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@c Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
@c Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
@c 2000, 2003, 2004
@c 2000, 2003, 2004
@c Free Software Foundation, Inc.
@c Free Software Foundation, Inc.
@c This is part of the GAS manual.
@c This is part of the GAS manual.
@c For copying conditions, see the file as.texinfo.
@c For copying conditions, see the file as.texinfo.
@ifset GENERIC
@ifset GENERIC
@page
@page
@node M32R-Dependent
@node M32R-Dependent
@chapter M32R Dependent Features
@chapter M32R Dependent Features
@end ifset
@end ifset
@ifclear GENERIC
@ifclear GENERIC
@node Machine Dependencies
@node Machine Dependencies
@chapter M32R Dependent Features
@chapter M32R Dependent Features
@end ifclear
@end ifclear
 
 
@cindex M32R support
@cindex M32R support
@menu
@menu
* M32R-Opts::                   M32R Options
* M32R-Opts::                   M32R Options
* M32R-Directives::             M32R Directives
* M32R-Directives::             M32R Directives
* M32R-Warnings::               M32R Warnings
* M32R-Warnings::               M32R Warnings
@end menu
@end menu
 
 
@node M32R-Opts
@node M32R-Opts
@section M32R Options
@section M32R Options
 
 
@cindex options, M32R
@cindex options, M32R
@cindex M32R options
@cindex M32R options
 
 
The Renease M32R version of @code{@value{AS}} has a few machine
The Renease M32R version of @code{@value{AS}} has a few machine
dependent options:
dependent options:
 
 
@table @code
@table @code
 
 
@item -m32rx
@item -m32rx
@cindex @samp{-m32rx} option, M32RX
@cindex @samp{-m32rx} option, M32RX
@cindex architecture options, M32RX
@cindex architecture options, M32RX
@cindex M32R architecture options
@cindex M32R architecture options
@code{@value{AS}} can assemble code for several different members of the
@code{@value{AS}} can assemble code for several different members of the
Renesas M32R family.  Normally the default is to assemble code for
Renesas M32R family.  Normally the default is to assemble code for
the M32R microprocessor.  This option may be used to change the default
the M32R microprocessor.  This option may be used to change the default
to the M32RX microprocessor, which adds some more instructions to the
to the M32RX microprocessor, which adds some more instructions to the
basic M32R instruction set, and some additional parameters to some of
basic M32R instruction set, and some additional parameters to some of
the original instructions.
the original instructions.
 
 
@item -m32r2
@item -m32r2
@cindex @samp{-m32rx} option, M32R2
@cindex @samp{-m32rx} option, M32R2
@cindex architecture options, M32R2
@cindex architecture options, M32R2
@cindex M32R architecture options
@cindex M32R architecture options
This option changes the target processor to the the M32R2
This option changes the target processor to the the M32R2
microprocessor.
microprocessor.
 
 
@item -m32r
@item -m32r
@cindex @samp{-m32r} option, M32R
@cindex @samp{-m32r} option, M32R
@cindex architecture options, M32R
@cindex architecture options, M32R
@cindex M32R architecture options
@cindex M32R architecture options
This option can be used to restore the assembler's default behaviour of
This option can be used to restore the assembler's default behaviour of
assembling for the M32R microprocessor.  This can be useful if the
assembling for the M32R microprocessor.  This can be useful if the
default has been changed by a previous command line option.
default has been changed by a previous command line option.
 
 
@item -little
@item -little
@cindex @code{-little} option, M32R
@cindex @code{-little} option, M32R
This option tells the assembler to produce little-endian code and
This option tells the assembler to produce little-endian code and
data.  The default is dependent upon how the toolchain was
data.  The default is dependent upon how the toolchain was
configured.
configured.
 
 
@item -EL
@item -EL
@cindex @code{-EL} option, M32R
@cindex @code{-EL} option, M32R
This is a synonym for @emph{-little}.
This is a synonym for @emph{-little}.
 
 
@item -big
@item -big
@cindex @code{-big} option, M32R
@cindex @code{-big} option, M32R
This option tells the assembler to produce big-endian code and
This option tells the assembler to produce big-endian code and
data.
data.
 
