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more precise float rounding tests 

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@230 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2003-06-15 19:36:33 +00:00
parent 43ce4dfe9e
commit ea76864009
1 changed files with 25 additions and 4 deletions
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29
tests/test-i386.c
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@ -527,6 +527,12 @@ void test_fcvt(double a)
{
float fa;
long double la;
int16_t fpuc;
int i;
int64_t lla;
int ia;
int16_t wa;
double ra;
fa = a;
la = a;
@ -535,9 +541,21 @@ void test_fcvt(double a)
printf("a=%016Lx\n", *(long long *)&a);
printf("la=%016Lx %04x\n", *(long long *)&la,
*(unsigned short *)((char *)(&la) + 8));
printf("a=%f floor(a)=%f\n", a, floor(a));
printf("a=%f ceil(a)=%f\n", a, ceil(a));
printf("a=%f rint(a)=%f\n", a, rint(a));
/* test all roundings */
asm volatile ("fstcw %0" : "=m" (fpuc));
for(i=0;i<4;i++) {
asm volatile ("fldcw %0" : : "m" ((fpuc & ~0x0c00) | (i << 10)));
asm volatile ("fist %0" : "=m" (wa) : "t" (a));
asm volatile ("fistl %0" : "=m" (ia) : "t" (a));
asm volatile ("fistpll %0" : "=m" (lla) : "t" (a) : "st");
asm volatile ("frndint ; fstl %0" : "=m" (ra) : "t" (a));
asm volatile ("fldcw %0" : : "m" (fpuc));
printf("(short)a = %d\n", wa);
printf("(int)a = %d\n", ia);
printf("(int64_t)a = %Ld\n", lla);
printf("rint(a) = %f\n", ra);
}
}
#define TEST(N) \
@ -625,9 +643,12 @@ void test_floats(void)
test_fcmp(2, -1);
test_fcmp(2, 2);
test_fcmp(2, 3);
test_fcvt(0.5);
test_fcvt(-0.5);
test_fcvt(1.0/7.0);
test_fcvt(-1.0/9.0);
test_fcvt(1e30);
test_fcvt(32768);
test_fcvt(-1e20);
test_fconst();
test_fbcd(1234567890123456);
test_fbcd(-123451234567890);