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6 commits

Author SHA1 Message Date
Robert Griesemer
3498027329 math: increase precision of math.SmallestNonzeroFloat64
The original value was rounded too early, which lead to the
surprising behavior that float64(math.SmallestNonzeroFloat64 / 2)
wasn't 0. That is, the exact compile-time computation of
math.SmallestNonzeroFloat64 / 2 resulted in a value that was
rounded up when converting to float64. To address this, added 3
more digits to the mantissa, ending in a 0.

While at it, also slightly increased the precision of MaxFloat64
to end in a 0.

Computed exact values via https://play.golang.org/p/yt4KTpIx_wP.

Added a test to verify expected behavior.

In contrast to the other (irrational) constants, expanding these
extreme values to more digits is unlikely to be important as they
are not going to appear in numeric computations except for tests
verifying their correctness (as is the case here).

Re-enabled a disabled test in go/types and types2.

Updates #44057.
Fixes #44058.

Change-Id: I8f363155e02331354e929beabe993c8d8de75646
Reviewed-on: https://go-review.googlesource.com/c/go/+/315170
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2021-04-30 00:13:38 +00:00
Jelte Fennema
403ae5081a math: change oeis.org urls to https
Regular HTTP is insecure, oeis.org supports HTTPS and it is actually
used in some other places in the codebase. This changes these final urls
to use HTTPS.

Change-Id: Ia46410a9c7ce67238a10cb6bfffaceca46112f58
Reviewed-on: https://go-review.googlesource.com/52072
Reviewed-by: Alberto Donizetti <alb.donizetti@gmail.com>
2017-08-08 08:56:40 +00:00
Ian Lance Taylor
dc6ae87c8c math: clarify comment about bit-identical results across architectures
Updates #18354.

Change-Id: I76bc4a73d8dc99eeda14b395e451d75a65184191
Reviewed-on: https://go-review.googlesource.com/45013
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
2017-06-06 22:32:34 +00:00
gulyasm
a838191406 math: add doc note about floating point operation
Go doesn't guarantee that the result of floating point operations will
be the same on different architectures. It was not stated in the
documentation, that can lead to confusion.

Fixes #18354

Change-Id: Idb1b4c256fb9a7158a74256136eca3b8ce44476f
Reviewed-on: https://go-review.googlesource.com/34938
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2017-06-06 20:20:41 +00:00
Andrew Gerrand
895df143a2 math: explain OEIS link
Fixes #10236

Change-Id: Ife85513efda48af81c267b753da2ac7317cdfe75
Reviewed-on: https://go-review.googlesource.com/11479
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
2015-06-26 01:25:58 +00:00
Russ Cox
c007ce824d build: move package sources from src/pkg to src
Preparation was in CL 134570043.
This CL contains only the effect of 'hg mv src/pkg/* src'.
For more about the move, see golang.org/s/go14nopkg.
2014-09-08 00:08:51 -04:00
Renamed from src/pkg/math/const.go (Browse further)