 
@item -EB
@item -EB
@cindex @code{-EB} option, M32R
@cindex @code{-EB} option, M32R
This is a synonum for @emph{-big}.
This is a synonum for @emph{-big}.
 
 
@item -KPIC
@item -KPIC
@cindex @code{-KPIC} option, M32R
@cindex @code{-KPIC} option, M32R
@cindex PIC code generation for M32R
@cindex PIC code generation for M32R
This option specifies that the output of the assembler should be
This option specifies that the output of the assembler should be
marked as position-independent code (PIC).
marked as position-independent code (PIC).
 
 
@item -parallel
@item -parallel
@cindex @code{-parallel} option, M32RX
@cindex @code{-parallel} option, M32RX
This option tells the assembler to attempts to combine two sequential
This option tells the assembler to attempts to combine two sequential
instructions into a single, parallel instruction, where it is legal to
instructions into a single, parallel instruction, where it is legal to
do so.
do so.
 
 
@item -no-parallel
@item -no-parallel
@cindex @code{-no-parallel} option, M32RX
@cindex @code{-no-parallel} option, M32RX
This option disables a previously enabled @emph{-parallel} option.
This option disables a previously enabled @emph{-parallel} option.
 
 
@item -no-bitinst
@item -no-bitinst
@cindex @samp{-no-bitinst}, M32R2
@cindex @samp{-no-bitinst}, M32R2
This option disables the support for the extended bit-field
This option disables the support for the extended bit-field
instructions provided by the M32R2.  If this support needs to be
instructions provided by the M32R2.  If this support needs to be
re-enabled the @emph{-bitinst} switch can be used to restore it.
re-enabled the @emph{-bitinst} switch can be used to restore it.
 
 
@item -O
@item -O
@cindex @code{-O} option, M32RX
@cindex @code{-O} option, M32RX
This option tells the assembler to attempt to optimize the
This option tells the assembler to attempt to optimize the
instructions that it produces.  This includes filling delay slots and
instructions that it produces.  This includes filling delay slots and
converting sequential instructions into parallel ones.  This option
converting sequential instructions into parallel ones.  This option
implies @emph{-parallel}.
implies @emph{-parallel}.
 
 
@item -warn-explicit-parallel-conflicts
@item -warn-explicit-parallel-conflicts
@cindex @samp{-warn-explicit-parallel-conflicts} option, M32RX
@cindex @samp{-warn-explicit-parallel-conflicts} option, M32RX
Instructs @code{@value{AS}} to produce warning messages when
Instructs @code{@value{AS}} to produce warning messages when
questionable parallel instructions are encountered.  This option is
questionable parallel instructions are encountered.  This option is
enabled by default, but @code{@value{GCC}} disables it when it invokes
enabled by default, but @code{@value{GCC}} disables it when it invokes
@code{@value{AS}} directly.  Questionable instructions are those whose
@code{@value{AS}} directly.  Questionable instructions are those whose
behaviour would be different if they were executed sequentially.  For
behaviour would be different if they were executed sequentially.  For
example the code fragment @samp{mv r1, r2 || mv r3, r1} produces a
example the code fragment @samp{mv r1, r2 || mv r3, r1} produces a
different result from @samp{mv r1, r2 \n mv r3, r1} since the former
different result from @samp{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
moves r1 into r3 and then r2 into r1, whereas the later moves r2 into r1
and r3.
and r3.
 
 
@item -Wp
@item -Wp
@cindex @samp{-Wp} option, M32RX
@cindex @samp{-Wp} option, M32RX
This is a shorter synonym for the @emph{-warn-explicit-parallel-conflicts}
This is a shorter synonym for the @emph{-warn-explicit-parallel-conflicts}
option.
option.
 
 
@item -no-warn-explicit-parallel-conflicts
@item -no-warn-explicit-parallel-conflicts
@cindex @samp{-no-warn-explicit-parallel-conflicts} option, M32RX
@cindex @samp{-no-warn-explicit-parallel-conflicts} option, M32RX
Instructs @code{@value{AS}} not to produce warning messages when
Instructs @code{@value{AS}} not to produce warning messages when
questionable parallel instructions are encountered.
questionable parallel instructions are encountered.
 
