[ad36f39] | 1 | <?xml version="1.0" encoding="ISO-8859-1"?> |
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[bd48e48] | 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" |
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| 3 | "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [ |
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[ad36f39] | 4 | <!ENTITY % general-entities SYSTEM "../../general.ent"> |
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| 5 | %general-entities; |
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| 6 | ]> |
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| 7 | |
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| 8 | <sect1 id="ch-cross-tools-variables"> |
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| 9 | <?dbhtml filename="variables.html"?> |
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| 10 | |
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| 11 | <title>Build Variables</title> |
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| 12 | |
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| 13 | <bridgehead renderas="sect4">Setting Host and Target</bridgehead> |
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| 14 | |
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[b220338] | 15 | <para os="a">During the building of the cross-compile tools, you will need to |
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[7926af1] | 16 | set a few variables that will be dependent on your particular needs. |
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[8ffc8f19] | 17 | You will need to select the target triplet for the target architecture, |
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| 18 | the CPU architecture, the CPU mode, the CPU floating point hardware |
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[b220338] | 19 | availability, and (if available) the type of floating point hardware. If you |
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| 20 | do not know what values can be chosen for each of these, you can use the |
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| 21 | tables at the bottom of this page as a reference.</para> |
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| 22 | |
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[8ffc8f19] | 23 | <para os="a1">If your processor is an ARM9, good choices include: triplet of |
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[a5cbaf25] | 24 | armv5l-unknown-linux-uclibeabi, ARM arch of armv5t, and float of soft. ARM9 |
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| 25 | processors do not usually have hardware floating point abilities. If your |
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| 26 | processor is a Cortex-A series, which often have hardware floating point |
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| 27 | capability, good choices include: triplet of |
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[75a0379] | 28 | armv7a-unknown-linux-musleabi, ARM arch of armv7-a, float of hard, and fpu |
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[a5cbaf25] | 29 | of vfpv3-d16.</para> |
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[c31ae75] | 30 | |
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| 31 | <para os="a2">First, set the host and target triplets:</para> |
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[ad36f39] | 32 | |
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| 33 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" |
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[7926af1] | 34 | href="../common/variables.xml" |
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[5b4806a] | 35 | xpointer="xpointer(//*[@os='b'])"/> |
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[ad36f39] | 36 | |
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[8ffc8f19] | 37 | <para os="c">Now we will set the architecture of the CPU based |
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| 38 | on the target triplet provided above:</para> |
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[ad36f39] | 39 | |
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[8ffc8f19] | 40 | <screen os="d"><userinput>export CLFS_ARCH=arm</userinput></screen> |
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[6533111] | 41 | |
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[b220338] | 42 | <para os="e">Choose the ARM architecture (see table below) and mode of |
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| 43 | your CPU:</para> |
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| 44 | |
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| 45 | <screen os="f"><userinput>export CLFS_ARM_ARCH="<replaceable>[architecture]</replaceable>" |
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| 46 | export CLFS_ARM_MODE="<replaceable>[arm or thumb]</replaceable>"</userinput></screen> |
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| 47 | |
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[a5cbaf25] | 48 | <para os="f1">If your target CPU has hardware floating point support (not all |
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| 49 | ARM CPUs do), then set the following CLFS_FLOAT variable to either "hard" or |
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| 50 | "softfp". Use "softfp" if you need to integrate binaries compiled with |
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| 51 | "soft". Use "hard" if you don't. If your target CPU does not have hard |
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| 52 | floating point support, set the following CLFS_FLOAT vairable to |
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| 53 | "soft".</para> |
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[b220338] | 54 | |
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| 55 | <screen os="f2"><userinput>export CLFS_FLOAT="<replaceable>[hard, softfp, or soft]"</replaceable></userinput></screen> |
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| 56 | |
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| 57 | <para os="f3">If you chose either "hard" or "softfp" for CLFS_FLOAT, you now |
