diff options
Diffstat (limited to 'share/doc/gcc/Basic-PowerPC-Built_002din-Functions-Available-on-ISA-2_002e05.html')
| -rw-r--r-- | share/doc/gcc/Basic-PowerPC-Built_002din-Functions-Available-on-ISA-2_002e05.html | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/share/doc/gcc/Basic-PowerPC-Built_002din-Functions-Available-on-ISA-2_002e05.html b/share/doc/gcc/Basic-PowerPC-Built_002din-Functions-Available-on-ISA-2_002e05.html new file mode 100644 index 0000000..5a8f618 --- /dev/null +++ b/share/doc/gcc/Basic-PowerPC-Built_002din-Functions-Available-on-ISA-2_002e05.html @@ -0,0 +1,197 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<html> +<!-- This file documents the use of the GNU compilers. + +Copyright (C) 1988-2023 Free Software Foundation, Inc. + +Permission is granted to copy, distribute and/or modify this document +under the terms of the GNU Free Documentation License, Version 1.3 or +any later version published by the Free Software Foundation; with the +Invariant Sections being "Funding Free Software", the Front-Cover +Texts being (a) (see below), and with the Back-Cover Texts being (b) +(see below). A copy of the license is included in the section entitled +"GNU Free Documentation License". + +(a) The FSF's Front-Cover Text is: + +A GNU Manual + +(b) The FSF's Back-Cover Text is: + +You have freedom to copy and modify this GNU Manual, like GNU + software. Copies published by the Free Software Foundation raise + funds for GNU development. --> +<!-- Created by GNU Texinfo 5.1, http://www.gnu.org/software/texinfo/ --> +<head> +<title>Using the GNU Compiler Collection (GCC): Basic PowerPC Built-in Functions Available on ISA 2.05</title> + +<meta name="description" content="Using the GNU Compiler Collection (GCC): Basic PowerPC Built-in Functions Available on ISA 2.05"> +<meta name="keywords" content="Using the GNU Compiler Collection (GCC): Basic PowerPC Built-in Functions Available on ISA 2.05"> +<meta name="resource-type" content="document"> +<meta name="distribution" content="global"> +<meta name="Generator" content="makeinfo"> +<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> +<link href="index.html#Top" rel="start" title="Top"> +<link href="Indices.html#Indices" rel="index" title="Indices"> +<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> +<link href="Basic-PowerPC-Built_002din-Functions.html#Basic-PowerPC-Built_002din-Functions" rel="up" title="Basic PowerPC Built-in Functions"> +<link href="Basic-PowerPC-Built_002din-Functions-Available-on-ISA-2_002e06.html#Basic-PowerPC-Built_002din-Functions-Available-on-ISA-2_002e06" rel="next" title="Basic PowerPC Built-in Functions Available on ISA 2.06"> +<link href="Basic-PowerPC-Built_002din-Functions-Available-on-all-Configurations.html#Basic-PowerPC-Built_002din-Functions-Available-on-all-Configurations" rel="previous" title="Basic PowerPC Built-in Functions Available on all Configurations"> +<style type="text/css"> +<!-- +a.summary-letter {text-decoration: none} +blockquote.smallquotation {font-size: smaller} +div.display {margin-left: 3.2em} +div.example {margin-left: 3.2em} +div.indentedblock {margin-left: 3.2em} +div.lisp {margin-left: 3.2em} +div.smalldisplay {margin-left: 3.2em} +div.smallexample {margin-left: 3.2em} +div.smallindentedblock {margin-left: 3.2em; font-size: smaller} +div.smalllisp {margin-left: 3.2em} +kbd {font-style:oblique} +pre.display {font-family: inherit} +pre.format {font-family: inherit} +pre.menu-comment {font-family: serif} +pre.menu-preformatted {font-family: serif} +pre.smalldisplay {font-family: inherit; font-size: smaller} +pre.smallexample {font-size: smaller} +pre.smallformat {font-family: inherit; font-size: smaller} +pre.smalllisp {font-size: