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// RUN: %clang_builtins %s %librt -o %t && %run %t
//===-- compiler_rt_logbf_test.c - Test __compiler_rt_logbf ---------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file checks __compiler_rt_logbf from the compiler_rt library for
// conformance against libm.
//
//===----------------------------------------------------------------------===//
#define SINGLE_PRECISION
#include "fp_lib.h"
#include "int_math.h"
#include <math.h>
#include <stdio.h>
int test__compiler_rt_logbf(fp_t x) {
fp_t crt_value = __compiler_rt_logbf(x);
fp_t libm_value = logbf(x);
// `!=` operator on fp_t returns false for NaNs so also check if operands are
// both NaN. We don't do `toRepr(crt_value) != toRepr(libm_value)` because
// that treats different representations of NaN as not equivalent.
if (crt_value != libm_value &&
!(crt_isnan(crt_value) && crt_isnan(libm_value))) {
printf("error: in __compiler_rt_logb(%a [%X]) = %a [%X] != %a [%X]\n", x,
toRep(x), crt_value, toRep(crt_value), libm_value,
toRep(libm_value));
return 1;
}
return 0;
}
double cases[] = {
1.e-6, -1.e-6, NAN, -NAN, INFINITY, -INFINITY, -1,
-0.0, 0.0, 1, -2, 2, -0.5, 0.5,
};
int main() {
const unsigned N = sizeof(cases) / sizeof(cases[0]);
unsigned i;
for (i = 0; i < N; ++i) {
if (test__compiler_rt_logbf(cases[i])) return 1;
}
// Test a moving 1 bit, especially to handle denormal values.
// Test the negation as well.
rep_t x = signBit;
while (x) {
if (test__compiler_rt_logbf(fromRep(x))) return 1;
if (test__compiler_rt_logbf(fromRep(signBit ^ x))) return 1;
x >>= 1;
}
// Also try a couple moving ones
x = signBit | (signBit >> 1) | (signBit >> 2);
while (x) {
if (test__compiler_rt_logbf(fromRep(x))) return 1;
if (test__compiler_rt_logbf(fromRep(signBit ^ x))) return 1;
x >>= 1;
}
return 0;
}
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