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| <title>Using as: M32R-Warnings</title> |
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| <a name="M32R_002dWarnings"></a> |
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| Previous: <a href="M32R_002dDirectives.html#M32R_002dDirectives" accesskey="p" rel="prev">M32R-Directives</a>, Up: <a href="M32R_002dDependent.html#M32R_002dDependent" accesskey="u" rel="up">M32R-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="M32R-Warnings"></a> |
| <h4 class="subsection">9.22.3 M32R Warnings</h4> |
| |
| <a name="index-warnings_002c-M32R"></a> |
| <a name="index-M32R-warnings"></a> |
| |
| <p>There are several warning and error messages that can be produced by |
| <code>as</code> which are specific to the M32R: |
| </p> |
| <dl compact="compact"> |
| <dt><code>output of 1st instruction is the same as an input to 2nd instruction - is this intentional ?</code></dt> |
| <dd><p>This message is only produced if warnings for explicit parallel |
| conflicts have been enabled. It indicates that the assembler has |
| encountered a parallel instruction in which the destination register of |
| the left hand instruction is used as an input register in the right hand |
| instruction. For example in this code fragment |
| ‘<samp>mv r1, r2 || neg r3, r1</samp>’ register r1 is the destination of the |
| move instruction and the input to the neg instruction. |
| </p> |
| </dd> |
| <dt><code>output of 2nd instruction is the same as an input to 1st instruction - is this intentional ?</code></dt> |
| <dd><p>This message is only produced if warnings for explicit parallel |
| conflicts have been enabled. It indicates that the assembler has |
| encountered a parallel instruction in which the destination register of |
| the right hand instruction is used as an input register in the left hand |
| instruction. For example in this code fragment |
| ‘<samp>mv r1, r2 || neg r2, r3</samp>’ register r2 is the destination of the |
| neg instruction and the input to the move instruction. |
| </p> |
| </dd> |
| <dt><code>instruction ‘<samp>...</samp>’ is for the M32RX only</code></dt> |
| <dd><p>This message is produced when the assembler encounters an instruction |
| which is only supported by the M32Rx processor, and the ‘<samp>-m32rx</samp>’ |
| command line flag has not been specified to allow assembly of such |
| instructions. |
| </p> |
| </dd> |
| <dt><code>unknown instruction ‘<samp>...</samp>’</code></dt> |
| <dd><p>This message is produced when the assembler encounters an instruction |
| which it does not recognize. |
| </p> |
| </dd> |
| <dt><code>only the NOP instruction can be issued in parallel on the m32r</code></dt> |
| <dd><p>This message is produced when the assembler encounters a parallel |
| instruction which does not involve a NOP instruction and the |
| ‘<samp>-m32rx</samp>’ command line flag has not been specified. Only the M32Rx |
| processor is able to execute two instructions in parallel. |
| </p> |
| </dd> |
| <dt><code>instruction ‘<samp>...</samp>’ cannot be executed in parallel.</code></dt> |
| <dd><p>This message is produced when the assembler encounters a parallel |
| instruction which is made up of one or two instructions which cannot be |
| executed in parallel. |
| </p> |
| </dd> |
| <dt><code>Instructions share the same execution pipeline</code></dt> |
| <dd><p>This message is produced when the assembler encounters a parallel |
| instruction whoes components both use the same execution pipeline. |
| </p> |
| </dd> |
| <dt><code>Instructions write to the same destination register.</code></dt> |
| <dd><p>This message is produced when the assembler encounters a parallel |
| instruction where both components attempt to modify the same register. |
| For example these code fragments will produce this message: |
| ‘<samp>mv r1, r2 || neg r1, r3</samp>’ |
| ‘<samp>jl r0 || mv r14, r1</samp>’ |
| ‘<samp>st r2, @-r1 || mv r1, r3</samp>’ |
| ‘<samp>mv r1, r2 || ld r0, @r1+</samp>’ |
| ‘<samp>cmp r1, r2 || addx r3, r4</samp>’ (Both write to the condition bit) |
| </p> |
| </dd> |
| </dl> |
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