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[Bug math/16517] New: Missing underflow exception from tanf
- From: "zimmerma+gcc at loria dot fr" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Fri, 31 Jan 2014 22:58:40 +0000
- Subject: [Bug math/16517] New: Missing underflow exception from tanf
- Auto-submitted: auto-generated
https://sourceware.org/bugzilla/show_bug.cgi?id=16517
Bug ID: 16517
Summary: Missing underflow exception from tanf
Product: glibc
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: math
Assignee: unassigned at sourceware dot org
Reporter: zimmerma+gcc at loria dot fr
Created attachment 7382
--> https://sourceware.org/bugzilla/attachment.cgi?id=7382&action=edit
test program
on x86_64 the attached test program gives:
GNU libc version: 2.18.90
GNU libc release: development
x=0x1p-149 (1.401298464e-45)
libc: tanf(x)=0x1p-149 (1.401298464e-45) underflow=0
mpfr: tanf(x)=0x1p-149 (1.401298464e-45)
ulp difference: 0.000000
Since the result is the smallest positive subnormal, an underflow exception
should be raised
See http://webloria.loria.fr/~zimmerma/glibc/
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