toolchain/gcc-linaro-6.3.1-2017.02-x8.../share/doc/as.html/Bignums.html

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<h4 class="subsubsection">3.6.2.2 Bignums</h4>
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<p>A <em>bignum</em> has the same syntax and semantics as an integer
except that the number (or its negative) takes more than 32 bits to
represent in binary. The distinction is made because in some places
integers are permitted while bignums are not.
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