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This change introduces the Compare and Compare32 functions based on the total-ordering predicate in IEEE-754, section 5.10. In particular, * -NaN is ordered before any other value * +NaN is ordered after any other value * -0 is ordered before +0 * All other values are ordered the usual way Compare-8 0.4537n ± 1% Compare32-8 0.3752n ± 1% geomean 0.4126n Fixes #56491. Change-Id: I5c9c77430a2872f380688c1b0a66f2105b77d5ac Reviewed-on: https://go-review.googlesource.com/c/go/+/467515 Reviewed-by: WANG Xuerui <git@xen0n.name> Run-TryBot: Ian Lance Taylor <iant@golang.org> Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com> Auto-Submit: Ian Lance Taylor <iant@google.com> Run-TryBot: Ian Lance Taylor <iant@google.com> Reviewed-by: Ian Lance Taylor <iant@google.com> Reviewed-by: Michael Pratt <mpratt@google.com> TryBot-Result: Gopher Robot <gobot@golang.org>