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diff --git a/lib/compiler/doc/src/notes.xml b/lib/compiler/doc/src/notes.xml index f92505409c..4e90f2a758 100644 --- a/lib/compiler/doc/src/notes.xml +++ b/lib/compiler/doc/src/notes.xml @@ -32,6 +32,123 @@ <p>This document describes the changes made to the Compiler application.</p> +<section><title>Compiler 8.3</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p>The compiler would silently accept singleton (unbound) + type variables in a union type. Starting from Erlang/OTP + 26, the compiler will generate a warning for this + example. The warning can be disabled using the + <c>nowarn_singleton_typevar</c> option. In Erlang/OTP 27, + the warning will become an error.</p> + <p> + Own Id: OTP-18389 Aux Id: GH-6508, PR-6864, GH-7116 </p> + </item> + </list> + </section> + + + <section><title>Improvements and New Features</title> + <list> + <item> + <p>Optimized record updates.</p> + <p> + Own Id: OTP-18126 Aux Id: PR-6033 </p> + </item> + <item> + <p>There are several new optimization for binary syntax + in the JIT:</p> <list> <item>Creation and matching of + binaries with segments of fixed sizes have been + optimized.</item> <item>Creation and matching of UTF-8 + segments have been optimized.</item> <item>Appending to + binaries has been optimized.</item> </list> + <p> + Own Id: OTP-18137 Aux Id: PR-6259, PR-6404, PR-6576, + PR-6804 </p> + </item> + <item> + <p>The compiler and JIT now generate better code for + creation of small maps where all keys are literals known + at compile time.</p> + <p> + Own Id: OTP-18185 Aux Id: GH-6139 </p> + </item> + <item> + <p>A limitation in the binary syntax has been removed. It + is now possible to match binary patterns in parallel. + Example: <c><<A:8>> = <<B:4,C:4>> + = Bin</c></p> + <p> + Own Id: OTP-18297 Aux Id: GH-6348 </p> + </item> + <item> + <p>It is documented that <c>$\^X</c> is the ASCII code + for Control X, where X is an uppercase or lowercase + letter. However, this notation would work for any + character X, even then it didn't make sense.</p> + <p>In Erlang/OTP 26, it is now documented that the + following characters are also allowed to follow the + <c>\^</c> characters: <c>@</c>, <c>[</c>, <c>\</c>, + <c>]</c>, <c>^</c>, <c>_</c>, and <c>?</c>. Attempt to + use other characters will be rejected with a compiler + error.</p> + <p>The value for <c>$\^?</c> is now 127 (instead of 31 as + in earlier releases).</p> + <p> + Own Id: OTP-18337 Aux Id: GH-6477, PR-6503 </p> + </item> + <item> + <p>The BIFs <c>min/2</c> and <c>max/2</c> are now allowed + to be used in guards and match specs.</p> + <p> + Own Id: OTP-18367 Aux Id: GH-6544 </p> + </item> + <item> + <p>Map comprehensions as suggested in EEP 58 has now been + implemented.</p> + <p> + Own Id: OTP-18413 Aux Id: EEP-58, PR-6727 </p> + </item> + <item> + <p>Improved the selective receive optimization, which can + now be enabled for references returned from other + functions.</p> + <p>This greatly improves the performance of + <c>gen_server:send_request/3</c>, + <c>gen_server:wait_response/2</c>, and similar + functions.</p> + <p> + Own Id: OTP-18431 Aux Id: PR-6739 </p> + </item> + <item> + <p> + Deprecates <c>dbg:stop_clear/0</c> because it is simply a + function alias to <c>dbg:stop/0</c></p> + <p> + Own Id: OTP-18478 Aux Id: GH-6903 </p> + </item> + <item> + <p>The compiler will now inline calls to + <c>maps:get/3</c>.</p> + <p> + Own Id: OTP-18502</p> + </item> + <item> + <p>In Erlang/OTP 27, <c>0.0</c> will no longer be + considered to be exactly equal to <c>-0.0</c>. See + <seeguide + marker="system/general_info:upcoming_incompatibilities#float_matching">Upcoming + Potential Incompatibilities</seeguide>.</p> + <p> + Own Id: OTP-18574</p> + </item> + </list> + </section> + +</section> + <section><title>Compiler 8.2.6</title> <section><title>Fixed Bugs and Malfunctions</title> |