1// RUN: %clang_builtins %s %librt -o %t && %run %t
2
3#define SINGLE_PRECISION
4#include <fenv.h>
5#include <float.h>
6#include <limits.h>
7#include <math.h>
8#include <stdio.h>
9#include "fp_lib.h"
10
11int test__compiler_rt_scalbnf(const char *mode, fp_t x, int y) {
12#if defined(__ve__)
13 if (fpclassify(x) == FP_SUBNORMAL)
14 return 0;
15#endif
16 fp_t crt_value = __compiler_rt_scalbnf(x, y);
17 fp_t libm_value = scalbnf(x: x, n: y);
18 // Consider +/-0 unequal, but disregard the sign/payload of NaN.
19 if (toRep(x: crt_value) != toRep(x: libm_value) &&
20 !(crt_isnan(crt_value) && crt_isnan(libm_value))) {
21 printf(format: "error: [%s] in __compiler_rt_scalbnf(%a [%X], %d) = %a [%X] "
22 "!= %a [%X]\n",
23 mode, x, toRep(x), y, crt_value, toRep(x: crt_value),
24 libm_value, toRep(x: libm_value));
25 return 1;
26 }
27 return 0;
28}
29
30fp_t cases[] = {
31 -NAN, NAN, -INFINITY, INFINITY, -0.0, 0.0, -1, 1, -2, 2,
32 FLT_TRUE_MIN, FLT_TRUE_MIN*7, FLT_MIN, FLT_MAX,
33 -1.001, 1.001, -1.002, 1.002, 1.e-6, -1.e-6,
34 0x1.0p-125,
35 0x1.0p-126,
36 0x1.0p-127, // subnormal
37 0x1.0p-128, // subnormal
38};
39
40int iterate_cases(const char *mode) {
41 const unsigned N = sizeof(cases) / sizeof(cases[0]);
42 unsigned i;
43 for (i = 0; i < N; ++i) {
44 int j;
45 for (j = -5; j <= 5; ++j) {
46 if (test__compiler_rt_scalbnf(mode, x: cases[i], y: j)) return 1;
47 }
48 if (test__compiler_rt_scalbnf(mode, x: cases[i], y: -1000)) return 1;
49 if (test__compiler_rt_scalbnf(mode, x: cases[i], y: 1000)) return 1;
50 if (test__compiler_rt_scalbnf(mode, x: cases[i], INT_MIN)) return 1;
51 if (test__compiler_rt_scalbnf(mode, x: cases[i], INT_MAX)) return 1;
52 }
53 return 0;
54}
55
56int main() {
57 if (iterate_cases(mode: "default")) return 1;
58
59 // Rounding mode tests on supported architectures. __compiler_rt_scalbnf
60 // should have the same rounding behavior as single-precision multiplication.
61#if (defined(__arm__) || defined(__aarch64__)) && defined(__ARM_FP) || \
62 defined(__i386__) || defined(__x86_64__)
63// Skip these tests on Windows because the UCRT scalbnf function always behaves
64// as if the default rounding mode is set (FE_TONEAREST).
65// Also skip for newlib because although its scalbnf function does respect the
66// rounding mode, where the tests trigger an underflow or overflow using a
67// large exponent the result is rounded in the opposite direction to that which
68// would be expected in the (FE_UPWARD) and (FE_DOWNWARD) modes.
69# if !defined(_WIN32) && !defined(_NEWLIB_VERSION)
70 fesetround(FE_UPWARD);
71 if (iterate_cases(mode: "FE_UPWARD")) return 1;
72
73 fesetround(FE_DOWNWARD);
74 if (iterate_cases(mode: "FE_DOWNWARD")) return 1;
75
76 fesetround(FE_TOWARDZERO);
77 if (iterate_cases(mode: "FE_TOWARDZERO")) return 1;
78#endif
79
80 fesetround(FE_TONEAREST);
81 if (iterate_cases(mode: "FE_TONEAREST")) return 1;
82#endif
83
84 return 0;
85}
86

source code of compiler-rt/test/builtins/Unit/compiler_rt_scalbnf_test.c