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| <h4 class="subsection">9.9.2 Instruction expansion</h4> |
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| <p><a name="index-instruction-expansion_002c-CRIS-903"></a><a name="index-CRIS-instruction-expansion-904"></a><code>as</code> will silently choose an instruction that fits |
| the operand size for ‘<samp><span class="samp">[register+constant]</span></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. |
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| <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>. |
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| <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>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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