Scheme 48 Manual | Contents | In Chapter: User's guide
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If you want to generally have your code run faster than it normally would, enter inline-values mode before loading anything. Otherwise calls to primitives (like + and cons) and in-line procedures (like not and cadr) won't be open-coded, and programs will run more slowly.

The system doesn't start in inline-values mode by default because the Scheme report permits redefinitions of built-in procedures. With this mode set, such redefinitions don't work according to the report, because previously compiled calls may have in-lined the old definition, leaving no opportunity to call the new definition.

Inline-values mode is controlled by the inline-values switch. ,set inline-values and ,unset inline-values turn it on and off.

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