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[Bug math/16516] New: spurious underflow exception from erff


https://sourceware.org/bugzilla/show_bug.cgi?id=16516

            Bug ID: 16516
           Summary: spurious underflow exception from erff
           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 7381
  --> https://sourceware.org/bugzilla/attachment.cgi?id=7381&action=edit
test case

on x86_64 in single precision I get with the attached program:

GNU libc version: 2.18.90
GNU libc release: development
x=0x1.c5bf94p-127 (1.041755126e-38)
libc: erff(x)=0x1.000006p-126 (1.175494771e-38) underflow=16
mpfr: erff(x)=0x1.000006p-126 (1.175494771e-38)
ulp difference: 0.000000

See http://webloria.loria.fr/~zimmerma/glibc/

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