| // 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 <math.h> |
| #include <stdio.h> |
| #include "fp_lib.h" |
| |
| int test__compiler_rt_logbf(fp_t x) { |
| fp_t crt_value = __compiler_rt_logbf(x); |
| fp_t libm_value = logbf(x); |
| // Compare actual rep, e.g. to avoid NaN != the same NaN |
| if (toRep(crt_value) != toRep(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; |
| } |