as: M32R-Warnings
9.20.3 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 does not recognize.
'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 whose 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)
Info Catalog
as: M32R-Directives
as: M32R-Dependent