From: Andreas Jaeger <aj@suse.de>
To: libc-hacker@sources.redhat.com
Subject: Fix BZ 2549: Denormalized return
Date: Sat, 27 Oct 2007 14:56:00 -0000 [thread overview]
Message-ID: <87hckcppx0.fsf@suse.de> (raw)
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The appended patch handles denormalized values in libm-test.
Ok to commit?
Andreas
2006-04-14 H.J. Lu <hongjiu.lu@intel.com>
[BZ #2549]
* math/libm-test.inc (check_float_internal): Support
denormalized return.
--- math/libm-test.inc.ulp 2006-04-14 09:15:03.000000000 -0700
+++ math/libm-test.inc 2006-04-14 10:28:11.000000000 -0700
@@ -487,11 +487,23 @@ check_float_internal (const char *test_n
else
{
diff = FUNC(fabs) (computed - expected);
- /* ilogb (0) isn't allowed. */
- if (expected == 0.0)
- ulp = diff / FUNC(ldexp) (1.0, - MANT_DIG);
- else
- ulp = diff / FUNC(ldexp) (1.0, FUNC(ilogb) (expected) - MANT_DIG);
+ switch (fpclassify (expected))
+ {
+ case FP_ZERO:
+ /* ilogb (0) isn't allowed. */
+ ulp = diff / FUNC(ldexp) (1.0, - MANT_DIG);
+ break;
+ case FP_NORMAL:
+ ulp = diff / FUNC(ldexp) (1.0, FUNC(ilogb) (expected) - MANT_DIG);
+ break;
+ case FP_SUBNORMAL:
+ ulp = FUNC(ldexp) (diff, MANT_DIG) / FUNC(ldexp) (1.0, FUNC(ilogb) (expected));
+ break;
+ default:
+ /* It should never happen. */
+ abort ();
+ break;
+ }
set_max_error (ulp, curr_max_error);
print_diff = 1;
if ((exceptions & IGNORE_ZERO_INF_SIGN) == 0
--
Andreas Jaeger, Director Platform / openSUSE, aj@suse.de
SUSE LINUX Products GmbH, GF: Markus Rex, HRB 16746 (AG Nürnberg)
Maxfeldstr. 5, 90409 Nürnberg, Germany
GPG fingerprint = 93A3 365E CE47 B889 DF7F FED1 389A 563C C272 A126
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next reply other threads:[~2007-10-27 14:56 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-27 14:56 Andreas Jaeger [this message]
2007-10-28 1:15 ` Ulrich Drepper
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