vector<double> realNumbers(SIZE);
337  TH1F histo("bitDiffHisto","willbechanged",64,0,64);
338 
339  float speedup;
340  uint32_t maxdiffBit;
341 
342  fillRandom(realNumbers,kExp);
343  compareFunctions<double>("Exp", vdt::fast_exp, exp, realNumbers, VDTVals, SystemVals, speedup, maxdiffBit, histo);
344  checkFunction("Exp",speedup, maxdiffBit);
345  fillRandom(realNumbers,kReal);
346  compareFunctions<double>("Sin", vdt::fast_sin, sin, realNumbers, VDTVals, SystemVals, speedup, maxdiffBit, histo);
347  checkFunction("Sin",speedup, maxdiffBit);
348  compareFunctions<double>("Cos", vdt::fast_cos, cos, realNumbers, VDTVals, SystemVals, speedup, maxdiffBit, histo);
349  checkFunction("Cos",speedup, maxdiffBit);
350  compareFunctions<double>("Tan", vdt::fast_tan, tan, realNumbers, VDTVals, SystemVals, speedup, maxdiffBit, histo);
351  checkFunction("Tan",speedup, maxdiffBit);
352  compareFunctions<double>("Atan", vdt::fast_atan, atan, realNumbers, VDTVals, SystemVals, speedup, maxdiffBit, histo);
353  checkFunction("Atan",speedup, maxdiffBit);
354 }
355 
356 void dpStep2()
357 {
358  std::vector<double> VDTVals(SIZE);
359  std::vector<double> SystemVals(SIZE);
360  std::vector<double> realNumbers(SIZE);
361  TH1F histo("bitDiffHisto","willbechanged",64,0,64);
362 
363  float speedup;
364  uint32_t maxdiffBit;
365 
366  fillRandom(realNumbers,kRealPlus);
367  compareFunctions<double>("Log", vdt::fast_log, log, realNumbers, VDTVals, SystemVals, speedup, maxdiffBit, histo);
368  checkFunction("Log",speedup, maxdiffBit);
369  compareFunctions<double>("Isqrt", vdt::fast_isqrt, isqrt, realNumbers, VDTVals, SystemVals, speedup, maxdiffBit, histo);
370  checkFunction("Isqrt",speedup, maxdiffBit);
371 }
372 
373 void dpStep3()
374 {
375  std::vector<double> VDTVals(SIZE);
376  std::vector<double> SystemVals(SIZE);
377  std::vector<double> realNumbers(SIZE);
378  TH1F histo("bitDiffHisto","willbechanged",64,0,64);
379 
380  float speedup;
381  uint32_t maxdiffBit;
382 
383  fillRandom(realNumbers,km1p1);
384  compareFunctions<double>("Asin", vdt::fast_asin, asin, realNumbers, VDTVals, SystemVals, speedup, maxdiffBit, histo);
385  checkFunction("Asin",speedup, maxdiffBit);
386  compareFunctions<double>("Acos", vdt::fast_acos, acos, realNumbers, VDTVals, SystemVals, speedup, maxdiffBit, histo);
387  checkFunction("Acos",speedup, maxdiffBit);
388 }
389 //------------------------------------------------------------------------------
390 
391 int main(){
392 
393  std::cout << "Test performed on " << SIZE << " random numbers\n"
394  << std::setw(8)
395  << "Name" << std::setw(10)
396  << "VDT (s)" << std::setw(10)
397  << "Sys (s)" << std::setw(15)
398  << "Speedup" << std::setw(15)
399  << "<diff Bit>" << std::setw(15)
400  << "max(diff Bit)" << std::endl;
401 
402  // Single precision ----
403  spStep1();
404  spStep2();
405  spStep3();
406 
407  // Double precision ----
408  dpStep1();
409  dpStep2();
410  dpStep3();
411 
412  return 0;
413 
414 }
415 
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spStep3
void spStep3()
Definition: stressVdt.cxx:315
TAttLine::SetLineWidth
virtual void SetLineWidth(Width_t lwidth)
Definition: TAttLine.h:57
TH1::Fill
virtual Int_t Fill(Double_t x)
Increment bin with abscissa X by 1.
Definition: TH1.cxx:3159
vdt::fast_expf
float fast_expf(float initial_x)
Exponential Function single precision.
