added cvtFastPerfotm test

2009-07-23 17:25:51 +00:00
parent 1ba6da438b
commit 7315f02888
2 changed files with 136 additions and 0 deletions
@@ -0,0 +1,133 @@
+
+// Author: Jeff Hill, LANL
+
+#include <cmath>
+#include <cfloat>
+#include <cstdlib>
+#include <typeinfo>
+
+#include "epicsStdio.h"
+#include "cvtFast.h"
+#include "epicsTime.h"
+
+
+typedef void ( * PTestFunc ) ( const double &, char * pBug, size_t bufSize );
+
+class Test {
+public:
+    Test ();
+    void execute ();
+protected:
+    char _pDst[128];
+    double _srcVal;
+    unsigned short _prec;
+    static unsigned const _nUnrolled = 10;
+    static const unsigned _uSecPerSec = 1000000;
+    static unsigned const _nIterations = 10000;
+    virtual void _target () = 0;
+    void _measure ();
+    Test ( const Test & );
+    Test & operator = ( Test & );
+};
+
+class TestCvtFastDouble : public Test {
+protected:
+    void _target ();
+};
+
+class TestSNPrintf : public Test {
+protected:
+    void _target ();
+};
+
+Test ::
+    Test () :
+    _srcVal ( 0.0 ), _prec ( 0 )
+{
+}
+
+void Test :: execute ()
+{
+    static const unsigned lowPrecision = 2;
+    static const unsigned highPrecision = DBL_MANT_DIG;
+    
+    for ( unsigned i = 0; i < 10; i++ ) {
+        double mVal = rand ();
+        mVal /= (RAND_MAX + 1);
+        double fEVal = rand ();
+        fEVal /= (RAND_MAX + 1);
+        fEVal *= DBL_MAX_EXP - DBL_MIN_EXP;
+        fEVal += DBL_MIN_EXP;
+        int eVal = static_cast < int > ( fEVal + 0.5 );
+        _srcVal = ldexp ( mVal, eVal );
+        for ( _prec = lowPrecision; 
+                        _prec <= highPrecision; _prec += 4u ) {
+            _measure ();
+        }
+    }
+}
+
+void Test :: _measure ()
+{
+    epicsTime beg = epicsTime :: getCurrent ();
+    for ( unsigned i = 0; i < _nIterations; i++ ) {
+        _target ();
+    }
+    epicsTime end = epicsTime :: getCurrent ();
+    double elapsed = end - beg;
+    elapsed /= _nIterations * _nUnrolled;
+    elapsed *= _uSecPerSec;
+    printf ( " %4.4f usec, prec=%i, val=%4.4g, for %s\n",
+            elapsed, _prec, _srcVal, typeid ( *this ).name () );
+}
+    
+void TestCvtFastDouble :: _target ()
+{
+    cvtDoubleToString ( _srcVal, _pDst, _prec );
+    cvtDoubleToString ( _srcVal, _pDst, _prec );
+    cvtDoubleToString ( _srcVal, _pDst, _prec );
+    cvtDoubleToString ( _srcVal, _pDst, _prec );
+    cvtDoubleToString ( _srcVal, _pDst, _prec );
+
+    cvtDoubleToString ( _srcVal, _pDst, _prec );
+    cvtDoubleToString ( _srcVal, _pDst, _prec );
+    cvtDoubleToString ( _srcVal, _pDst, _prec );
+    cvtDoubleToString ( _srcVal, _pDst, _prec );
+    cvtDoubleToString ( _srcVal, _pDst, _prec );
+}
+
+void TestSNPrintf :: _target ()
+{
+    epicsSnprintf ( _pDst, sizeof ( _pDst ), "%.*g", 
+                static_cast < int > ( _prec ), _srcVal );
+    epicsSnprintf ( _pDst, sizeof ( _pDst ), "%.*g", 
+                static_cast < int > ( _prec ), _srcVal );
+    epicsSnprintf ( _pDst, sizeof ( _pDst ), "%.*g", 
+                static_cast < int > ( _prec ), _srcVal );
+    epicsSnprintf ( _pDst, sizeof ( _pDst ), "%.*g", 
+                static_cast < int > ( _prec ), _srcVal );
+    epicsSnprintf ( _pDst, sizeof ( _pDst ), "%.*g", 
+                static_cast < int > ( _prec ), _srcVal );
+                
+    epicsSnprintf ( _pDst, sizeof ( _pDst ), "%.*g", 
+                static_cast < int > ( _prec ), _srcVal );
+    epicsSnprintf ( _pDst, sizeof ( _pDst ), "%.*g", 
+                static_cast < int > ( _prec ), _srcVal );
+    epicsSnprintf ( _pDst, sizeof ( _pDst ), "%.*g", 
+                static_cast < int > ( _prec ), _srcVal );
+    epicsSnprintf ( _pDst, sizeof ( _pDst ), "%.*g", 
+                static_cast < int > ( _prec ), _srcVal );
+    epicsSnprintf ( _pDst, sizeof ( _pDst ), "%.*g", 
+                static_cast < int > ( _prec ), _srcVal );
+}
+
+int main ()
+{
+    TestCvtFastDouble testCvtFastDouble;
+    TestSNPrintf testSNPrintf;
+    
+    testCvtFastDouble.execute ();
+    testSNPrintf.execute ();
+
+    return 0;
+}