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From: hubicka@gcc.gnu.org To: gcc-cvs-wwwdocs@gcc.gnu.org Subject: gcc-wwwdocs branch master updated. e2c8d26d66e9e7ed7cac2b0aa8a890751329c1c0 Date: Thu, 23 Jan 2020 13:39:00 -0000 [thread overview] Message-ID: <20200123133906.126263.qmail@sourceware.org> (raw) This is an automated email from the git hooks/post-receive script. It was generated because a ref change was pushed to the repository containing the project "gcc-wwwdocs". The branch, master has been updated via e2c8d26d66e9e7ed7cac2b0aa8a890751329c1c0 (commit) from 5492d93acc449f465f4d8ae80d338f27ef067e3c (commit) Those revisions listed above that are new to this repository have not appeared on any other notification email; so we list those revisions in full, below. - Log ----------------------------------------------------------------- commit e2c8d26d66e9e7ed7cac2b0aa8a890751329c1c0 Author: Jan Hubicka <hubicka@ucw.cz> Date: Thu Jan 23 14:38:34 2020 +0100 Add IPA, LTO and PGO improvements. diff --git a/htdocs/gcc-10/changes.html b/htdocs/gcc-10/changes.html index 6e75215..36eb43c 100644 --- a/htdocs/gcc-10/changes.html +++ b/htdocs/gcc-10/changes.html @@ -53,7 +53,6 @@ a work-in-progress.</p> <!-- .................................................................. --> <h2 id="general">General Improvements</h2> - <ul> <li>New built-in functions: <ul> @@ -75,15 +74,36 @@ a work-in-progress.</p> removes unneeded pairs of <code>new</code> and <code>delete</code> operators. </li> + <li><a href="https://gcc.gnu.org/onlinedocs/gcc-10.1.0/gcc/Optimize-Options.html#index-fprofile-partial-training"><code>-fprofile-partial-training</code></a> + can now be used to inform the compiler that code paths not covered by the + training run should not be optimized for size. + </li> </ul> </li> <li> - Profile driven optimization improvements: + Inter-procedural optimization improvements: <ul> - <li> - Using <a href="https://gcc.gnu.org/onlinedocs/gcc-10.1.0/gcc/Optimize-Options.html#index-fprofile-values"><code>-fprofile-values</code></a>, - an instrumented binary can track multiple - values (up to 4) for e.g. indirect calls and provide more precise profile information. + <li>The inter-procedural scalar replacement for aggregates (IPA-SRA) pass + was re-implemented to work at link-time. + </li> + <li><a href="https://gcc.gnu.org/onlinedocs/gcc-10.1.0/gcc/Optimize-Options.html#index-finline-functions"><code>-finline-functions</code></a> + is now enabled at <code>-O2</code> and was retuned for better code + size versus runtime performance trade-offs. Inliner heuristics was + also significantly sped up to avoid negativive impact to <code>-flto + -O2</code> compile times. + </li> + <li>Inliner heuristics and function clonning can now use value-range + information to predict effectivity of individual transformations. + </li> + <li>Most <code>--param</code> values can now be specified at + translation unit granuality. This includes all parameters controlling + the inliner and other inter-procedural optimizations. Unlike earlier + releases, GCC 10 will ignore parameters controlling optimizations + specified at link-time and apply parameters specified at compile-time + in the same manner as done for optimization flags. + </li> + <li>During link-time optimization the C++ One Definition Rule is used to + increase precision of type based alias analysis. </li> </ul> </li> @@ -96,8 +116,8 @@ a work-in-progress.</p> information about a LTO bytecode object file. </li> <li> - Parallel phase of the LTO can automatically detect a running make's jobserver - or can fall back to number of available cores. + Parallel phase of the LTO can automatically detect a running make's + jobserver or can fall back to number of available cores. </li> <li> The LTO bytecode can be compressed with @@ -106,8 +126,21 @@ a work-in-progress.</p> </li> </ul> </li> + <li> + Profile driven optimization improvements: + <ul> + <li>Profile maintenance during compilation and hot/cold code + partitioning have been improved. + </li> + <li> + Using <a href="https://gcc.gnu.org/onlinedocs/gcc-10.1.0/gcc/Optimize-Options.html#index-fprofile-values"><code>-fprofile-values</code></a>, + an instrumented binary can track multiple + values (up to 4) for e.g. indirect calls and provide more precise + profile information. + </li> + </ul> + </li> </ul> - <!-- .................................................................. --> <h2 id="languages">New Languages and Language specific improvements</h2> ----------------------------------------------------------------------- Summary of changes: htdocs/gcc-10/changes.html | 51 ++++++++++++++++++++++++++++++++++++++-------- 1 file changed, 42 insertions(+), 9 deletions(-) hooks/post-receive -- gcc-wwwdocs
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