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* gcc-wwwdocs branch master updated. 110c00930de9064671c58225c0dd381504949a43
@ 2023-03-02 9:52 Jakub Jelinek
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From: Jakub Jelinek @ 2023-03-02 9:52 UTC (permalink / raw)
To: gcc-cvs-wwwdocs
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commit 110c00930de9064671c58225c0dd381504949a43
Author: Jakub Jelinek <jakub@redhat.com>
Date: Thu Mar 2 10:52:04 2023 +0100
Document excess precision.
diff --git a/htdocs/gcc-13/changes.html b/htdocs/gcc-13/changes.html
index 811d9bdf..410594ae 100644
--- a/htdocs/gcc-13/changes.html
+++ b/htdocs/gcc-13/changes.html
@@ -236,6 +236,21 @@ a work-in-progress.</p>
<h3 id="cxx">C++</h3>
<ul>
+ <li>Excess precision support (which has been available in C since GCC 4.5)
+ has been implemented for C++ as well. It is enabled by default
+ in strict standard modes like <code>-std=c++17</code>, where it
+ defaults to <code>-fexcess-precision=standard</code>, while in GNU
+ standard modes like <code>-std=gnu++20</code> it defaults to
+ <code>-fexcess-precision=fast</code>. The option mainly affects
+ IA-32/x86-64 using x87 math and in some cases on Motorola 68000,
+ where <code>float</code> and <code>double</code> expressions
+ are evaluated in <code>long double</code> precision and S/390, System z,
+ IBM z Systems where <code>float</code> expressions are evaluated in
+ <code>double</code> precision. Also, on several architectures where
+ <code>std::float16_t</code> or <code>std::bfloat16_t</code> types
+ are supported those are evaluated in <code>float</code> precision.
+ <code>-fexcess-precision=fast</code> restores previous behavior.
+ </li>
<li>Several C++23 features have been implemented:
<ul>
<li><a href="https://wg21.link/p2324">P2324R1</a>, Labels at the end of
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Summary of changes:
htdocs/gcc-13/changes.html | 15 +++++++++++++++
1 file changed, 15 insertions(+)
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