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// RUN: %clang_builtins %s %librt -o %t && %run %t
//===-- compiler_rt_logbl_test.c - Test __compiler_rt_logbl ---------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file checks __compiler_rt_logbl from the compiler_rt library for
// conformance against libm.
//
//===----------------------------------------------------------------------===//
#define QUAD_PRECISION
#include <math.h>
#include <stdio.h>
#include "fp_lib.h"
#include "int_lib.h"
#if defined(CRT_HAS_128BIT) && defined(CRT_LDBL_128BIT)
int test__compiler_rt_logbl(fp_t x) {
fp_t crt_value = __compiler_rt_logbl(x);
fp_t libm_value = logbl(x);
// Compare actual rep, e.g. to avoid NaN != the same NaN
if (toRep(crt_value) != toRep(libm_value)) {
// Split expected values into two for printf
twords x_t, crt_value_t, libm_value_t;
x_t.all = toRep(x);
crt_value_t.all = toRep(crt_value);
libm_value_t.all = toRep(libm_value);
printf(
"error: in __compiler_rt_logb(%a [%llX %llX]) = %a [%llX %llX] != %a "
"[%llX %llX]\n",
x, x_t.s.high, x_t.s.low, crt_value, crt_value_t.s.high,
crt_value_t.s.low, libm_value, libm_value_t.s.high, libm_value_t.s.low);
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,
};
#endif
int main() {
#if defined(CRT_HAS_128BIT) && defined(CRT_LDBL_128BIT)
const unsigned N = sizeof(cases) / sizeof(cases[0]);
unsigned i;
for (i = 0; i < N; ++i) {
if (test__compiler_rt_logbl(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_logbl(fromRep(x))) return 1;
if (test__compiler_rt_logbl(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_logbl(fromRep(x))) return 1;
if (test__compiler_rt_logbl(fromRep(signBit ^ x))) return 1;
x >>= 1;
}
#else
printf("skipped\n");
#endif
return 0;
}
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