[Bug target/115317] New: [avr] isinf should return -1 for -Inf

[gjl at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115317

            Bug ID: 115317
           Summary: [avr] isinf should return -1 for -Inf
           Product: gcc
           Version: 14.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gjl at gcc dot gnu.org
  Target Milestone: ---

The isinf implementation in LibF7 currently returns a bool-ish value.
However, isinf(-Inf) = -1 should be returned.