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| 58 | need to set which floating point hardware is actually included (see table below) |
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| 59 | with your ARM CPU:</para> |
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| 60 | |
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| 61 | <screen os="f4"><userinput>export CLFS_FPU="<replaceable>[fpu version]</replaceable>"</userinput></screen> |
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| 62 | |
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[5b4806a] | 63 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" |
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[7926af1] | 64 | href="../common/variables.xml" |
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[0dad5b9] | 65 | xpointer="xpointer(//*[@os='g'])"/> |
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[6533111] | 66 | |
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[b220338] | 67 | <screen os="h"><userinput>echo export CLFS_HOST=\""${CLFS_HOST}\"" >> ~/.bashrc |
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| 68 | echo export CLFS_TARGET=\""${CLFS_TARGET}\"" >> ~/.bashrc |
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| 69 | echo export CLFS_ARCH=\""${CLFS_ARCH}\"" >> ~/.bashrc |
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| 70 | echo export CLFS_ARM_ARCH=\""${CLFS_ARM_ARCH}\"" >> ~/.bashrc |
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| 71 | echo export CLFS_ARM_MODE=\""${CLFS_ARM_MODE}\"" >> ~/.bashrc |
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| 72 | echo export CLFS_FLOAT=\""${CLFS_FLOAT}\"" >> ~/.bashrc |
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| 73 | echo export CLFS_FPU=\""${CLFS_FPU}\"" >> ~/.bashrc</userinput></screen> |
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[ad36f39] | 74 | |
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[0dad5b9] | 75 | <table os="i"> |
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[b220338] | 76 | <title>Example Processor Type, ABI, and Target Triplets</title> |
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[d44503cc] | 77 | <?dbfo table-width="7in" ?> |
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[3ca2208] | 78 | |
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[8ffc8f19] | 79 | <tgroup cols="3"> |
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[3ca2208] | 80 | |
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| 81 | <colspec colnum="1" colwidth="2.5in" colname="Processor"/> |
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[8ffc8f19] | 82 | <colspec colnum="2" colwidth="1in" colname="ABI"/> |
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| 83 | <colspec colnum="3" colwidth="2.5in" colname="Triplet"/> |
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[3ca2208] | 84 | |
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[ad36f39] | 85 | <thead> |
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| 86 | <row> |
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| 87 | <entry>Processor</entry> |
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[d44503cc] | 88 | <entry>ABI</entry> |
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[ad36f39] | 89 | <entry>Target Triplet</entry> |
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| 90 | </row> |
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| 91 | </thead> |
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[3ca2208] | 92 | |
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[ad36f39] | 93 | <tbody> |
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[ff29c76] | 94 | <row> |
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| 95 | <entry>Generic arm, version 5</entry> |
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| 96 | <entry>EABI</entry> |
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[75a0379] | 97 | <entry>armv5l-unknown-linux-musleabi</entry> |
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[ad36f39] | 98 | </row> |
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[d44503cc] | 99 | <row> |
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| 100 | <entry>Generic arm</entry> |
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| 101 | <entry>EABI</entry> |
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[75a0379] | 102 | <entry>arm-unknown-linux-musleabi</entry> |
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[d44503cc] | 103 | </row> |
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[ff29c76] | 104 | <row> |
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| 105 | <entry>Generic arm, version 7-a </entry> |
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| 106 | <entry>EABI</entry> |
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[75a0379] | 107 | <entry>armv7a-unknown-linux-musleabi</entry> |
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[ff29c76] | 108 | </row> |
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[ad36f39] | 109 | </tbody> |
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[3ca2208] | 110 | |
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[ad36f39] | 111 | </tgroup> |
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[3ca2208] | 112 | |
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[ad36f39] | 113 | </table> |
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| 114 | |
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[b220338] | 115 | <table os="j"> |
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| 116 | <title>ARM Archiecture Choices</title> |
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| 117 | <?dbfo table-width="4in" ?> |
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| 118 | |
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[5c58544] | 119 | <tgroup cols="4"> |
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[b220338] | 120 | |
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| 121 | <colspec colnum="1" colwidth="1in" colname="Arch Choice"/> |
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| 122 | <colspec colnum="2" colwidth="1in" colname="Arch Choice"/> |