 
@item -Wnp
@item -Wnp
@cindex @samp{-Wnp} option, M32RX
@cindex @samp{-Wnp} option, M32RX
This is a shorter synonym for the @emph{-no-warn-explicit-parallel-conflicts}
This is a shorter synonym for the @emph{-no-warn-explicit-parallel-conflicts}
option.
option.
 
 
@item -ignore-parallel-conflicts
@item -ignore-parallel-conflicts
@cindex @samp{-ignore-parallel-conflicts} option, M32RX
@cindex @samp{-ignore-parallel-conflicts} option, M32RX
This option tells the assembler's to stop checking parallel
This option tells the assembler's to stop checking parallel
instructions for constraint violations.  This ability is provided for
instructions for constraint violations.  This ability is provided for
hardware vendors testing chip designs and should not be used under
hardware vendors testing chip designs and should not be used under
normal circumstances.
normal circumstances.
 
 
@item -no-ignore-parallel-conflicts
@item -no-ignore-parallel-conflicts
@cindex @samp{-no-ignore-parallel-conflicts} option, M32RX
@cindex @samp{-no-ignore-parallel-conflicts} option, M32RX
This option restores the assembler's default behaviour of checking
This option restores the assembler's default behaviour of checking
parallel instructions to detect constraint violations.
parallel instructions to detect constraint violations.
 
 
@item -Ip
@item -Ip
@cindex @samp{-Ip} option, M32RX
@cindex @samp{-Ip} option, M32RX
This is a shorter synonym for the @emph{-ignore-parallel-conflicts}
This is a shorter synonym for the @emph{-ignore-parallel-conflicts}
option.
option.
 
 
@item -nIp
@item -nIp
@cindex @samp{-nIp} option, M32RX
@cindex @samp{-nIp} option, M32RX
This is a shorter synonym for the @emph{-no-ignore-parallel-conflicts}
This is a shorter synonym for the @emph{-no-ignore-parallel-conflicts}
option.
option.
 
 
@item -warn-unmatched-high
@item -warn-unmatched-high
@cindex @samp{-warn-unmatched-high} option, M32R
@cindex @samp{-warn-unmatched-high} option, M32R
This option tells the assembler to produce a warning message if a
This option tells the assembler to produce a warning message if a
@code{.high} pseudo op is encountered without a matching @code{.low}
@code{.high} pseudo op is encountered without a matching @code{.low}
pseudo op.  The presence of such an unmatched pseudo op usually
pseudo op.  The presence of such an unmatched pseudo op usually
indicates a programming error.
indicates a programming error.
 
 
@item -no-warn-unmatched-high
@item -no-warn-unmatched-high
@cindex @samp{-no-warn-unmatched-high} option, M32R
@cindex @samp{-no-warn-unmatched-high} option, M32R
Disables a previously enabled @emph{-warn-unmatched-high} option.
Disables a previously enabled @emph{-warn-unmatched-high} option.
 
 
@item -Wuh
@item -Wuh
@cindex @samp{-Wuh} option, M32RX
@cindex @samp{-Wuh} option, M32RX
This is a shorter synonym for the @emph{-warn-unmatched-high} option.
This is a shorter synonym for the @emph{-warn-unmatched-high} option.
 
 
@item -Wnuh
@item -Wnuh
@cindex @samp{-Wnuh} option, M32RX
@cindex @samp{-Wnuh} option, M32RX
This is a shorter synonym for the @emph{-no-warn-unmatched-high} option.
This is a shorter synonym for the @emph{-no-warn-unmatched-high} option.
 
 
@end table
@end table
 
 
@node M32R-Directives
@node M32R-Directives
@section M32R Directives
@section M32R Directives
@cindex directives, M32R
@cindex directives, M32R
@cindex M32R directives
@cindex M32R directives
 
 
The Renease M32R version of @code{@value{AS}} has a few architecture
The Renease M32R version of @code{@value{AS}} has a few architecture
specific directives:
specific directives:
 
 
@table @code
@table @code
 
 
@cindex @code{low} directive, M32R
@cindex @code{low} directive, M32R
@item low @var{expression}
@item low @var{expression}
The @code{low} directive computes the value of its expression and
The @code{low} directive computes the value of its expression and
places the lower 16-bits of the result into the immediate-field of the
places the lower 16-bits of the result into the immediate-field of the
instruction.  For example:
instruction.  For example:
 
