467 lines
9.5 KiB
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467 lines
9.5 KiB
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>optimize | Common Lisp Nova Spec</TITLE
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><A HREF="index.html"
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>Common Lisp Nova Spec</A
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> <SPAN CLASS="breadcrumb-item"
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>3. Evaluation and Compilation</A
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>→ <A HREF="3_8_Evaluation_and_Compilation_Dictionary.html"
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>3.8 Evaluation and Compilation Dictionary</A
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> <SPAN CLASS="breadcrumb-item"
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>→ <A HREF="m_optimize.html"
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>optimize</A
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>←</A
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></DIV
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><DIV CLASS="matter"
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><TD ALIGN="LEFT" VALIGN="BASELINE" WIDTH="100%" CLASS="name"
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><SPAN CLASS="idx" DATA-KIND="idxref" DATA-TERM="optimize"
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></SPAN
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><B
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>optimize</B
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></TD
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><TD ALIGN="RIGHT" VALIGN="BASELINE" WIDTH="0" NOWRAP="NOWRAP" CLASS="ftype"
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><I
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>Declaration</I
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></TD
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></TR
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><DL
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><DT
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><B
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>Syntax</B
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></DT
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><DD
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><P CLASS="j"
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><CODE CLASS="f"
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>(optimize <SPAN CLASS="cmsy"
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>{</SPAN
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><VAR CLASS="param"
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>quality</VAR
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> | (<VAR CLASS="param"
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>quality</VAR
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> <VAR CLASS="param"
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>value</VAR
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>)<SPAN CLASS="cmsy"
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>}</SPAN
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><SPAN CLASS="cmr"
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>*</SPAN
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>)</CODE
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></P
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></DD
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><DT
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><SPAN CLASS="idx" DATA-KIND="idxref" DATA-TERM="compilation-speed"
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></SPAN
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><SPAN CLASS="idx" DATA-KIND="idxref" DATA-TERM="debug"
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></SPAN
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><SPAN CLASS="idx" DATA-KIND="idxref" DATA-TERM="safety"
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></SPAN
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><SPAN CLASS="idx" DATA-KIND="idxref" DATA-TERM="space"
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></SPAN
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><SPAN CLASS="idx" DATA-KIND="idxref" DATA-TERM="speed"
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></SPAN
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><B
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>Arguments</B
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></DT
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><DD
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><P CLASS="j"
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><VAR CLASS="param"
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>quality</VAR
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> — an <A HREF="26_1_Glossary.html#optimize_quality"
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><EM CLASS="term"
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>optimize quality</EM
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></A
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>. </P
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><P CLASS="j"
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><VAR CLASS="param"
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>value</VAR
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> — one of the <A HREF="26_1_Glossary.html#integer"
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><EM CLASS="term"
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>integers</EM
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></A
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> <CODE CLASS="f"
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>0</CODE
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>, <CODE CLASS="f"
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>1</CODE
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>, <CODE CLASS="f"
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>2</CODE
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>, or <CODE CLASS="f"
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>3</CODE
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>.</P
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></DD
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><DT
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><B
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>Valid Context</B
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></DT
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><DD
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><P CLASS="j"
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><A HREF="26_1_Glossary.html#declaration"
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><EM CLASS="term"
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>declaration</EM
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></A
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> or <A HREF="26_1_Glossary.html#proclamation"
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><EM CLASS="term"
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>proclamation</EM
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></A
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></P
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></DD
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><DT
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><B
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>Description</B
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></DT
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><DD
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><P CLASS="j"
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>Advises the compiler that each <VAR CLASS="param"
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>quality</VAR
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> should be given attention according to the specified corresponding <VAR CLASS="param"
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>value</VAR
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>. Each <VAR CLASS="param"
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>quality</VAR
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> must be a <A HREF="26_1_Glossary.html#symbol"
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><EM CLASS="term"
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>symbol</EM
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></A
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> naming an <A HREF="26_1_Glossary.html#optimize_quality"
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><EM CLASS="term"
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>optimize quality</EM
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></A
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>; the names and meanings of the standard <VAR CLASS="param"
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>optimize qualities</VAR
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> are shown in Figure 3–25.</P
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><FIGURE CLASS="boxfig"
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><DIV CLASS="figbody"
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><TABLE CELLSPACING="0" CELLPADDING="0" RULES="GROUPS" STYLE="margin: 1ex 0" WIDTH="100%"