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| 123 | <colspec colnum="3" colwidth="1in" colname="Arch Choice"/> |
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| 124 | <colspec colnum="4" colwidth="1in" colname="Arch Choice"/> |
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| 125 | |
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| 126 | <tbody> |
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| 127 | <row> |
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| 128 | <entry>armv4t</entry> |
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| 129 | <entry>armv5</entry> |
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| 130 | <entry>armv5t</entry> |
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[90309a2] | 131 | <entry>armv5te</entry> |
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[b220338] | 132 | </row> |
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| 133 | <row> |
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| 134 | <entry>armv6</entry> |
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| 135 | <entry>armv6j</entry> |
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| 136 | <entry>armv6t2</entry> |
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[90309a2] | 137 | <entry>armv6z</entry> |
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[b220338] | 138 | </row> |
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| 139 | <row> |
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| 140 | <entry>armv6zk</entry> |
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| 141 | <entry>armv6-m</entry> |
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| 142 | <entry>armv7</entry> |
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[90309a2] | 143 | <entry>armv7-a</entry> |
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[b220338] | 144 | </row> |
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| 145 | <row> |
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| 146 | <entry>armv7-r</entry> |
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| 147 | <entry>armv7-m</entry> |
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| 148 | </row> |
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| 149 | </tbody> |
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| 150 | </tgroup> |
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| 151 | </table> |
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| 152 | |
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| 153 | <table os="j"> |
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| 154 | <title>ARM Hard Floating Point Versions</title> |
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| 155 | <?dbfo table-width="4in" ?> |
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| 156 | |
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[5c58544] | 157 | <tgroup cols="4"> |
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[b220338] | 158 | |
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| 159 | <colspec colnum="1" colwidth="1in" colname="FPU Choice"/> |
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| 160 | <colspec colnum="2" colwidth="1in" colname="FPU Choice"/> |
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| 161 | <colspec colnum="3" colwidth="1in" colname="FPU Choice"/> |
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| 162 | <colspec colnum="4" colwidth="1in" colname="FPU Choice"/> |
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| 163 | |
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| 164 | <tbody> |
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| 165 | <row> |
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| 166 | <entry>fpa</entry> |
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| 167 | <entry>fpe2</entry> |
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| 168 | <entry>fpe3</entry> |
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| 169 | <entry>maverick</entry> |
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| 170 | </row> |
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| 171 | <row> |
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| 172 | <entry>vfp</entry> |
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| 173 | <entry>vfpv3</entry> |
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| 174 | <entry>vfpv3-fp16</entry> |
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| 175 | <entry>vfpv3-d16</entry> |
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| 176 | </row> |
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| 177 | <row> |
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| 178 | <entry>vfpv3-d16-fp16</entry> |
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| 179 | <entry>vfpv3xd</entry> |
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| 180 | <entry>vfpv3xd-fp16</entry> |
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| 181 | <entry>neon</entry> |
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| 182 | </row> |
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| 183 | <row> |
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| 184 | <entry>neon-fp16</entry> |
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| 185 | <entry>vfpv4</entry> |
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| 186 | <entry>vfpv4-d16</entry> |
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| 187 | <entry>fpv4-sp-d16</entry> |
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| 188 | </row> |
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| 189 | <row> |
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| 190 | <entry>neon-vfpv4</entry> |
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| 191 | </row> |
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| 192 | </tbody> |
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| 193 | </tgroup> |
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| 194 | </table> |
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| 195 | |
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[ad36f39] | 196 | </sect1> |
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