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95 lines
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<a name="Examples"></a>
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<p>
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Previous: <a rel="previous" accesskey="p" href="Substitutions.html#Substitutions">Substitutions</a>,
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Up: <a rel="up" accesskey="u" href="Mode-Iterators.html#Mode-Iterators">Mode Iterators</a>
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<h5 class="subsubsection">16.23.1.3 Mode Iterator Examples</h5>
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<p>Here is an example from the MIPS port. It defines the following
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modes and attributes (among others):
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<pre class="smallexample"> (define_mode_iterator GPR [SI (DI "TARGET_64BIT")])
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(define_mode_attr d [(SI "") (DI "d")])
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</pre>
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<p>and uses the following template to define both <code>subsi3</code>
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and <code>subdi3</code>:
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<pre class="smallexample"> (define_insn "sub<mode>3"
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[(set (match_operand:GPR 0 "register_operand" "=d")
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(minus:GPR (match_operand:GPR 1 "register_operand" "d")
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(match_operand:GPR 2 "register_operand" "d")))]
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""
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"<d>subu\t%0,%1,%2"
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[(set_attr "type" "arith")
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(set_attr "mode" "<MODE>")])
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</pre>
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<p>This is exactly equivalent to:
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<pre class="smallexample"> (define_insn "subsi3"
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[(set (match_operand:SI 0 "register_operand" "=d")
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(minus:SI (match_operand:SI 1 "register_operand" "d")
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(match_operand:SI 2 "register_operand" "d")))]
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""
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"subu\t%0,%1,%2"
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[(set_attr "type" "arith")
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(set_attr "mode" "SI")])
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(define_insn "subdi3"
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[(set (match_operand:DI 0 "register_operand" "=d")
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(minus:DI (match_operand:DI 1 "register_operand" "d")
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(match_operand:DI 2 "register_operand" "d")))]
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""
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"dsubu\t%0,%1,%2"
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[(set_attr "type" "arith")
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(set_attr "mode" "DI")])
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</pre>
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