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[Bug math/19594] New: [ldbl-128ibm] roundl incorrect in non-default rounding modes
- From: "jsm28 at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Tue, 09 Feb 2016 23:53:48 +0000
- Subject: [Bug math/19594] New: [ldbl-128ibm] roundl incorrect in non-default rounding modes
- Auto-submitted: auto-generated
https://sourceware.org/bugzilla/show_bug.cgi?id=19594
Bug ID: 19594
Summary: [ldbl-128ibm] roundl incorrect in non-default rounding
modes
Product: glibc
Version: 2.23
Status: NEW
Severity: normal
Priority: P2
Component: math
Assignee: unassigned at sourceware dot org
Reporter: jsm28 at gcc dot gnu.org
Target Milestone: ---
The ldbl-128ibm implementation of roundl is incorrect in non-default rounding
modes. Errors include incorrect signs of zero results, spurious overflow
exceptions, and other incorrect results; some examples follow. I have a patch
for 2.24.
Failure: Test: round_downward (min_subnorm_value)
Result:
is: -0.00000000000000000000000000000000e+00
-0x0.000000000000000000000000000p+0
should be: 0.00000000000000000000000000000000e+00
0x0.000000000000000000000000000p+0
difference: 0.00000000000000000000000000000000e+00
0x0.000000000000000000000000000p+0
ulp : 0.0000
max.ulp : 0.0000
Failure: round_downward (-max_value): Exception "Overflow" set
Failure: Test: round_downward (-max_value)
Result:
is: -inf -inf
should be: -1.79769313486231580793728971405302e+308
-0x1.fffffffffffff7ffffffffffff8p+1023
Failure: Test: round_downward (0.8)
Result:
is: -0.00000000000000000000000000000000e+00
-0x0.000000000000000000000000000p+0
should be: 1.00000000000000000000000000000000e+00
0x1.000000000000000000000000000p+0
difference: 1.00000000000000000000000000000000e+00
0x1.000000000000000000000000000p+0
ulp : 40564819207303340847894502572032.0000
max.ulp : 0.0000
(Such errors appear rounding upward and to zero as well.)
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