From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 126344 invoked by alias); 23 Jan 2020 13:39:07 -0000 Mailing-List: contact gcc-cvs-wwwdocs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-cvs-wwwdocs-owner@gcc.gnu.org Received: (qmail 126267 invoked by uid 9068); 23 Jan 2020 13:39:06 -0000 Date: Thu, 23 Jan 2020 13:39:00 -0000 Message-ID: <20200123133906.126263.qmail@sourceware.org> From: hubicka@gcc.gnu.org To: gcc-cvs-wwwdocs@gcc.gnu.org Subject: gcc-wwwdocs branch master updated. e2c8d26d66e9e7ed7cac2b0aa8a890751329c1c0 X-Git-Refname: refs/heads/master X-Git-Reftype: branch X-Git-Oldrev: 5492d93acc449f465f4d8ae80d338f27ef067e3c X-Git-Newrev: e2c8d26d66e9e7ed7cac2b0aa8a890751329c1c0 X-SW-Source: 2020/txt/msg00067.txt 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 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.

General Improvements

-
  • New built-in functions:
      @@ -75,15 +74,36 @@ a work-in-progress.

      removes unneeded pairs of new and delete operators. +
    • -fprofile-partial-training + can now be used to inform the compiler that code paths not covered by the + training run should not be optimized for size. +
  • - Profile driven optimization improvements: + Inter-procedural optimization improvements:
      -
    • - Using -fprofile-values, - an instrumented binary can track multiple - values (up to 4) for e.g. indirect calls and provide more precise profile information. +
    • The inter-procedural scalar replacement for aggregates (IPA-SRA) pass + was re-implemented to work at link-time. +
      • +
    • -finline-functions + is now enabled at -O2 and was retuned for better code + size versus runtime performance trade-offs. Inliner heuristics was + also significantly sped up to avoid negativive impact to -flto + -O2 compile times. +
      • +
    • Inliner heuristics and function clonning can now use value-range + information to predict effectivity of individual transformations. +
      • +
    • Most --param 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. +
      • +
    • During link-time optimization the C++ One Definition Rule is used to + increase precision of type based alias analysis.
    • @@ -96,8 +116,8 @@ a work-in-progress.

    information about a LTO bytecode object file.
  • - 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.
  • The LTO bytecode can be compressed with @@ -106,8 +126,21 @@ a work-in-progress.

+
  • + Profile driven optimization improvements: +
      +
    • Profile maintenance during compilation and hot/cold code + partitioning have been improved. +
      • +
    • + Using -fprofile-values, + an instrumented binary can track multiple + values (up to 4) for e.g. indirect calls and provide more precise + profile information. +
      • +
    +
    • -

    New Languages and Language specific improvements

    ----------------------------------------------------------------------- Summary of changes: htdocs/gcc-10/changes.html | 51 ++++++++++++++++++++++++++++++++++++++-------- 1 file changed, 42 insertions(+), 9 deletions(-) hooks/post-receive -- gcc-wwwdocs