Commit 6bb9bc7d authored by Committed by Krzysztof Gogolewski
Invert FP conditions to eliminate the explicit NaN check.
Summary: Optimisation: we don't have to test the parity flag if we know the test has already excluded the unordered case: eg > and >= test for a zero carry flag, which can only occur for ordered operands. By reversing comparisons we can avoid testing the parity for < and <= as well. This works since: * If any of the arguments is an NaN CF gets set. Resulting in a false result. * Since this allows us to rule out NaN we can exchange the arguments and invert the direction of the arrows. Test Plan: ci/nofib Reviewers: carter, bgamari, alpmestan Reviewed By: alpmestan Subscribers: alpmestan, simonpj, jmct, rwbarton, thomie GHC Trac Issues: #15196 Differential Revision: https://phabricator.haskell.org/D4990
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