Definition: exp.h:118
vdt::fast_asinf
float fast_asinf(float x)
Single Precision asin.
Definition: asin.h:157
vdt::fast_tanf
float fast_tanf(float x)
Definition: tan.h:130
TRandom3
Random number generator class based on M.
Definition: TRandom3.h:29
TStopwatch::RealTime
Double_t RealTime()
Stop the stopwatch (if it is running) and return the realtime (in seconds) passed between the start a...
Definition: TStopwatch.cxx:108
TH1::GetBinContent
virtual Double_t GetBinContent(Int_t bin) const
Return content of bin number bin.
Definition: TH1.cxx:4629
vdt::fast_sinf
float fast_sinf(float x)
Definition: sin.h:41
TStopwatch::Start
void Start(Bool_t reset=kTRUE)
Start the stopwatch.
Definition: TStopwatch.cxx:56
gErrorIgnoreLevel
R__EXTERN Int_t gErrorIgnoreLevel
Definition: TError.h:107
vdt::fast_exp
double fast_exp(double initial_x)
Exponential Function double precision.
Definition: exp.h:70
c
return c
Definition: entrylist_figure1.C:47
assert
#define assert(cond)
Definition: unittest.h:542
TCanvas::cd
TVirtualPad * cd(Int_t subpadnumber=0)
Set current canvas & pad.
Definition: TCanvas.cxx:659
vdt::details::sp2uint32
uint32_t sp2uint32(float x)
Converts a float to an int.
Definition: vdtcore_common.h:123
histo
TH1 * histo
Definition: minuit2FitBench.C:28
RANGE
const double RANGE
Simple program to benchmark vdt accuracy and cpu performance.
Definition: stressVdt.cxx:20
TH1F
1-D histogram with a float per channel (see TH1 documentation)}
Definition: TH1.h:570
measureTiming
double measureTiming(F mathFunc, const std::vector< T > &inputVector, std::vector< T > &outputVector)
Definition: stressVdt.cxx:135
gbl
struct staticInitHelper gbl
Int_t
int Int_t
Definition: RtypesCore.h:41
a
TArc * a
Definition: textangle.C:12
vdt::fast_asin
double fast_asin(double x)
Double Precision asin.
Definition: asin.h:120
TPad::Print
virtual void Print(const char *filename="") const
Save Pad contents in a file in one of various formats.
Definition: TPad.cxx:4134
diffbit
uint32_t diffbit(const T a, const T b)
Returns most significative different bit.
Definition: stressVdt.cxx:47
isqrtf
float isqrtf(float x)
Definition: stressVdt.cxx:265
cos
double cos(double)
f
TFile * f
Definition: memstatExample.C:52
treatBinDiffHisto
void treatBinDiffHisto(TH1F &histo, const std::vector< T > &VDTVals, const std::vector< T > &SystemVals)
Definition: stressVdt.cxx:118
TH1F::Reset
virtual void Reset(Option_t *option="")
Reset.
Definition: TH1.cxx:9501
SIZE
const uint32_t SIZE
Definition: stressVdt.cxx:21
T
TTree * T
Definition: memstatExample.C:53
sqrt
double sqrt(double)
vdt::fast_acos
double fast_acos(double x)
Definition: asin.h:208
timer
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Definition: pirndm.C:37
TStopwatch::Stop
void Stop()
Stop the stopwatch.
Definition: TStopwatch.cxx:75
x
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Definition: legend1.C:17
acos
double acos(double)
dpStep2
void dpStep2()
Definition: stressVdt.cxx:356
vdt::fast_atan
double fast_atan(double x)
Fast Atan implementation double precision.
Definition: atan.h:86
vdt::fast_cos
double fast_cos(double x)
Double precision cosine: just call sincos.
