forked from OSchip/llvm-project
67 lines
2.1 KiB
C
67 lines
2.1 KiB
C
// 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;
|
|
}
|