forked from OSchip/llvm-project
79 lines
2.4 KiB
C
79 lines
2.4 KiB
C
// RUN: %clang_builtins %s %librt -o %t && %run %t
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#define DOUBLE_PRECISION
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#include <fenv.h>
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#include <float.h>
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#include <limits.h>
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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_scalbn(const char *mode, fp_t x, int y) {
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fp_t crt_value = __compiler_rt_scalbn(x, y);
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fp_t libm_value = scalbn(x, y);
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// Consider +/-0 unequal, but disregard the sign/payload of NaN.
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if (toRep(crt_value) != toRep(libm_value) &&
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!(crt_isnan(crt_value) && crt_isnan(libm_value))) {
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printf("error: [%s] in __compiler_rt_scalbn(%a [%llX], %d) = %a [%llX] "
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"!= %a [%llX]\n",
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mode, x, (unsigned long long)toRep(x), y,
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crt_value, (unsigned long long)toRep(crt_value),
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libm_value, (unsigned long long)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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fp_t cases[] = {
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-NAN, NAN, -INFINITY, INFINITY, -0.0, 0.0, -1, 1, -2, 2,
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DBL_TRUE_MIN, DBL_TRUE_MIN*7, DBL_MIN, DBL_MAX,
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-1.001, 1.001, -1.002, 1.002, 1.e-6, -1.e-6,
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0x1.0p-1021,
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0x1.0p-1022,
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0x1.0p-1023, // subnormal
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0x1.0p-1024, // subnormal
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};
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int iterate_cases(const char *mode) {
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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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int j;
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for (j = -5; j <= 5; ++j) {
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if (test__compiler_rt_scalbn(mode, cases[i], j)) return 1;
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}
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if (test__compiler_rt_scalbn(mode, cases[i], -10000)) return 1;
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if (test__compiler_rt_scalbn(mode, cases[i], 10000)) return 1;
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if (test__compiler_rt_scalbn(mode, cases[i], INT_MIN)) return 1;
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if (test__compiler_rt_scalbn(mode, cases[i], INT_MAX)) return 1;
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}
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return 0;
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}
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int main() {
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if (iterate_cases("default")) return 1;
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// Rounding mode tests on supported architectures. __compiler_rt_scalbn
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// should have the same rounding behavior as double-precision multiplication.
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#if (defined(__arm__) || defined(__aarch64__)) && defined(__ARM_FP) || \
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defined(__i386__) || defined(__x86_64__)
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// Skip these tests for MSVC because its scalbn function always behaves as if
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// the default rounding mode is set (FE_TONEAREST).
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#ifndef _MSC_VER
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fesetround(FE_UPWARD);
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if (iterate_cases("FE_UPWARD")) return 1;
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fesetround(FE_DOWNWARD);
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if (iterate_cases("FE_DOWNWARD")) return 1;
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fesetround(FE_TOWARDZERO);
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if (iterate_cases("FE_TOWARDZERO")) return 1;
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#endif
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fesetround(FE_TONEAREST);
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if (iterate_cases("FE_TONEAREST")) return 1;
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#endif
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return 0;
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}
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