Definition: cos.h:22
compareFunctions
void compareFunctions(const std::string &label, F1 vdtFunc, F2 systemFunc, const std::vector< T > &inputVector, std::vector< T > &outputVectorVDT, std::vector< T > &outputVectorSystem, float &speedup, uint32_t &maxdiffBit, TH1F &histo)
Definition: stressVdt.cxx:200
F1
#define F1(x, y, z)
Definition: TMD5.cxx:266
dpStep3
void dpStep3()
Definition: stressVdt.cxx:373
sin
double sin(double)
checkFunction
void checkFunction(const std::string &label, float, uint32_t maxdiffBit)
Definition: stressVdt.cxx:253
fp2uint< double >
uint64_t fp2uint< double >(double x)
Definition: stressVdt.cxx:33
vdt::fast_log
double fast_log(double x)
Definition: log.h:89
TAttLine::SetLineColor
virtual void SetLineColor(Color_t lcolor)
Definition: TAttLine.h:54
F
#define F(x, y, z)
TH1::GetMean
virtual Double_t GetMean(Int_t axis=1) const
For axis = 1,2 or 3 returns the mean value of the histogram along X,Y or Z axis.
Definition: TH1.cxx:7014
spStep2
void spStep2()
Definition: stressVdt.cxx:298
vdt::fast_sin
double fast_sin(double x)
Double precision sine: just call sincos.
Definition: sin.h:37
TH1::Draw
virtual void Draw(Option_t *option="")
Draw this histogram with options.
Definition: TH1.cxx:2878
title
TPaveLabel title(3, 27.1, 15, 28.7,"ROOT Environment and Tools")
vdt::fast_isqrtf
float fast_isqrtf(float x)
Two iterations.
Definition: sqrt.h:85
vdt::details::dp2uint64
uint64_t dp2uint64(double x)
Converts a double to an unsigned long long.
Definition: vdtcore_common.h:85
F2
#define F2(x, y, z)
Definition: TMD5.cxx:267
spStep1
void spStep1()
Definition: stressVdt.cxx:273
xmax
float xmax
Definition: THbookFile.cxx:93
asin
double asin(double)
dpStep1
void dpStep1()
Definition: stressVdt.cxx:332
TRandom3::RndmArray
virtual void RndmArray(Int_t n, Float_t *array)
Return an array of n random numbers uniformly distributed in ]0,1].
Definition: TRandom3.cxx:138
TH1::SetName
virtual void SetName(const char *name)
Change the name of this histogram.
Definition: TH1.cxx:8288
TCanvas
The Canvas class.
Definition: TCanvas.h:48
fillRandom
void fillRandom(std::vector< T > &randomV, const rangeType theRangeType)
Definition: stressVdt.cxx:98
rangeType
rangeType
Definition: stressVdt.cxx:91
fp2uint
uint64_t fp2uint(T)
Definition: stressVdt.cxx:26
isqrt
double isqrt(double x)
Definition: stressVdt.cxx:266
fp2uint< float >
uint64_t fp2uint< float >(float x)
Definition: stressVdt.cxx:39
TAxis::GetXmax
Double_t GetXmax() const
Definition: TAxis.h:138
atan
double atan(double)
main
int main()
Definition: stressVdt.cxx:391
name
#define name(a, b)
Definition: linkTestLib0.cpp:5
tan
double tan(double)
vdt::fast_logf
float fast_logf(float x)
Definition: log.h:172
kBlue
Definition: Rtypes.h:61
TH1::SetTitle
virtual void SetTitle(const char *title)
Change (i.e.
Definition: TH1.cxx:6268
vdt::fast_cosf
float fast_cosf(float x)
Definition: cos.h:26
compareOutputs
void compareOutputs(const std::vector< T > &inputVector1, const std::vector< T > &inputVector2, std::vector< uint32_t > &outputVector)
Definition: stressVdt.cxx:76
exp
double exp(double)
vdt::fast_tan
double fast_tan(double x)
Double precision tangent implementation.
Definition: tan.h:84
calculateValues
void calculateValues(F mathFunc, const std::vector< T > &inputVector, std::vector< T > &outputVector)
Definition: stressVdt.cxx:60
log
double log(double)
TH1::GetXaxis
TAxis * GetXaxis()
Definition: TH1.h:319
vdt::fast_atanf
float fast_atanf(float xx)
Fast Atan implementation single precision.
Definition: atan.h:129
vdt::fast_isqrt
double fast_isqrt(double x)
Four iterations.
Definition: sqrt.h:55
vdt::fast_acosf
float fast_acosf(float x)
Definition: asin.h:212
TStopwatch
Stopwatch class.
Definition: TStopwatch.h:30
TPad::SetLogy
virtual void SetLogy(Int_t value=1)
Set Lin/Log scale for Y.
Definition: TPad.cxx:5314