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<title>Xtensa Relaxation - Using as</title>
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<h4 class="subsection">9.36.4 Xtensa Relaxation</h4>
<p><a name="index-relaxation-1863"></a>
When an instruction operand is outside the range allowed for that
particular instruction field, <span class="command">as</span> can transform the code
to use a functionally-equivalent instruction or sequence of
instructions. This process is known as <dfn>relaxation</dfn>. This is
typically done for branch instructions because the distance of the
branch targets is not known until assembly-time. The Xtensa assembler
offers branch relaxation and also extends this concept to function
calls, <code>MOVI</code> instructions and other instructions with immediate
fields.
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<li><a accesskey="1" href="Xtensa-Branch-Relaxation.html#Xtensa-Branch-Relaxation">Xtensa Branch Relaxation</a>: Relaxation of Branches.
<li><a accesskey="2" href="Xtensa-Call-Relaxation.html#Xtensa-Call-Relaxation">Xtensa Call Relaxation</a>: Relaxation of Function Calls.
<li><a accesskey="3" href="Xtensa-Immediate-Relaxation.html#Xtensa-Immediate-Relaxation">Xtensa Immediate Relaxation</a>: Relaxation of other Immediate Fields.
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