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minix/test/test47.c
Thomas Veerman a209c3ae12 Fix a ton of compiler warnings 
This patch fixes most of current reasons to generate compiler warnings.
The changes consist of:
 - adding missing casts
 - hiding or unhiding function declarations
 - including headers where missing
 - add __UNCONST when assigning a const char * to a char *
 - adding missing return statements
 - changing some types from unsigned to signed, as the code seems to want
   signed ints
 - converting old-style function definitions to current style (i.e.,
   void func(param1, param2) short param1, param2; {...} to
   void func (short param1, short param2) {...})
 - making the compiler silent about signed vs unsigned comparisons. We
   have too many of those in the new libc to fix.

A number of bugs in the test set were fixed. These bugs were never
triggered with our old libc. Consequently, these tests are now forced to
link with the new libc or they will generate errors (in particular tests 43
and 55).

Most changes in NetBSD libc are limited to moving aroudn "#ifndef __minix"
or stuff related to Minix-specific things (code in sys-minix or gen/minix).
2011-11-14 10:07:49 +00:00

277 lines
7 KiB
C
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#include <assert.h>
#include <fenv.h>
#include <math.h>
#include <signal.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/sigcontext.h>
#define MAX_ERROR 4
static int errct;
/* maximum allowed FP difference for our tests */
#define EPSILON 0.00000000023283064365386962890625 /* 2^(-32) */
static void quit(void)
{
if (errct == 0)
{
printf("ok\n");
exit(0);
}
else
{
printf("%d errors\n", errct);
exit(1);
}
}
#define ERR(x, y) e(__LINE__, (x), (y))
static void e(int n, double x, double y)
{
printf("Line %d, x=%.20g, y=%.20g\n", n, x, y);
if (errct++ > MAX_ERROR)
{
printf("Too many errors; test aborted\n");
exit(1);
}
}
static void signal_handler(int signum)
{
struct sigframe *sigframe;
/* report signal */
sigframe = (struct sigframe *) ((char *) &signum -
(char *) &((struct sigframe *) NULL)->sf_signo);
printf("Signal %d at 0x%x\n", signum, sigframe->sf_scp->sc_regs.pc);
/* count as error */
ERR(0, 0);
fflush(stdout);
/* handle signa again next time */
signal(signum, signal_handler);
}
static void test_fpclassify(double value, int class, int test_sign)
{
/* test fpclassify */
if (fpclassify(value) != class) ERR(value, 0);
if (test_sign)
{
if (fpclassify(-value) != class) ERR(-value, 0);
/* test signbit */
if (signbit(value)) ERR(value, 0);
if (!signbit(-value)) ERR(-value, 0);
}
}
/* Maximum normal double: (2 - 2^(-53)) * 2^1023 */
#define NORMAL_DOUBLE_MAX 1.797693134862315708145274237317e+308
/* Minimum normal double: 2^(-1022) */
#define NORMAL_DOUBLE_MIN 2.2250738585072013830902327173324e-308
/* Maximum subnormal double: (1 - 2^(-53)) * 2^(-1022) */
#define SUBNORMAL_DOUBLE_MAX 2.2250738585072008890245868760859e-308
/* Minimum subnormal double: 2^(-52) * 2^(-1023) */
#define SUBNORMAL_DOUBLE_MIN 4.9406564584124654417656879286822e-324
static void test_fpclassify_values(void)
{
double d;
char negzero[] = { 0, 0, 0, 0, 0, 0, 0, 0x80 };
/* test some corner cases for fpclassify and signbit */
test_fpclassify(INFINITY, FP_INFINITE, 1);
test_fpclassify(NAN, FP_NAN, 0);
test_fpclassify(0, FP_ZERO, 0);
test_fpclassify(1, FP_NORMAL, 1);
test_fpclassify(NORMAL_DOUBLE_MAX, FP_NORMAL, 1);
test_fpclassify(NORMAL_DOUBLE_MIN, FP_NORMAL, 1);
test_fpclassify(SUBNORMAL_DOUBLE_MAX, FP_SUBNORMAL, 1);
test_fpclassify(SUBNORMAL_DOUBLE_MIN, FP_SUBNORMAL, 1);
/*
* unfortunately the minus operator does not change the sign of zero,
* so a special case is needed to test it
*/
assert(sizeof(negzero) == sizeof(double));
test_fpclassify(*(double *) negzero, FP_ZERO, 0);
if (!signbit(*(double *) negzero)) ERR(0, 0);
/* test other small numbers for fpclassify and signbit */
d = 1;
while (d >= NORMAL_DOUBLE_MIN)
{
test_fpclassify(d, FP_NORMAL, 1);
d /= 10;
}
while (d >= SUBNORMAL_DOUBLE_MIN)
{
test_fpclassify(d, FP_SUBNORMAL, 1);
