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[Bug math/15899] New: exp2f() is not monotonic


https://sourceware.org/bugzilla/show_bug.cgi?id=15899

            Bug ID: 15899
           Summary: exp2f() is not monotonic
           Product: glibc
           Version: 2.15
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
          Assignee: unassigned at sourceware dot org
          Reporter: bagnara at cs dot unipr.it

exp2f() is almost monotonic.  The only "unexpected decreases" are the ones
below:

round-near:
exp2f(-0x1.93c0c2p-10) = 0x1.ff7424p-1 < 0x1.ff7426p-1 = exp2f(-0x1.93c0c4p-10)

round-down:
exp2f(-0x1.ed062ep-10) = 0x1.ff553cp-1 < 0x1.ff553ep-1 = exp2f(-0x1.ed063p-10)
exp2f(-0x1.8c90d4p-10) = 0x1.ff76ap-1  < 0x1.ff76a2p-1 = exp2f(-0x1.8c90d6p-10)

round-up:
exp2f(-0x1.fbda98p-10) = 0x1.ff501cp-1 < 0x1.ff501ep-1 = exp2f(-0x1.fbda9ap-10)
exp2f(-0x1.e2082cp-10) = 0x1.ff590cp-1 < 0x1.ff590ep-1 = exp2f(-0x1.e2082ep-10)
exp2f(-0x1.90fd16p-10) = 0x1.ff751ap-1 < 0x1.ff751cp-1 = exp2f(-0x1.90fd18p-10)

round-zero:
exp2f(-0x1.d4d40ap-10) = 0x1.ff5d9cp-1 < 0x1.ff5d9ep-1 = exp2f(-0x1.d4d40cp-10)

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