Using as: M32R-Opts

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#### 9.22.1 M32R Options

The Renease M32R version of `as` has a few machine dependent options:

`-m32rx`

  `as` can assemble code for several different members of the Renesas M32R family. Normally the default is to assemble code for the M32R microprocessor. This option may be used to change the default to the M32RX microprocessor, which adds some more instructions to the basic M32R instruction set, and some additional parameters to some of the original instructions.

`-m32r2`

  This option changes the target processor to the M32R2 microprocessor.

`-m32r`

  This option can be used to restore the assembler’s default behaviour of assembling for the M32R microprocessor. This can be useful if the default has been changed by a previous command line option.

`-little`

  This option tells the assembler to produce little-endian code and data. The default is dependent upon how the toolchain was configured.

`-EL`

  This is a synonym for -little.

`-big`

  This option tells the assembler to produce big-endian code and data.

`-EB`

  This is a synonum for -big.

`-KPIC`

  This option specifies that the output of the assembler should be marked as position-independent code (PIC).

`-parallel`

  This option tells the assembler to attempts to combine two sequential instructions into a single, parallel instruction, where it is legal to do so.

`-no-parallel`

  This option disables a previously enabled -parallel option.

`-no-bitinst`

  This option disables the support for the extended bit-field instructions provided by the M32R2. If this support needs to be re-enabled the -bitinst switch can be used to restore it.

`-O`

  This option tells the assembler to attempt to optimize the instructions that it produces. This includes filling delay slots and converting sequential instructions into parallel ones. This option implies -parallel.

`-warn-explicit-parallel-conflicts`

  Instructs `as` to produce warning messages when questionable parallel instructions are encountered. This option is enabled by default, but `gcc` disables it when it invokes `as` directly. Questionable instructions are those whose behaviour would be different if they were executed sequentially. For example the code fragment ‘`mv r1, r2 || mv r3, r1`’ produces a different result from ‘`mv r1, r2 \n mv r3, r1`’ since the former moves r1 into r3 and then r2 into r1, whereas the later moves r2 into r1 and r3.

`-Wp`

  This is a shorter synonym for the -warn-explicit-parallel-conflicts option.

`-no-warn-explicit-parallel-conflicts`

  Instructs `as` not to produce warning messages when questionable parallel instructions are encountered.

`-Wnp`

  This is a shorter synonym for the -no-warn-explicit-parallel-conflicts option.

`-ignore-parallel-conflicts`

  This option tells the assembler’s to stop checking parallel instructions for constraint violations. This ability is provided for hardware vendors testing chip designs and should not be used under normal circumstances.

`-no-ignore-parallel-conflicts`

  This option restores the assembler’s default behaviour of checking parallel instructions to detect constraint violations.

`-Ip`

  This is a shorter synonym for the -ignore-parallel-conflicts option.

`-nIp`

  This is a shorter synonym for the -no-ignore-parallel-conflicts option.

`-warn-unmatched-high`

  This option tells the assembler to produce a warning message if a `.high` pseudo op is encountered without a matching `.low` pseudo op. The presence of such an unmatched pseudo op usually indicates a programming error.

`-no-warn-unmatched-high`

  Disables a previously enabled -warn-unmatched-high option.

`-Wuh`

  This is a shorter synonym for the -warn-unmatched-high option.

`-Wnuh`

  This is a shorter synonym for the -no-warn-unmatched-high option.

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