d /= 10;
}
test_fpclassify(d, FP_ZERO, 0);
/* test other large numbers for fpclassify and signbit */
d = 1;
while (d <= NORMAL_DOUBLE_MAX / 10)
{
test_fpclassify(d, FP_NORMAL, 1);
d *= 10;
}
}
/* expected rounding: up, down or identical */
#define ROUND_EQ 1
#define ROUND_DN 2
#define ROUND_UP 3
static void test_round_value_mode_func(double value, int mode, double (*func)(double), int exp)
{
int mode_old;
double rounded;
/* update and check rounding mode */
mode_old = fegetround();
fesetround(mode);
if (fegetround() != mode) ERR(0, 0);
/* perform rounding */
rounded = func(value);
/* check direction of rounding */
switch (exp)
{
case ROUND_EQ: if (rounded != value) ERR(value, rounded); break;
case ROUND_DN: if (rounded >= value) ERR(value, rounded); break;
case ROUND_UP: if (rounded <= value) ERR(value, rounded); break;
default: assert(0);
}
/* check whether the number is sufficiently close */
if (fabs(value - rounded) >= 1) ERR(value, rounded);
/* check whether the number is integer */
if (remainder(rounded, 1)) ERR(value, rounded);
/* re-check and restore rounding mode */
if (fegetround() != mode) ERR(0, 0);
fesetround(mode_old);
}
static void test_round_value_mode(double value, int mode, int exp_nearbyint,
int exp_ceil, int exp_floor, int exp_trunc)
{
/* test both nearbyint and trunc */
#if 0
test_round_value_mode_func(value, mode, nearbyint, exp_nearbyint);
#endif
test_round_value_mode_func(value, mode, ceil, exp_ceil);
test_round_value_mode_func(value, mode, floor, exp_floor);
test_round_value_mode_func(value, mode, trunc, exp_trunc);
}
static void test_round_value(double value, int exp_down, int exp_near, int exp_up, int exp_trunc)
{
/* test each rounding mode */
test_round_value_mode(value, FE_DOWNWARD, exp_down, exp_up, exp_down, exp_trunc);
test_round_value_mode(value, FE_TONEAREST, exp_near, exp_up, exp_down, exp_trunc);
test_round_value_mode(value, FE_UPWARD, exp_up, exp_up, exp_down, exp_trunc);
test_round_value_mode(value, FE_TOWARDZERO, exp_trunc, exp_up, exp_down, exp_trunc);
}
static void test_round_values(void)
{
int i;
/* test various values */
for (i = -100000; i < 100000; i++)
{
test_round_value(i + 0.00, ROUND_EQ, ROUND_EQ, ROUND_EQ, ROUND_EQ);
test_round_value(i + 0.25, ROUND_DN, ROUND_DN, ROUND_UP, (i >= 0) ? ROUND_DN : ROUND_UP);
test_round_value(i + 0.50, ROUND_DN, (i % 2) ? ROUND_UP : ROUND_DN, ROUND_UP, (i >= 0) ? ROUND_DN : ROUND_UP);
test_round_value(i + 0.75, ROUND_DN, ROUND_UP, ROUND_UP, (i >= 0) ? ROUND_DN : ROUND_UP);
}
}
static void test_remainder_value(double x, double y)
{
int mode_old;
double r1, r2;
assert(y != 0);
/* compute remainder using the function */
r1 = remainder(x, y);
/* compute remainder using alternative approach */
mode_old = fegetround();
fesetround(FE_TONEAREST);
r2 = x - rint(x / y) * y;
fesetround(mode_old);
/* Compare results */
if (fabs(r1 - r2) > EPSILON && fabs(r1 + r2) > EPSILON)
{
printf("%.20g != %.20g\n", r1, r2);
ERR(x, y);
}
}
static void test_remainder_values_y(double x)
{
int i, j;
/* try various rational and transcendental values for y (except zero) */
for (i = -50; i <= 50; i++)
if (i != 0)
for (j = 1; j < 10; j++)
{
test_remainder_value(x, (double) i / (double) j);
test_remainder_value(x, i * M_E + j * M_PI);
}
}
static void test_remainder_values_xy(void)
{
int i, j;
/* try various rational and transcendental values for x */
for (i = -50; i <= 50; i++)
for (j = 1; j < 10; j++)
{
test_remainder_values_y((double) i / (double) j);
test_remainder_values_y(i * M_E + j * M_PI);
}
}
int main(int argc, char **argv)
{
fenv_t fenv;
int i;
printf("Test 47 ");
fflush(stdout);
/* no FPU errors, please */
if (feholdexcept(&fenv) < 0) ERR(0, 0);
/* some signals count as errors */
for (i = 0; i < _NSIG; i++)
if (i != SIGINT && i != SIGTERM && i != SIGKILL)
signal(i, signal_handler);
/* test various floating point support functions */
test_fpclassify_values();
test_remainder_values_xy();
test_round_values();
quit();
return -1;
}
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