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-rw-r--r--test/math/ilogb.c51
1 files changed, 51 insertions, 0 deletions
diff --git a/test/math/ilogb.c b/test/math/ilogb.c
new file mode 100644
index 000000000..e439f8c37
--- /dev/null
+++ b/test/math/ilogb.c
@@ -0,0 +1,51 @@
+#include <math.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <limits.h>
+#include <stdio.h>
+
+#define check_d1(func, param, expected) \
+do { \
+ int err; hex_union ur; hex_union up; \
+ double result = func(param); up.f = param; ur.f = result; \
+ errors += (err = (result != (expected))); \
+ err \
+ ? printf("FAIL: %s(%g/"HEXFMT")=%g/"HEXFMT" (expected %g)\n", \
+ #func, (double)(param), (long long)up.hex, result, (long long)ur.hex, (double)(expected)) \
+ : printf("PASS: %s(%g)=%g\n", #func, (double)(param), result); \
+} while (0)
+
+#define check_i1(func, param, expected) \
+do { \
+ int err; hex_union up; \
+ long long result = func(param); up.f = param; \
+ errors += (err = (result != (expected))); \
+ err \
+ ? printf("FAIL: %s(%g/"HEXFMT")=%lld/%llu (expected %llu)\n", \
+ #func, (double)(param), (long long)up.hex, result, result, (long long)(expected)) \
+ : printf("PASS: %s(%g)=%lld/%llu\n", #func, (double)(param), result, result); \
+} while (0)
+
+#define HEXFMT "%08llx"
+typedef union {
+ double f;
+ uint64_t hex;
+} hex_union;
+
+double nan_value = 0.0;
+int errors = 0;
+
+int main(void)
+{
+ nan_value /= nan_value;
+
+ check_i1(ilogb, 0.0, FP_ILOGB0);
+ check_i1(ilogb, HUGE_VAL, INT_MAX);
+ check_i1(ilogb, nan_value, FP_ILOGBNAN);
+ check_i1(ilogbf, 0.0, FP_ILOGB0);
+ check_i1(ilogbf, HUGE_VALF, INT_MAX);
+ check_i1(ilogbf, nan_value, FP_ILOGBNAN);
+
+ printf("Errors: %d\n", errors);
+ return errors;
+}