| 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-ov-flag
|
|
@cindex @code{--enable-ov-flag}
|
|
@itemx --disable-ov-flag
|
|
@cindex @code{--disable-ov-flag}
|
|
@cindex overflow flag setting by instructions
|
|
If enabled, this option causes instructions to set the overflow
|
|
flag. The instructions affected by this are @code{l.add},
|
|
@code{l.addc}, @code{l.addi}, @code{l.and}, @code{l.andi},
|
|
@code{l.div}, @code{l.divu}, @code{l.mul}, @code{l.muli}, @code{l.or},
|
|
@code{l.ori}, @code{l.sll}, @code{l.slli}, @code{l.srl},
|
|
@code{l.srli}, @code{l.sra}, @code{l.srai}, @code{l.sub}, @code{l.xor}
|
|
and @code{l.xori}.
|
|
|
|
The default is for this to be disabled.
|
|
|
|
@quotation Caution
|
|
This appears a very dangerous option, to the extent of arguably being
|
|
a bug. Whether or not flags are set is part of the OpenRISC 1000
|
|
architectural specification. Within the above list, the arithmetic
|
|
instructions (@code{l.add}, @code{l.addc}, @code{l.addi},
|
|
@code{l.div}, @code{l.divu}, @code{l.mul}, @code{l.muli} and
|
|
@code{l.sub}), together with @code{l.addic} which is missed out, set
|
|
the overflow flag. All the others (@code{l.and}, @code{l.andi},
|
|
@code{l.or}, @code{l.ori}, @code{l.sll}, @code{l.slli}, @code{l.srl},
|
|
@code{l.srli}, @code{l.sra}, @code{l.srai}, @code{l.xor} and
|
|
@code{l.xori}) do not.
|
|
|
|
Thus it is impossible to get correct behavior whichever way this option is
|
|
set.
|
|
@end quotation
|
|
|
|
@item --enable-arith-flag
|
@item --enable-arith-flag
|
@cindex @code{--enable-arith-flag}
|
@cindex @code{--enable-arith-flag}
|
@itemx --disable-arith-flag
|
@itemx --disable-arith-flag
|
@cindex @code{--disable-arith-flag}
|
@cindex @code{--disable-arith-flag}
|
@cindex flag setting by instructions
|
@cindex flag setting by instructions
|
| Line 264... |
Line 233... |
This flag is intended for those working on the test package, who wish to
|
This flag is intended for those working on the test package, who wish to
|
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,
|
|
because they led to invalid behavior of Or1ksim. Those removed include
|
|
|
|
@table @code
|
|
|
|
@item --enable-ov-flag
|
|
@cindex @code{--enable-ov-flag}
|
|
@itemx --disable-ov-flag
|
|
@cindex @code{--disable-ov-flag}
|
|
@cindex overflow flag setting by instructions
|
|
This flag used to cause certain instructions to set the overflow flag.
|
|
If not, those instructions would not set the overflow flat. The
|
|
instructions affected by this were @code{l.add}, @code{l.addc},
|
|
@code{l.addi}, @code{l.and}, @code{l.andi}, @code{l.div}, @code{l.divu},
|
|
@code{l.mul}, @code{l.muli}, @code{l.or}, @code{l.ori}, @code{l.sll},
|
|
@code{l.slli}, @code{l.srl}, @code{l.srli}, @code{l.sra}, @code{l.srai},
|
|
@code{l.sub}, @code{l.xor} and @code{l.xori}.
|
|
|
|
This guaranteed incorrect behavior. The OpenRISC 1000 architecture
|
|
specification defines which flags are set by which instructions.
|
|
|
|
Within the above list, the arithmetic instructions (@code{l.add},
|
|
@code{l.addc}, @code{l.addi}, @code{l.div}, @code{l.divu}, @code{l.mul},
|
|
@code{l.muli} and @code{l.sub}), together with @code{l.addic} which is
|
|
missed out, set the overflow flag. All the others (@code{l.and},
|
|
@code{l.andi}, @code{l.or}, @code{l.ori}, @code{l.sll}, @code{l.slli},
|
|
@code{l.srl}, @code{l.srli}, @code{l.sra}, @code{l.srai}, @code{l.xor}
|
|
and @code{l.xori}) do not.
|
|
|
|
@end table
|
|
|
@node Build and Install
|
@node Build and Install
|
@section Building and Installing
|
@section Building and Installing
|
Build the tool with:
|
Build the tool with:
|
|
|
@example
|
@example
|
