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arduino-0018-windows
2010-03-30 21:53:44 +02:00
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<a name="i386_002dRegs"></a>Next:&nbsp;<a rel="next" accesskey="n" href="i386_002dPrefixes.html#i386_002dPrefixes">i386-Prefixes</a>,
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<h4 class="subsection">9.13.6 Register Naming</h4>
<p><a name="index-i386-registers-901"></a><a name="index-registers_002c-i386-902"></a><a name="index-x86_002d64-registers-903"></a><a name="index-registers_002c-x86_002d64-904"></a>Register operands are always prefixed with <span class="samp">%</span>. The 80386 registers
consist of
<ul>
<li>the 8 32-bit registers <span class="samp">%eax</span> (the accumulator), <span class="samp">%ebx</span>,
<span class="samp">%ecx</span>, <span class="samp">%edx</span>, <span class="samp">%edi</span>, <span class="samp">%esi</span>, <span class="samp">%ebp</span> (the
frame pointer), and <span class="samp">%esp</span> (the stack pointer).
<li>the 8 16-bit low-ends of these: <span class="samp">%ax</span>, <span class="samp">%bx</span>, <span class="samp">%cx</span>,
<span class="samp">%dx</span>, <span class="samp">%di</span>, <span class="samp">%si</span>, <span class="samp">%bp</span>, and <span class="samp">%sp</span>.
<li>the 8 8-bit registers: <span class="samp">%ah</span>, <span class="samp">%al</span>, <span class="samp">%bh</span>,
<span class="samp">%bl</span>, <span class="samp">%ch</span>, <span class="samp">%cl</span>, <span class="samp">%dh</span>, and <span class="samp">%dl</span> (These
are the high-bytes and low-bytes of <span class="samp">%ax</span>, <span class="samp">%bx</span>,
<span class="samp">%cx</span>, and <span class="samp">%dx</span>)
<li>the 6 section registers <span class="samp">%cs</span> (code section), <span class="samp">%ds</span>
(data section), <span class="samp">%ss</span> (stack section), <span class="samp">%es</span>, <span class="samp">%fs</span>,
and <span class="samp">%gs</span>.
<li>the 3 processor control registers <span class="samp">%cr0</span>, <span class="samp">%cr2</span>, and
<span class="samp">%cr3</span>.
<li>the 6 debug registers <span class="samp">%db0</span>, <span class="samp">%db1</span>, <span class="samp">%db2</span>,
<span class="samp">%db3</span>, <span class="samp">%db6</span>, and <span class="samp">%db7</span>.
<li>the 2 test registers <span class="samp">%tr6</span> and <span class="samp">%tr7</span>.
<li>the 8 floating point register stack <span class="samp">%st</span> or equivalently
<span class="samp">%st(0)</span>, <span class="samp">%st(1)</span>, <span class="samp">%st(2)</span>, <span class="samp">%st(3)</span>,
<span class="samp">%st(4)</span>, <span class="samp">%st(5)</span>, <span class="samp">%st(6)</span>, and <span class="samp">%st(7)</span>.
These registers are overloaded by 8 MMX registers <span class="samp">%mm0</span>,
<span class="samp">%mm1</span>, <span class="samp">%mm2</span>, <span class="samp">%mm3</span>, <span class="samp">%mm4</span>, <span class="samp">%mm5</span>,
<span class="samp">%mm6</span> and <span class="samp">%mm7</span>.
<li>the 8 SSE registers registers <span class="samp">%xmm0</span>, <span class="samp">%xmm1</span>, <span class="samp">%xmm2</span>,
<span class="samp">%xmm3</span>, <span class="samp">%xmm4</span>, <span class="samp">%xmm5</span>, <span class="samp">%xmm6</span> and <span class="samp">%xmm7</span>.
</ul>
<p>The AMD x86-64 architecture extends the register set by:
<ul>
<li>enhancing the 8 32-bit registers to 64-bit: <span class="samp">%rax</span> (the
accumulator), <span class="samp">%rbx</span>, <span class="samp">%rcx</span>, <span class="samp">%rdx</span>, <span class="samp">%rdi</span>,
<span class="samp">%rsi</span>, <span class="samp">%rbp</span> (the frame pointer), <span class="samp">%rsp</span> (the stack
pointer)
<li>the 8 extended registers <span class="samp">%r8</span>&ndash;<span class="samp">%r15</span>.
<li>the 8 32-bit low ends of the extended registers: <span class="samp">%r8d</span>&ndash;<span class="samp">%r15d</span>
<li>the 8 16-bit low ends of the extended registers: <span class="samp">%r8w</span>&ndash;<span class="samp">%r15w</span>
<li>the 8 8-bit low ends of the extended registers: <span class="samp">%r8b</span>&ndash;<span class="samp">%r15b</span>
<li>the 4 8-bit registers: <span class="samp">%sil</span>, <span class="samp">%dil</span>, <span class="samp">%bpl</span>, <span class="samp">%spl</span>.
<li>the 8 debug registers: <span class="samp">%db8</span>&ndash;<span class="samp">%db15</span>.
<li>the 8 SSE registers: <span class="samp">%xmm8</span>&ndash;<span class="samp">%xmm15</span>.
</ul>
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