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authorErlang/OTP <[email protected]>2018-03-09 11:01:07 +0100
committerErlang/OTP <[email protected]>2018-03-09 11:01:07 +0100
commit7c7ba7191a3932e737fa81fd0166df1c637d4b31 (patch)
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Update release notes
Diffstat (limited to 'lib/hipe/doc/src')
-rw-r--r--lib/hipe/doc/src/notes.xml39
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diff --git a/lib/hipe/doc/src/notes.xml b/lib/hipe/doc/src/notes.xml
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+++ b/lib/hipe/doc/src/notes.xml
@@ -31,6 +31,45 @@
</header>
<p>This document describes the changes made to HiPE.</p>
+<section><title>Hipe 3.17.1</title>
+
+ <section><title>Fixed Bugs and Malfunctions</title>
+ <list>
+ <item>
+ <p>
+ Fix HiPE bug for binary constructs like
+ <c>&lt;&lt;X/utf8&gt;&gt;</c> which could in rare cases
+ cause faulty results or VM crash.</p>
+ <p>
+ This fix affects both the <c>hipe</c> compiler and
+ <c>erts</c> runtime in an <em>incompatible</em> way. Old
+ hipe compiled files need to be recompiled to load and run
+ properly as native.</p>
+ <p>
+ *** POTENTIAL INCOMPATIBILITY ***</p>
+ <p>
+ Own Id: OTP-14850 Aux Id: PR-1664 </p>
+ </item>
+ <item>
+ <p>The BEAM compiler chooses not to perform tailcall
+ optimisations for some calls in tail position, for
+ example to some built-in functions. However, when the
+ ErLLVM HiPE backend is used, LLVM may choose to perform
+ tailcall optimisation on these calls, breaking the
+ expected semantics.</p>
+ <p>To preserve the precise semantics exhibited by BEAM,
+ the 'notail' marker, present in LLVM since version 3.8,
+ is added to call instructions that BEAM has not turned
+ into tail calls, which inhibits LLVM from performing
+ tail-call optimisation in turn.</p>
+ <p>
+ Own Id: OTP-14886</p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
<section><title>Hipe 3.17</title>
<section><title>Fixed Bugs and Malfunctions</title>