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><THEAD
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><TR
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><TH ALIGN="LEFT" VALIGN="BASELINE" STYLE=";padding-right:3px"
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><B
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>Name</B
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></TH
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><TH ALIGN="LEFT" VALIGN="BASELINE" STYLE="padding-left:3px;"
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> <B
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>Meaning</B
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></TH
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></TR
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></THEAD
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><TBODY
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><TR
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><TD ALIGN="LEFT" VALIGN="BASELINE" STYLE=";padding-right:3px"
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> <SPAN CLASS="declref"
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><B
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>compilation-speed</B
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></SPAN
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></TD
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><TD ALIGN="LEFT" VALIGN="BASELINE" STYLE="padding-left:3px;"
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> <SPAN CLASS="cmr"
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>speed</SPAN
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> <SPAN CLASS="cmr"
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>of</SPAN
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> <SPAN CLASS="cmr"
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>the</SPAN
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> <SPAN CLASS="cmr"
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>compilation</SPAN
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> <SPAN CLASS="cmr"
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>process</SPAN
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></TD
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></TR
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><TR
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><TD ALIGN="LEFT" VALIGN="BASELINE" STYLE=";padding-right:3px"
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> <SPAN CLASS="declref"
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><B
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>debug</B
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></SPAN
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></TD
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><TD ALIGN="LEFT" VALIGN="BASELINE" STYLE="padding-left:3px;"
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> <SPAN CLASS="cmr"
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>ease</SPAN
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> <SPAN CLASS="cmr"
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>of</SPAN
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> <SPAN CLASS="cmr"
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>debugging</SPAN
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></TD
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></TR
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><TR
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><TD ALIGN="LEFT" VALIGN="BASELINE" STYLE=";padding-right:3px"
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> <SPAN CLASS="declref"
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><B
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>safety</B
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></SPAN
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></TD
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><TD ALIGN="LEFT" VALIGN="BASELINE" STYLE="padding-left:3px;"
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> <SPAN CLASS="cmr"
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>run-time</SPAN
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> <SPAN CLASS="cmr"
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>error</SPAN
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> <SPAN CLASS="cmr"
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>checking</SPAN
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></TD
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></TR
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><TR
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><TD ALIGN="LEFT" VALIGN="BASELINE" STYLE=";padding-right:3px"
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> <SPAN CLASS="declref"
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><B
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>space</B
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></SPAN
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></TD
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><TD ALIGN="LEFT" VALIGN="BASELINE" STYLE="padding-left:3px;"
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> <SPAN CLASS="cmr"
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>both</SPAN
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> <SPAN CLASS="cmr"
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>code</SPAN
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> <SPAN CLASS="cmr"
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>size</SPAN
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> <SPAN CLASS="cmr"
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>and</SPAN
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> <SPAN CLASS="cmr"
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>run-time</SPAN
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> <SPAN CLASS="cmr"
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>space</SPAN
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></TD
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></TR
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><TR
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><TD ALIGN="LEFT" VALIGN="BASELINE" STYLE=";padding-right:3px"
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> <SPAN CLASS="declref"
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><B
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>speed</B
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></SPAN
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></TD
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><TD ALIGN="LEFT" VALIGN="BASELINE" STYLE="padding-left:3px;"
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> <SPAN CLASS="cmr"
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>speed</SPAN
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> <SPAN CLASS="cmr"
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>of</SPAN
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> <SPAN CLASS="cmr"
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>the</SPAN
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> <SPAN CLASS="cmr"
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>object</SPAN
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> <SPAN CLASS="cmr"
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>code</SPAN
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></TD
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></TR
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></TBODY
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></TABLE
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></DIV
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><FIGCAPTION CLASS="caption"
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><B
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>Figure 3–25. Optimize qualities</B
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></FIGCAPTION
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></FIGURE
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><P CLASS="j"
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>There may be other, <A HREF="26_1_Glossary.html#implementation-defined"
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><EM CLASS="term"
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>implementation-defined</EM
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></A
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> <EM CLASS="term"
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>optimize qualities</EM
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>. </P
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><P CLASS="j"
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>A <VAR CLASS="param"
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>value</VAR
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> <CODE CLASS="f"
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>0</CODE
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> means that the corresponding <VAR CLASS="param"
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>quality</VAR
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> is totally unimportant, and <CODE CLASS="f"
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>3</CODE
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> that the <VAR CLASS="param"
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>quality</VAR
