forked from OSchip/llvm-project
63 lines
1.9 KiB
C
63 lines
1.9 KiB
C
// RUN: %clang_builtins %s %librt -o %t && %run %t
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//===-- compiler_rt_logbf_test.c - Test __compiler_rt_logbf ---------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file checks __compiler_rt_logbf from the compiler_rt library for
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// conformance against libm.
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//
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//===----------------------------------------------------------------------===//
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#define SINGLE_PRECISION
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#include <math.h>
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#include <stdio.h>
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#include "fp_lib.h"
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int test__compiler_rt_logbf(fp_t x) {
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fp_t crt_value = __compiler_rt_logbf(x);
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fp_t libm_value = logbf(x);
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// Compare actual rep, e.g. to avoid NaN != the same NaN
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if (toRep(crt_value) != toRep(libm_value)) {
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printf("error: in __compiler_rt_logb(%a [%X]) = %a [%X] != %a [%X]\n", x,
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toRep(x), crt_value, toRep(crt_value), libm_value,
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toRep(libm_value));
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return 1;
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}
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return 0;
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}
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double cases[] = {
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1.e-6, -1.e-6, NAN, -NAN, INFINITY, -INFINITY, -1,
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-0.0, 0.0, 1, -2, 2, -0.5, 0.5,
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};
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int main() {
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const unsigned N = sizeof(cases) / sizeof(cases[0]);
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unsigned i;
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for (i = 0; i < N; ++i) {
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if (test__compiler_rt_logbf(cases[i])) return 1;
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}
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// Test a moving 1 bit, especially to handle denormal values.
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// Test the negation as well.
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rep_t x = signBit;
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while (x) {
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if (test__compiler_rt_logbf(fromRep(x))) return 1;
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if (test__compiler_rt_logbf(fromRep(signBit ^ x))) return 1;
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x >>= 1;
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}
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// Also try a couple moving ones
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x = signBit | (signBit >> 1) | (signBit >> 2);
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while (x) {
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if (test__compiler_rt_logbf(fromRep(x))) return 1;
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if (test__compiler_rt_logbf(fromRep(signBit ^ x))) return 1;
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x >>= 1;
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}
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return 0;
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}
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