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| Previous: <a href="Substitutions.html#Substitutions" accesskey="p" rel="prev">Substitutions</a>, Up: <a href="Mode-Iterators.html#Mode-Iterators" accesskey="u" rel="up">Mode Iterators</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p> |
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| <a name="Mode-Iterator-Examples"></a> |
| <h4 class="subsubsection">16.23.1.3 Mode Iterator Examples</h4> |
| |
| <p>Here is an example from the MIPS port. It defines the following |
| modes and attributes (among others): |
| </p> |
| <div class="smallexample"> |
| <pre class="smallexample">(define_mode_iterator GPR [SI (DI "TARGET_64BIT")]) |
| (define_mode_attr d [(SI "") (DI "d")]) |
| </pre></div> |
| |
| <p>and uses the following template to define both <code>subsi3</code> |
| and <code>subdi3</code>: |
| </p> |
| <div class="smallexample"> |
| <pre class="smallexample">(define_insn "sub<mode>3" |
| [(set (match_operand:GPR 0 "register_operand" "=d") |
| (minus:GPR (match_operand:GPR 1 "register_operand" "d") |
| (match_operand:GPR 2 "register_operand" "d")))] |
| "" |
| "<d>subu\t%0,%1,%2" |
| [(set_attr "type" "arith") |
| (set_attr "mode" "<MODE>")]) |
| </pre></div> |
| |
| <p>This is exactly equivalent to: |
| </p> |
| <div class="smallexample"> |
| <pre class="smallexample">(define_insn "subsi3" |
| [(set (match_operand:SI 0 "register_operand" "=d") |
| (minus:SI (match_operand:SI 1 "register_operand" "d") |
| (match_operand:SI 2 "register_operand" "d")))] |
| "" |
| "subu\t%0,%1,%2" |
| [(set_attr "type" "arith") |
| (set_attr "mode" "SI")]) |
| |
| (define_insn "subdi3" |
| [(set (match_operand:DI 0 "register_operand" "=d") |
| (minus:DI (match_operand:DI 1 "register_operand" "d") |
| (match_operand:DI 2 "register_operand" "d")))] |
| "" |
| "dsubu\t%0,%1,%2" |
| [(set_attr "type" "arith") |
| (set_attr "mode" "DI")]) |
| </pre></div> |
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