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| <h4 class="subsection">9.21.3 M32R Warnings</h4> |
| |
| <p><a name="index-warnings_002c-M32R-1395"></a><a name="index-M32R-warnings-1396"></a> |
| There are several warning and error messages that can be produced by |
| <code>as</code> which are specific to the M32R: |
| |
| <dl> |
| <dt><code>output of 1st instruction is the same as an input to 2nd instruction - is this intentional ?</code><dd>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><span class="samp">mv r1, r2 || neg r3, r1</span></samp>’ register r1 is the destination of the |
| move instruction and the input to the neg instruction. |
| |
| <br><dt><code>output of 2nd instruction is the same as an input to 1st instruction - is this intentional ?</code><dd>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><span class="samp">mv r1, r2 || neg r2, r3</span></samp>’ register r2 is the destination of the |
| neg instruction and the input to the move instruction. |
| |
| <br><dt><code>instruction ‘</code><samp><span class="samp">...</span></samp><code>’ is for the M32RX only</code><dd>This message is produced when the assembler encounters an instruction |
| which is only supported by the M32Rx processor, and the ‘<samp><span class="samp">-m32rx</span></samp>’ |
| command-line flag has not been specified to allow assembly of such |
| instructions. |
| |
| <br><dt><code>unknown instruction ‘</code><samp><span class="samp">...</span></samp><code>’</code><dd>This message is produced when the assembler encounters an instruction |
| which it does not recognize. |
| |
| <br><dt><code>only the NOP instruction can be issued in parallel on the m32r</code><dd>This message is produced when the assembler encounters a parallel |
| instruction which does not involve a NOP instruction and the |
| ‘<samp><span class="samp">-m32rx</span></samp>’ command-line flag has not been specified. Only the M32Rx |
| processor is able to execute two instructions in parallel. |
| |
| <br><dt><code>instruction ‘</code><samp><span class="samp">...</span></samp><code>’ cannot be executed in parallel.</code><dd>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. |
| |
| <br><dt><code>Instructions share the same execution pipeline</code><dd>This message is produced when the assembler encounters a parallel |
| instruction whose components both use the same execution pipeline. |
| |
| <br><dt><code>Instructions write to the same destination register.</code><dd>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><span class="samp">mv r1, r2 || neg r1, r3</span></samp>’ |
| ‘<samp><span class="samp">jl r0 || mv r14, r1</span></samp>’ |
| ‘<samp><span class="samp">st r2, @-r1 || mv r1, r3</span></samp>’ |
| ‘<samp><span class="samp">mv r1, r2 || ld r0, @r1+</span></samp>’ |
| ‘<samp><span class="samp">cmp r1, r2 || addx r3, r4</span></samp>’ (Both write to the condition bit) |
| |
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