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[Bug math/18569] New: [x86/x86_64] expm1l wrong sign of underflowing zero results
- From: "jsm28 at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Sun, 21 Jun 2015 18:26:44 +0000
- Subject: [Bug math/18569] New: [x86/x86_64] expm1l wrong sign of underflowing zero results
- Auto-submitted: auto-generated
https://sourceware.org/bugzilla/show_bug.cgi?id=18569
Bug ID: 18569
Summary: [x86/x86_64] expm1l wrong sign of underflowing zero
results
Product: glibc
Version: 2.21
Status: NEW
Severity: normal
Priority: P2
Component: math
Assignee: unassigned at sourceware dot org
Reporter: jsm28 at gcc dot gnu.org
Target Milestone: ---
Target: i?86-*-* x86_64-*-*
In the x86 / x86_64 implementations of expm1l, when expm1l's result should
underflow to 0, it can be a zero of the wrong sign.
Failure: Test: expm1_towardzero (-0x8p-16448)
Result:
is: 0.00000000000000000000e+00 0x0.00000000000000000000p+0
should be: -0.00000000000000000000e+00 -0x0.00000000000000000000p+0
difference: 0.00000000000000000000e+00 0x0.00000000000000000000p+0
ulp : 0.0000
max.ulp : 4.0000
Failure: Test: expm1_upward (-0x8p-16448)
Result:
is: 0.00000000000000000000e+00 0x0.00000000000000000000p+0
should be: -0.00000000000000000000e+00 -0x0.00000000000000000000p+0
difference: 0.00000000000000000000e+00 0x0.00000000000000000000p+0
ulp : 0.0000
max.ulp : 4.0000
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