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1// RUN: %clang_builtins %s %librt -o %t && %run %t2 3#define SINGLE_PRECISION4#include "fp_lib.h"5#include "int_math.h"6#include <math.h>7#include <stdio.h>8 9int test__compiler_rt_logbf(fp_t x) {10#if defined(__ve__)11 if (fpclassify(x) == FP_SUBNORMAL)12 return 0;13#endif14 fp_t crt_value = __compiler_rt_logbf(x);15 fp_t libm_value = logbf(x);16 // `!=` operator on fp_t returns false for NaNs so also check if operands are17 // both NaN. We don't do `toRepr(crt_value) != toRepr(libm_value)` because18 // that treats different representations of NaN as not equivalent.19 if (crt_value != libm_value &&20 !(crt_isnan(crt_value) && crt_isnan(libm_value))) {21 printf("error: in __compiler_rt_logb(%a [%X]) = %a [%X] != %a [%X]\n", x,22 toRep(x), crt_value, toRep(crt_value), libm_value,23 toRep(libm_value));24 return 1;25 }26 return 0;27}28 29double cases[] = {30 1.e-6, -1.e-6, NAN, -NAN, INFINITY, -INFINITY, -1,31 -0.0, 0.0, 1, -2, 2, -0.5, 0.5,32};33 34int main() {35 const unsigned N = sizeof(cases) / sizeof(cases[0]);36 unsigned i;37 for (i = 0; i < N; ++i) {38 if (test__compiler_rt_logbf(cases[i])) return 1;39 }40 41 // Test a moving 1 bit, especially to handle denormal values.42 // Test the negation as well.43 rep_t x = signBit;44 while (x) {45 if (test__compiler_rt_logbf(fromRep(x))) return 1;46 if (test__compiler_rt_logbf(fromRep(signBit ^ x))) return 1;47 x >>= 1;48 }49 // Also try a couple moving ones50 x = signBit | (signBit >> 1) | (signBit >> 2);51 while (x) {52 if (test__compiler_rt_logbf(fromRep(x))) return 1;53 if (test__compiler_rt_logbf(fromRep(signBit ^ x))) return 1;54 x >>= 1;55 }56 57 return 0;58}59