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define: DUK_USE_FASTINT
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feature_snippet: |
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/* Support for 48-bit signed integer duk_tval with transparent semantics. */
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#undef DUK_USE_FASTINT
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#if defined(DUK_OPT_FASTINT)
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#if !defined(DUK_F_HAVE_64BIT)
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#error DUK_OPT_FASTINT requires 64-bit integer type support at the moment
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#endif
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#define DUK_USE_FASTINT
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#endif
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related_feature_defines:
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- DUK_OPT_FASTINT
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introduced: 1.2.0
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default: false
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tags:
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- performance
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- fastpath
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description: >
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Enable support for 48-bit signed "fastint" integer values. Fastints are
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transparent to user code (both C and Ecmascript) but may be faster than
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IEEE doubles on some platforms, especially those using softints. The
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downside of fastints is increased code footprint and a small performance
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penalty for some kinds of code.
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