smaller} +span.nocodebreak {white-space:nowrap} +span.nolinebreak {white-space:nowrap} +span.roman {font-family:serif; font-weight:normal} +span.sansserif {font-family:sans-serif; font-weight:normal} +ul.no-bullet {list-style: none} +--> +</style> + + +</head> + +<body lang="en_US" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> +<a name="Basic-PowerPC-Built_002din-Functions-Available-on-ISA-2_002e05"></a> +<div class="header"> +<p> +Next: <a href="Basic-PowerPC-Built_002din-Functions-Available-on-ISA-2_002e06.html#Basic-PowerPC-Built_002din-Functions-Available-on-ISA-2_002e06" accesskey="n" rel="next">Basic PowerPC Built-in Functions Available on ISA 2.06</a>, Previous: <a href="Basic-PowerPC-Built_002din-Functions-Available-on-all-Configurations.html#Basic-PowerPC-Built_002din-Functions-Available-on-all-Configurations" accesskey="p" rel="previous">Basic PowerPC Built-in Functions Available on all Configurations</a>, Up: <a href="Basic-PowerPC-Built_002din-Functions.html#Basic-PowerPC-Built_002din-Functions" accesskey="u" rel="up">Basic PowerPC Built-in Functions</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Indices.html#Indices" title="Index" rel="index">Index</a>]</p> +</div> +<hr> +<a name="Basic-PowerPC-Built_002din-Functions-Available-on-ISA-2_002e05-1"></a> +<h4 class="subsubsection">6.60.22.2 Basic PowerPC Built-in Functions Available on ISA 2.05</h4> + +<p>The basic built-in functions described in this section are +available on the PowerPC family of processors starting with ISA 2.05 +or later. Unless specific options are explicitly disabled on the +command line, specifying option <samp>-mcpu=power6</samp> has the effect of +enabling the <samp>-mpowerpc64</samp>, <samp>-mpowerpc-gpopt</samp>, +<samp>-mpowerpc-gfxopt</samp>, <samp>-mmfcrf</samp>, <samp>-mpopcntb</samp>, +<samp>-mfprnd</samp>, <samp>-mcmpb</samp>, <samp>-mhard-dfp</samp>, and +<samp>-mrecip-precision</samp> options. Specify the +<samp>-maltivec</samp> option explicitly in +combination with the above options if desired. +</p> +<p>The following functions require option <samp>-mcmpb</samp>. +</p><div class="smallexample"> +<pre class="smallexample">unsigned long long __builtin_cmpb (unsigned long long int, unsigned long long int); +unsigned int __builtin_cmpb (unsigned int, unsigned int); +</pre></div> + +<p>The <code>__builtin_cmpb</code> function +performs a byte-wise compare on the contents of its two arguments, +returning the result of the byte-wise comparison as the returned +value. For each byte comparison, the corresponding byte of the return +value holds 0xff if the input bytes are equal and 0 if the input bytes +are not equal. If either of the arguments to this built-in function +is wider than 32 bits, the function call expands into the form that +expects <code>unsigned long long int</code> arguments +which is only available on 64-bit targets. +</p> +<p>The following built-in functions are available +when hardware decimal floating point +(<samp>-mhard-dfp</samp>) is available: +</p><div class="smallexample"> +<pre class="smallexample">void __builtin_set_fpscr_drn(int); +_Decimal64 __builtin_ddedpd (int, _Decimal64); +_Decimal128 __builtin_ddedpdq (int, _Decimal128); +_Decimal64 __builtin_denbcd (int, _Decimal64); +_Decimal128 __builtin_denbcdq (int, _Decimal128); +_Decimal64 __builtin_diex (long long, _Decimal64); +_Decimal128 _builtin_diexq (long long, _Decimal128); +_Decimal64 __builtin_dscli (_Decimal64, int); +_Decimal128 __builtin_dscliq (_Decimal128, int); +_Decimal64 __builtin_dscri (_Decimal64, int); +_Decimal128 __builtin_dscriq (_Decimal128, int); +long long __builtin_dxex (_Decimal64); +long long __builtin_dxexq (_Decimal128); +_Decimal128 __builtin_pack_dec128 (unsigned long long, unsigned long long); +unsigned long long __builtin_unpack_dec128 (_Decimal128, int); + +The <code>__builtin_set_fpscr_drn</code> builtin allows changing the three decimal +floating point rounding mode bits. The argument is a 3-bit value. The +argument can either be a <code>const int</code> or the value can be stored in +a variable. +The builtin uses the ISA 3.0 instruction <code>mffscdrn</code> if available. +Otherwise the builtin reads the FPSCR, masks the current decimal rounding +mode bits out and OR's in the new value. + +</pre></div> + +<p>The following functions require <samp>-mhard-float</samp>, +<samp>-mpowerpc-gfxopt</samp>, and <samp>-mpopcntb</samp> options. +</p> +<div class="smallexample"> +<pre class="smallexample">double __builtin_recipdiv (double, double); +float __builtin_recipdivf (float, float); +double __builtin_rsqrt (double); +float __builtin_rsqrtf (float); +</pre></div> + +<p>The <code>vec_rsqrt</code>, <code>__builtin_rsqrt</code>, and +<code>__builtin_rsqrtf</code> functions generate multiple instructions to +implement the reciprocal sqrt functionality using reciprocal sqrt +estimate instructions. +</p> +<p>The <code>__builtin_recipdiv</code>, and <code>__builtin_recipdivf</code> +functions generate multiple instructions to implement division using +the reciprocal estimate instructions. +</p> +<p>The following functions require <samp>-mhard-float</samp> and +<samp>-mmultiple</samp> options. +</p> +<p>The <code>__builtin_unpack_longdouble</code> function takes a +<code>long double</code> argument and a compile time constant of 0 or 1. If +the constant is 0, the first <code>double</code> within the +<code>long double</code> is returned, otherwise the second <code>double</code> +is returned. The <code>__builtin_unpack_longdouble</code> function is only +available if <code>long double</code> uses the IBM extended double +representation. +</p> +<p>The <code>__builtin_pack_longdouble</code> function takes two <code>double</code> +arguments and returns a <code>long double</code> value that combines the two +arguments. The <code>__builtin_pack_longdouble</code> function is only +available if <code>long double</code> uses the IBM extended double +representation. +</p> +<p>The <code>__builtin_unpack_ibm128</code> function takes a <code>__ibm128</code> +argument and a compile time constant of 0 or 1. If the constant is 0, +the first <code>double</code> within the <code>__ibm128</code> is returned, +otherwise the second <code>double</code> is returned. +</p> +<p>The <code>__builtin_pack_ibm128</code> function takes two <code>double</code> +arguments and returns a <code>__ibm128</code> value that combines the two +arguments. +</p> +<p>Additional built-in functions are available for the 64-bit PowerPC +family of processors, for efficient use of 128-bit floating point +(<code>__float128</code>) values. +</p> +<hr> +<div class="header"> +<p> +Next: <a href="Basic-PowerPC-Built_002din-Functions-Available-on-ISA-2_002e06.html#Basic-PowerPC-Built_002din-Functions-Available-on-ISA-2_002e06" accesskey="n" rel="next">Basic PowerPC Built-in Functions Available on ISA 2.06</a>, Previous: <a href="Basic-PowerPC-Built_002din-Functions-Available-on-all-Configurations.html#Basic-PowerPC-Built_002din-Functions-Available-on-all-Configurations" accesskey="p" rel="previous">Basic PowerPC Built-in Functions Available on all Configurations</a>, Up: <a href="Basic-PowerPC-Built_002din-Functions.html#Basic-PowerPC-Built_002din-Functions" accesskey="u" rel="up">Basic PowerPC Built-in Functions</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Indices.html#Indices" title="Index" rel="index">Index</a>]</p> +</div> + + + +</body> +</html> |