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(as.info)M32R-Warnings

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M32R Warnings
-------------

   There are several warning and error messages that can be produced by
`as' which are specific to the M32R:

`output of 1st instruction is the same as an input to 2nd instruction - is this intentional ?'
     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
     `mv r1, r2 || neg r3, r1' register r1 is the destination of the
     move instruction and the input to the neg instruction.

`output of 2nd instruction is the same as an input to 1st instruction - is this intentional ?'
     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 `mv r1, r2 || neg r2, r3' register r2 is the destination
     of the neg instruction and the input to the move instruction.

`instruction `...' is for the M32RX only'
     This message is produced when the assembler encounters an
     instruction which is only supported by the M32Rx processor, and
     the `-m32rx' command line flag has not been specified to allow
     assembly of such instructions.

`unknown instruction `...''
     This message is produced when the assembler encounters an
     instruction which it doe snot recognise.

`only the NOP instruction can be issued in parallel on the m32r'
     This message is produced when the assembler encounters a parallel
     instruction which does not involve a NOP instruction and the
     `-m32rx' command line flag has not been specified.  Only the M32Rx
     processor is able to execute two instructions in parallel.

`instruction `...' cannot be executed in parallel.'
     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.

`Instructions share the same execution pipeline'
     This message is produced when the assembler encounters a parallel
     instruction whoes components both use the same execution pipeline.

`Instructions write to the same destination register.'
     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: `mv r1, r2 || neg r1, r3' `jl r0 || mv r14, r1' `st r2,
     @-r1 || mv r1, r3' `mv r1, r2 || ld r0, @r1+' `cmp r1, r2 || addx
     r3, r4' (Both write to the condition bit)