 
@smallexample
@smallexample
   or3   r0, r0, #low(0x12345678) ; compute r0 = r0 | 0x5678
   or3   r0, r0, #low(0x12345678) ; compute r0 = r0 | 0x5678
   add3, r0, r0, #low(fred)   ; compute r0 = r0 + low 16-bits of address of fred
   add3, r0, r0, #low(fred)   ; compute r0 = r0 + low 16-bits of address of fred
@end smallexample
@end smallexample
 
 
@item high @var{expression}
@item high @var{expression}
@cindex @code{high} directive, M32R
@cindex @code{high} directive, M32R
The @code{high} directive computes the value of its expression and
The @code{high} directive computes the value of its expression and
places the upper 16-bits of the result into the immediate-field of the
places the upper 16-bits of the result into the immediate-field of the
instruction.  For example:
instruction.  For example:
 
 
@smallexample
@smallexample
   seth  r0, #high(0x12345678) ; compute r0 = 0x12340000
   seth  r0, #high(0x12345678) ; compute r0 = 0x12340000
   seth, r0, #high(fred)       ; compute r0 = upper 16-bits of address of fred
   seth, r0, #high(fred)       ; compute r0 = upper 16-bits of address of fred
@end smallexample
@end smallexample
 
 
@item shigh @var{expression}
@item shigh @var{expression}
@cindex @code{shigh} directive, M32R
@cindex @code{shigh} directive, M32R
The @code{shigh} directive is very similar to the @code{high}
The @code{shigh} directive is very similar to the @code{high}
directive.  It also computes the value of its expression and places
directive.  It also computes the value of its expression and places
the upper 16-bits of the result into the immediate-field of the
the upper 16-bits of the result into the immediate-field of the
instruction.  The difference is that @code{shigh} also checks to see
instruction.  The difference is that @code{shigh} also checks to see
if the lower 16-bits could be interpreted as a signed number, and if
if the lower 16-bits could be interpreted as a signed number, and if
so it assumes that a borrow will occur from the upper-16 bits.  To
so it assumes that a borrow will occur from the upper-16 bits.  To
compensate for this the @code{shigh} directive pre-biases the upper
compensate for this the @code{shigh} directive pre-biases the upper
16 bit value by adding one to it.  For example:
16 bit value by adding one to it.  For example:
 
 
For example:
For example:
 
 
@smallexample
@smallexample
   seth  r0, #shigh(0x12345678) ; compute r0 = 0x12340000
   seth  r0, #shigh(0x12345678) ; compute r0 = 0x12340000
   seth  r0, #shigh(0x00008000) ; compute r0 = 0x00010000
   seth  r0, #shigh(0x00008000) ; compute r0 = 0x00010000
@end smallexample
@end smallexample
 
 
In the second example the lower 16-bits are 0x8000.  If these are
In the second example the lower 16-bits are 0x8000.  If these are
treated as a signed value and sign extended to 32-bits then the value
treated as a signed value and sign extended to 32-bits then the value
becomes 0xffff8000.  If this value is then added to 0x00010000 then
becomes 0xffff8000.  If this value is then added to 0x00010000 then
the result is 0x00008000.
the result is 0x00008000.
 
 
This behaviour is to allow for the different semantics of the
This behaviour is to allow for the different semantics of the
@code{or3} and @code{add3} instructions.  The @code{or3} instruction
@code{or3} and @code{add3} instructions.  The @code{or3} instruction
treats its 16-bit immediate argument as unsigned whereas the
treats its 16-bit immediate argument as unsigned whereas the
@code{add3} treats its 16-bit immediate as a signed value.  So for
@code{add3} treats its 16-bit immediate as a signed value.  So for
example:
example:
 
 
@smallexample
@smallexample
   seth  r0, #shigh(0x00008000)
   seth  r0, #shigh(0x00008000)
   add3  r0, r0, #low(0x00008000)
   add3  r0, r0, #low(0x00008000)
@end smallexample
@end smallexample
 
 
Produces the correct result in r0, whereas:
Produces the correct result in r0, whereas:
 
 
@smallexample
@smallexample
   seth  r0, #shigh(0x00008000)
   seth  r0, #shigh(0x00008000)
   or3   r0, r0, #low(0x00008000)
   or3   r0, r0, #low(0x00008000)
@end smallexample
@end smallexample
 
 
Stores 0xffff8000 into r0.
Stores 0xffff8000 into r0.
 
