| Line 176... |
Line 176... |
@cindex statistics, register over time
|
@cindex statistics, register over time
|
@cindex register over time statistics
|
@cindex register over time statistics
|
If enabled, this option allows statistics to be collected to analyse
|
If enabled, this option allows statistics to be collected to analyse
|
register access over time. The default is for this to be disabled.
|
register access over time. The default is for this to be disabled.
|
|
|
@item --enable-arith-flag
|
|
@cindex @code{--enable-arith-flag}
|
|
@itemx --disable-arith-flag
|
|
@cindex @code{--disable-arith-flag}
|
|
@cindex flag setting by instructions
|
|
If enabled, this option causes instructions to set the flag (@code{F} bit) in
|
|
the supervision register. The instructions affected by this are @code{l.add},
|
|
@code{l.addc}, @code{l.addi}, @code{l.and} and @code{l.andi}.
|
|
|
|
The default is for this to be disabled.
|
|
|
|
@quotation Caution
|
|
As with @code{--enable-ov-flag}, this appears another very dangerous option,
|
|
to the extent of arguably being a bug. It also appears to be only partially
|
|
implemented---why only the instructions early in the alphabet?
|
|
|
|
Whether or not flags are set is part of the OpenRISC 1000 architectural
|
|
specification. The only flags which should set this are the ``set flag''
|
|
instructions: @code{l.sfeq}, @code{l.sfeqi}, @code{l.sfges}, @code{l.sfgesi},
|
|
@code{l.sfgeu}, @code{l.sfgeui}, @code{l.sfgts}, @code{l.sfgtsi},
|
|
@code{l.sfgtu}, @code{l.sfgtui}, @code{l.sfles}, @code{l.sflesi},
|
|
@code{l.sfleu}, @code{l.sfleui}, @code{l.sflts}, @code{l.sfltsi},
|
|
@code{l.sfltu}, @code{l.sfltui}, @code{l.sfne} and @code{l.sfnei}.
|
|
|
|
The flags are correctly set (irrespective of @code{--enable-arith_flag}).
|
|
|
|
Correct behavior is thus achieved if this flag is not set.
|
|
@code{--enable-arith-flag} should never be used.
|
|
|
|
@end quotation
|
|
|
|
@item --enable-debug
|
@item --enable-debug
|
@cindex @code{--enable-debug}
|
@cindex @code{--enable-debug}
|
@itemx --disable-debug
|
@itemx --disable-debug
|
@cindex @code{--disable-debug}
|
@cindex @code{--disable-debug}
|
@cindex debugging enabled (Argtable2)
|
@cindex debugging enabled (Argtable2)
|
| Line 234... |
Line 203... |
get the missing test(s) working.
|
get the missing test(s) working.
|
|
|
@end table
|
@end table
|
|
|
A number of configuration flags have been removed since version 0.3.0,
|
A number of configuration flags have been removed since version 0.3.0,
|
because they led to invalid behavior of Or1ksim. Those removed include
|
because they led to invalid behavior of Or1ksim. Those removed are:
|
|
|
@table @code
|
@table @code
|
|
|
|
@item --enable-arith-flag
|
|
@cindex @code{--enable-arith-flag}
|
|
@itemx --disable-arith-flag
|
|
@cindex @code{--disable-arith-flag}
|
|
@cindex flag setting by instructions
|
|
If enabled, this option caused certain instructions to set the flag
|
|
(@code{F} bit) in the supervision register if the result were zero.
|
|
The instructions affected by this were @code{l.add}, @code{l.addc},
|
|
@code{l.addi}, @code{l.and} and @code{l.andi}.
|
|
|
|
If set, this caused incorrect behavior. Whether or not flags are set is part
|
|
of the OpenRISC 1000 architectural specification. The only flags which
|
|
should set this are the ``set flag'' instructions: @code{l.sfeq},
|
|
@code{l.sfeqi}, @code{l.sfges}, @code{l.sfgesi}, @code{l.sfgeu},
|
|
@code{l.sfgeui}, @code{l.sfgts}, @code{l.sfgtsi}, @code{l.sfgtu},
|
|
@code{l.sfgtui}, @code{l.sfles}, @code{l.sflesi}, @code{l.sfleu},
|
|
@code{l.sfleui}, @code{l.sflts}, @code{l.sfltsi}, @code{l.sfltu},
|
|
@code{l.sfltui}, @code{l.sfne} and @code{l.sfnei}.
|
|
|
@item --enable-ov-flag
|
@item --enable-ov-flag
|
@cindex @code{--enable-ov-flag}
|
@cindex @code{--enable-ov-flag}
|
@itemx --disable-ov-flag
|
@itemx --disable-ov-flag
|
@cindex @code{--disable-ov-flag}
|
@cindex @code{--disable-ov-flag}
|
@cindex overflow flag setting by instructions
|
@cindex overflow flag setting by instructions
|
This flag used to cause certain instructions to set the overflow flag.
|
This flag caused certain instructions to set the overflow flag. If not,
|
If not, those instructions would not set the overflow flat. The
|
those instructions would not set the overflow flat. The instructions
|
instructions affected by this were @code{l.add}, @code{l.addc},
|
affected by this were @code{l.add}, @code{l.addc}, @code{l.addi},
|
@code{l.addi}, @code{l.and}, @code{l.andi}, @code{l.div}, @code{l.divu},
|
@code{l.and}, @code{l.andi}, @code{l.div}, @code{l.divu}, @code{l.mul},
|
@code{l.mul}, @code{l.muli}, @code{l.or}, @code{l.ori}, @code{l.sll},
|
@code{l.muli}, @code{l.or}, @code{l.ori}, @code{l.sll}, @code{l.slli},
|
@code{l.slli}, @code{l.srl}, @code{l.srli}, @code{l.sra}, @code{l.srai},
|
@code{l.srl}, @code{l.srli}, @code{l.sra}, @code{l.srai}, @code{l.sub},
|
@code{l.sub}, @code{l.xor} and @code{l.xori}.
|
@code{l.xor} and @code{l.xori}.
|
|
|
This guaranteed incorrect behavior. The OpenRISC 1000 architecture
|
This guaranteed incorrect behavior. The OpenRISC 1000 architecture
|
specification defines which flags are set by which instructions.
|
specification defines which flags are set by which instructions.
|
|
|
Within the above list, the arithmetic instructions (@code{l.add},
|
Within the above list, the arithmetic instructions (@code{l.add},
|
