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| <title>Using as: CRIS-Expand</title> |
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| Next: <a href="CRIS_002dSymbols.html#CRIS_002dSymbols" accesskey="n" rel="next">CRIS-Symbols</a>, Previous: <a href="CRIS_002dOpts.html#CRIS_002dOpts" accesskey="p" rel="prev">CRIS-Opts</a>, Up: <a href="CRIS_002dDependent.html#CRIS_002dDependent" accesskey="u" rel="up">CRIS-Dependent</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p> |
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| <a name="Instruction-expansion"></a> |
| <h4 class="subsection">9.8.2 Instruction expansion</h4> |
| |
| <a name="index-instruction-expansion_002c-CRIS"></a> |
| <a name="index-CRIS-instruction-expansion"></a> |
| <p><code>as</code> will silently choose an instruction that fits |
| the operand size for ‘<samp>[register+constant]</samp>’ operands. For |
| example, the offset <code>127</code> in <code>move.d [r3+127],r4</code> fits |
| in an instruction using a signed-byte offset. Similarly, |
| <code>move.d [r2+32767],r1</code> will generate an instruction using a |
| 16-bit offset. For symbolic expressions and constants that do |
| not fit in 16 bits including the sign bit, a 32-bit offset is |
| generated. |
| </p> |
| <p>For branches, <code>as</code> will expand from a 16-bit branch |
| instruction into a sequence of instructions that can reach a |
| full 32-bit address. Since this does not correspond to a single |
| instruction, such expansions can optionally be warned about. |
| See <a href="CRIS_002dOpts.html#CRIS_002dOpts">CRIS-Opts</a>. |
| </p> |
| <p>If the operand is found to fit the range, a <code>lapc</code> mnemonic |
| will translate to a <code>lapcq</code> instruction. Use <code>lapc.d</code> |
| to force the 32-bit <code>lapc</code> instruction. |
| </p> |
| <p>Similarly, the <code>addo</code> mnemonic will translate to the |
| shortest fitting instruction of <code>addoq</code>, <code>addo.w</code> and |
| <code>addo.d</code>, when used with a operand that is a constant known |
| at assembly time. |
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