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2000-12-03  Ulrich Drepper  <drepper@redhat.com>

	* math/test-misc.c (main): Add tests for frexp.
	Reported by Fred J. Tydeman <tydeman@tybor.com>.
	* sysdeps/i386/fpu/s_frexpl.S: Don't overflow during the computation.
This commit is contained in:
Ulrich Drepper
2000-12-03 10:00:46 +00:00
parent 06f55c0c1d
commit 79569444ef
3 changed files with 63 additions and 0 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2000-12-03 Ulrich Drepper <drepper@redhat.com>
* math/test-misc.c (main): Add tests for frexp.
Reported by Fred J. Tydeman <tydeman@tybor.com>.
* sysdeps/i386/fpu/s_frexpl.S: Don't overflow during the computation.
2000-12-02 H.J. Lu <hjl@gnu.org> 2000-12-02 H.J. Lu <hjl@gnu.org>
* locale/lc-time.c (_nl_init_era_entries): Pass L'\0' instead of * locale/lc-time.c (_nl_init_era_entries): Pass L'\0' instead of

37
math/test-misc.c
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@ -39,6 +39,43 @@ main (void)
result = 1; result = 1;
} }
} }
# if __GNUC__ >= 3 || __GNUC_MINOR__ >= 96
{
long double x = LDBL_MAX / ldexpl (1.0L, LDBL_MANT_DIG + 1);
long double m;
int i;
# if LDBL_MANT_DIG == 64
m = 0xf.fffffffffffffffp-4L;
# else
# error "Please adjust"
# endif
for (i = 0; i < LDBL_MANT_DIG + 1; ++i, x *= 2.0L)
{
long double r;
int e;
printf ("2^%d: ", LDBL_MAX_EXP - (LDBL_MANT_DIG + 1) + i);
r = frexpl (x, &e);
if (r != m)
{
printf ("mantissa incorrect: %.20La\n", r);
result = 1;
continue;
}
if (e != LDBL_MAX_EXP - (LDBL_MANT_DIG + 1) + i)
{
printf ("exponent wrong %d (%.20Lg)\n", e, x);
result = 1;
continue;
}
puts ("ok");
}
}
# endif
#endif #endif
{ {

20
sysdeps/i386/fpu/s_frexpl.S
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@ -32,6 +32,12 @@
ASM_TYPE_DIRECTIVE(two64,@object) ASM_TYPE_DIRECTIVE(two64,@object)
two64: .byte 0, 0, 0, 0, 0, 0, 0xf0, 0x43 two64: .byte 0, 0, 0, 0, 0, 0, 0xf0, 0x43
ASM_SIZE_DIRECTIVE(two64) ASM_SIZE_DIRECTIVE(two64)
/* The following is LDBL_MAX / ldexp (1.0, 64), the largest
number we can handle the normal way. */
ASM_TYPE_DIRECTIVE(largest,@object)
largest:
.byte 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xbe, 0x7f, 0, 0
ASM_SIZE_DIRECTIVE(largest)
#ifdef PIC #ifdef PIC
#define MO(op) op##@GOTOFF(%edx) #define MO(op) op##@GOTOFF(%edx)
@ -63,12 +69,16 @@ ENTRY (BP_SYM (__frexpl))
cmpl $0, %eax cmpl $0, %eax
je 2f je 2f
cmpl $0x7fbe, %eax
ja 4f
fldt VAL0(%esp) fldt VAL0(%esp)
#ifdef PIC #ifdef PIC
call 3f call 3f
3: popl %edx 3: popl %edx
addl $_GLOBAL_OFFSET_TABLE_+[.-3b], %edx addl $_GLOBAL_OFFSET_TABLE_+[.-3b], %edx
#endif #endif
fmull MO(two64) /* It's not necessary to use a 80bit factor */ fmull MO(two64) /* It's not necessary to use a 80bit factor */
movl $-64, %ecx movl $-64, %ecx
fstpt VAL0(%esp) fstpt VAL0(%esp)
@ -92,5 +102,15 @@ ENTRY (BP_SYM (__frexpl))
LEAVE LEAVE
ret ret
4: movl VAL2(%esp), %ecx
movl %ecx, %edx
andl $0x7fff, %ecx
andl $0x8000, %edx
subl $16382, %ecx
orl $0x3ffe, %edx
movl %edx, VAL2(%esp)
jmp 1b
END (BP_SYM (__frexpl)) END (BP_SYM (__frexpl))
weak_alias (BP_SYM (__frexpl), BP_SYM (frexpl)) weak_alias (BP_SYM (__frexpl), BP_SYM (frexpl))