Replace obsolete isinff(...) #276
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Fixes # N/A
Proposed changes: Replace
isinff(...)with a combination ofisinf(...)andsignbit(...)Benchmark results: No changes in performance.
Test suite changes: N/A
Almost the same to #188, but more aggressive.
isinff(...)is completely remove from the source tree.Reason: Mentioned in PR188,
isinff(...)is both obsolete and non-standard. To maximized portability and suggested by GNU, we should have it replaced.