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47 lines
884 B
C++
47 lines
884 B
C++
/* -*-c++-*- */
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#include <stdio.h>
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#include <stdlib.h>
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#include "llvm/Support/MathExtras.h"
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inline void
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testPow(int C, bool isPow)
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{
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unsigned pow = 0;
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bool testIsPow = IsPowerOf2(C, pow);
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if (isPow != testIsPow)
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printf("ERROR: IsPowerOf2() says \t%d %s a power of 2 = %d\n",
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C, (isPow? "IS" : "IS NOT"), pow);
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#undef PRINT_CORRECT_RESULTS
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#ifdef PRINT_CORRECT_RESULTS
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else
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printf("CORRECT: IsPowerOf2() says \t%d %s a power of 2 = %d\n",
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C, (isPow? "IS" : "IS NOT"), pow);
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#endif PRINT_CORRECT_RESULTS
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}
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int
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main(int argc, char** argv)
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{
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unsigned L = (argc > 1)? atoi(argv[1]) : 16;
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unsigned C = 1;
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testPow(0, false);
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for (unsigned i = 1; i < L; i++, C = C << 1)
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{
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testPow(C, true);
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testPow(-C, true);
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for (unsigned j = C+1; j < (C << 1); j++)
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{
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testPow(j, false);
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testPow(-j, false);
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}
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}
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return 0;
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}
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