 
Note - the @code{shigh} directive does not know where in the assembly
Note - the @code{shigh} directive does not know where in the assembly
source code the lower 16-bits of the value are going set, so it cannot
source code the lower 16-bits of the value are going set, so it cannot
check to make sure that an @code{or3} instruction is being used rather
check to make sure that an @code{or3} instruction is being used rather
than an @code{add3} instruction.  It is up to the programmer to make
than an @code{add3} instruction.  It is up to the programmer to make
sure that correct directives are used.
sure that correct directives are used.
 
 
@cindex @code{.m32r} directive, M32R
@cindex @code{.m32r} directive, M32R
@item .m32r
@item .m32r
The directive performs a similar thing as the @emph{-m32r} command
The directive performs a similar thing as the @emph{-m32r} command
line option.  It tells the assembler to only accept M32R instructions
line option.  It tells the assembler to only accept M32R instructions
from now on.  An instructions from later M32R architectures are
from now on.  An instructions from later M32R architectures are
refused.
refused.
 
 
@cindex @code{.m32rx} directive, M32RX
@cindex @code{.m32rx} directive, M32RX
@item .m32rx
@item .m32rx
The directive performs a similar thing as the @emph{-m32rx} command
The directive performs a similar thing as the @emph{-m32rx} command
line option.  It tells the assembler to start accepting the extra
line option.  It tells the assembler to start accepting the extra
instructions in the M32RX ISA as well as the ordinary M32R ISA.
instructions in the M32RX ISA as well as the ordinary M32R ISA.
 
 
@cindex @code{.m32r2} directive, M32R2
@cindex @code{.m32r2} directive, M32R2
@item .m32r2
@item .m32r2
The directive performs a similar thing as the @emph{-m32r2} command
The directive performs a similar thing as the @emph{-m32r2} command
line option.  It tells the assembler to start accepting the extra
line option.  It tells the assembler to start accepting the extra
instructions in the M32R2 ISA as well as the ordinary M32R ISA.
instructions in the M32R2 ISA as well as the ordinary M32R ISA.
 
 
@cindex @code{.little} directive, M32RX
@cindex @code{.little} directive, M32RX
@item .little
@item .little
The directive performs a similar thing as the @emph{-little} command
The directive performs a similar thing as the @emph{-little} command
line option.  It tells the assembler to start producing little-endian
line option.  It tells the assembler to start producing little-endian
code and data.  This option should be used with care as producing
code and data.  This option should be used with care as producing
mixed-endian binary files is fraught with danger.
mixed-endian binary files is fraught with danger.
 
 
@cindex @code{.big} directive, M32RX
@cindex @code{.big} directive, M32RX
@item .big
@item .big
The directive performs a similar thing as the @emph{-big} command
The directive performs a similar thing as the @emph{-big} command
line option.  It tells the assembler to start producing big-endian
line option.  It tells the assembler to start producing big-endian
code and data.  This option should be used with care as producing
code and data.  This option should be used with care as producing
mixed-endian binary files is fraught with danger.
mixed-endian binary files is fraught with danger.
 
 
@end table
@end table
 
 
@node M32R-Warnings
@node M32R-Warnings
@section M32R Warnings
@section M32R Warnings
 
 
@cindex warnings, M32R
@cindex warnings, M32R
@cindex M32R warnings
@cindex M32R warnings
 
 
There are several warning and error messages that can be produced by
There are several warning and error messages that can be produced by
@code{@value{AS}} which are specific to the M32R:
@code{@value{AS}} which are specific to the M32R:
 
 
@table @code
@table @code
 
 
@item output of 1st instruction is the same as an input to 2nd instruction - is this intentional ?
@item 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
This message is only produced if warnings for explicit parallel
conflicts have been enabled.  It indicates that the assembler has
conflicts have been enabled.  It indicates that the assembler has
encountered a parallel instruction in which the destination register of
encountered a parallel instruction in which the destination register of
the left hand instruction is used as an input register in the right hand
the left hand instruction is used as an input register in the right hand
instruction.  For example in this code fragment
instruction.  For example in this code fragment
@samp{mv r1, r2 || neg r3, r1} register r1 is the destination of the
@samp{mv r1, r2 || neg r3, r1} register r1 is the destination of the
move instruction and the input to the neg instruction.
move instruction and the input to the neg instruction.
 