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> is extremely important; <CODE CLASS="f"
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>1</CODE
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> and <CODE CLASS="f"
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>2</CODE
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> are intermediate values, with <CODE CLASS="f"
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>1</CODE
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> the neutral value. <CODE CLASS="f"
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>(<VAR CLASS="param"
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>quality</VAR
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> 3)</CODE
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> can be abbreviated to <VAR CLASS="param"
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>quality</VAR
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>. </P
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><P CLASS="j"
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>Note that <A HREF="26_1_Glossary.html#code"
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><EM CLASS="term"
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>code</EM
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></A
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> which has the optimization <CODE CLASS="f"
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>(safety 3)</CODE
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>, or just <SPAN CLASS="typeref"
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><B
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>safety</B
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></SPAN
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>, is called <A HREF="26_1_Glossary.html#safe"
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><EM CLASS="term"
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>safe</EM
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></A
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> <A HREF="26_1_Glossary.html#code"
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><EM CLASS="term"
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>code</EM
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></A
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>. </P
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><P CLASS="j"
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>The consequences are unspecified if a <VAR CLASS="param"
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>quality</VAR
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> appears more than once with <A HREF="26_1_Glossary.html#different"
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><EM CLASS="term"
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>different</EM
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></A
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> <VAR CLASS="param"
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>values</VAR
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>.</P
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></DD
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||
|
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><DT
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||
|
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><B
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|
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>Examples</B
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|
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></DT
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||
|
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><DD
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||
|
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><PRE CLASS="screen"
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|
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>(defun often-used-subroutine (x y)
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(declare (optimize (safety 2)))
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(error-check x y)
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(hairy-setup x)
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(do ((i 0 (+ i 1))
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(z x (cdr z)))
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((null z))
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;; This inner loop really needs to burn.
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(declare (optimize speed))
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(declare (fixnum i))
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))</PRE
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></DD
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|
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><DT
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||
|
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><B
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|
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>See Also</B
|
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></DT
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><DD
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><P CLASS="j"
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><A HREF="m_declare.html" CLASS="misc"
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><B
|
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>declare</B
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></A
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>, <A HREF="f_declaim.html" CLASS="macref"
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><B
|
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>declaim</B
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></A
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>, <A HREF="f_proclaim.html" CLASS="funref"
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><B
|
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>proclaim</B
|
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></A
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>, <A HREF="3_3_Declarations.html#sec_3_3_4" CLASS="secref"
|
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><SPAN CLASS="cmr"
|
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>Section</SPAN
|
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> <SPAN CLASS="cmr"
|
||
|
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>3.3.4</SPAN
|
||
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> <SPAN CLASS="cmr"
|
||
|
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>(Declaration</SPAN
|
||
|
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> <SPAN CLASS="cmr"
|
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|
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>Scope)</SPAN
|
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></A
|
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></P
|
||
|
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></DD
|
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><DT
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><B
|
||
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>Notes</B
|
||
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></DT
|
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|
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><DD
|
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|
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><P CLASS="j"
|
||
|
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>An <A HREF="m_optimize.html" CLASS="declref"
|
||
|
|
><B
|
||
|
|
>optimize</B
|
||
|
|
></A
|
||
|
|
> declaration never applies to either a <A HREF="26_1_Glossary.html#variable"
|
||
|
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><EM CLASS="term"
|
||
|
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>variable</EM
|
||
|
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></A
|
||
|
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> or a <A HREF="26_1_Glossary.html#function"
|
||
|
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><EM CLASS="term"
|
||
|
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>function</EM
|
||
|
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></A
|
||
|
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> <A HREF="26_1_Glossary.html#binding"
|
||
|
|
><EM CLASS="term"
|
||
|
|
>binding</EM
|
||
|
|
></A
|
||
|
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>. An <A HREF="m_optimize.html" CLASS="declref"
|
||
|
|
><B
|
||
|
|
>optimize</B
|
||
|
|
></A
|
||
|
|
> declaration can only be a <A HREF="26_1_Glossary.html#free_declaration"
|
||
|
|
><EM CLASS="term"
|
||
|
|
>free declaration</EM
|
||
|
|
></A
|
||
|
|
>. For more information, see <A HREF="3_3_Declarations.html#sec_3_3_4" CLASS="secref"
|
||
|
|
><SPAN CLASS="cmr"
|
||
|
|
>Section</SPAN
|
||
|
|
> <SPAN CLASS="cmr"
|
||
|
|
>3.3.4</SPAN
|
||
|
|
> <SPAN CLASS="cmr"
|
||
|
|
>(Declaration</SPAN
|
||
|
|
> <SPAN CLASS="cmr"
|
||
|
|
>Scope)</SPAN
|
||
|
|
></A
|
||
|
|
>.</P
|
||
|
|
></DD
|
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|
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>Conversion to HTML copyright 2023 by Gilbert Baumann</DIV
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