 
@item output of 2nd instruction is the same as an input to 1st instruction - is this intentional ?
@item 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
This message is only produced if warnings for explicit parallel
conflicts have been enabled.  It indicates that the assembler has
conflicts have been enabled.  It indicates that the assembler has
encountered a parallel instruction in which the destination register of
encountered a parallel instruction in which the destination register of
the right hand instruction is used as an input register in the left hand
the right hand instruction is used as an input register in the left hand
instruction.  For example in this code fragment
instruction.  For example in this code fragment
@samp{mv r1, r2 || neg r2, r3} register r2 is the destination of the
@samp{mv r1, r2 || neg r2, r3} register r2 is the destination of the
neg instruction and the input to the move instruction.
neg instruction and the input to the move instruction.
 
 
@item instruction @samp{...} is for the M32RX only
@item instruction @samp{...} is for the M32RX only
This message is produced when the assembler encounters an instruction
This message is produced when the assembler encounters an instruction
which is only supported by the M32Rx processor, and the @samp{-m32rx}
which is only supported by the M32Rx processor, and the @samp{-m32rx}
command line flag has not been specified to allow assembly of such
command line flag has not been specified to allow assembly of such
instructions.
instructions.
 
 
@item unknown instruction @samp{...}
@item unknown instruction @samp{...}
This message is produced when the assembler encounters an instruction
This message is produced when the assembler encounters an instruction
which it does not recognize.
which it does not recognize.
 
 
@item only the NOP instruction can be issued in parallel on the m32r
@item only the NOP instruction can be issued in parallel on the m32r
This message is produced when the assembler encounters a parallel
This message is produced when the assembler encounters a parallel
instruction which does not involve a NOP instruction and the
instruction which does not involve a NOP instruction and the
@samp{-m32rx} command line flag has not been specified.  Only the M32Rx
@samp{-m32rx} command line flag has not been specified.  Only the M32Rx
processor is able to execute two instructions in parallel.
processor is able to execute two instructions in parallel.
 
 
@item instruction @samp{...} cannot be executed in parallel.
@item instruction @samp{...} cannot be executed in parallel.
This message is produced when the assembler encounters a parallel
This message is produced when the assembler encounters a parallel
instruction which is made up of one or two instructions which cannot be
instruction which is made up of one or two instructions which cannot be
executed in parallel.
executed in parallel.
 
 
@item Instructions share the same execution pipeline
@item Instructions share the same execution pipeline
This message is produced when the assembler encounters a parallel
This message is produced when the assembler encounters a parallel
instruction whoes components both use the same execution pipeline.
instruction whoes components both use the same execution pipeline.
 
 
@item Instructions write to the same destination register.
@item Instructions write to the same destination register.
This message is produced when the assembler encounters a parallel
This message is produced when the assembler encounters a parallel
instruction where both components attempt to modify the same register.
instruction where both components attempt to modify the same register.
For example these code fragments will produce this message:
For example these code fragments will produce this message:
@samp{mv r1, r2 || neg r1, r3}
@samp{mv r1, r2 || neg r1, r3}
@samp{jl r0 || mv r14, r1}
@samp{jl r0 || mv r14, r1}
@samp{st r2, @@-r1 || mv r1, r3}
@samp{st r2, @@-r1 || mv r1, r3}
@samp{mv r1, r2 || ld r0, @@r1+}
@samp{mv r1, r2 || ld r0, @@r1+}
@samp{cmp r1, r2 || addx r3, r4} (Both write to the condition bit)
@samp{cmp r1, r2 || addx r3, r4} (Both write to the condition bit)
 
 
@end table
@end table
 
 

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