New port submission - picoChip
Hariharan
hariharans@picochip.com
Thu Mar 6 12:43:00 GMT 2008
Hello,
Can someone review the new port, please?
Regards
Hari
Hariharan wrote:
> Hello,
> I would like to submit the picoChip port of GCC to be a part of GCC
> mainline. picoChip produces a 16-bit DSP processor which is popular in
> the wireless infrastructure domain. picoArray processors are used by
> over 100 companies including major companies such as Intel, Huawei,
> Airspan, Alcatel-Lucent, ubiquisys and ip.access as key components in
> WiMAX and WCDMA systems.
>
> This port has been in active development and usage in picoChip for the
> last 6 years. Daniel Towner and myself contributed towards this port
> and we will act as the official maintainers of the port.
>
> I believe that we have conformed, by and large, to the "Anatomy of a
> target backend" and the "New port guidelines" on the Gcc mailing list.
> Please let me know if there are any things in the port that needs to
> be changed.
>
> There is a "picoGcc Reference Manual" in
> http://www.picochip.com/downloads/picoGcc_reference_manual.pdf which
> gives an overview of the processor, detailed description of the ISA,
> ABI and assembler directives.
>
> We intend this to be a "C" only port.
>
> Please note that successful build of this port for libgcc depends on
> the earlier bug fix patch that i have submitted.
> http://gcc.gnu.org/ml/gcc-patches/2008-02/msg00574.html
>
> Regards
> Hari
>
> Attachments :
> patch_file : patch relative to gcc.4.3 mainline sources.
> t-picochip : This file needs to go to libgcc/config under a new
> directory called "picochip". This seems to be the new way of doing
> things for libgcc.
> picochip.tgz : This is the actual port. It needs to go in gcc/config.
>
>
>
>
> ------------------------------------------------------------------------
>
> Index: libgcc/config.host
> ===================================================================
> --- libgcc/config.host (revision 132093)
> +++ libgcc/config.host (working copy)
> @@ -464,6 +464,8 @@
> ;;
> mt-*-elf)
> ;;
> +picochip-*-*)
> + ;;
> pdp11-*-bsd)
> ;;
> pdp11-*-*)
> Index: gcc/doc/extend.texi
> ===================================================================
> --- gcc/doc/extend.texi (revision 132093)
> +++ gcc/doc/extend.texi (working copy)
> @@ -6695,6 +6695,7 @@
> * X86 Built-in Functions::
> * MIPS DSP Built-in Functions::
> * MIPS Paired-Single Support::
> +* picoChip Built-in Functions::
> * PowerPC AltiVec Built-in Functions::
> * SPARC VIS Built-in Functions::
> * SPU Built-in Functions::
> @@ -8812,6 +8813,42 @@
> @end smallexample
> @end table
>
> +@node picoChip Built-in Functions
> +@subsection picoChip Built-in Functions
> +
> +GCC provides an interface to selected machine instructions from the
> +picoChip instruction set.
> +
> +@table @code
> +@item int __builtin_sbc (int @var{value})
> +Sign bit count. Return the number of consecutive bits in @var{value}
> +which have the same value as the sign-bit. The result is the number of
> +leading sign bits minus one, giving the number of redundant sign bits in
> +@var{value}.
> +
> +@item int __builtin_byteswap (int @var{value})
> +Byte swap. Return the result of swapping the upper and lower bytes of
> +@var{value}.
> +
> +@item int __builtin_brev (int @var{value})
> +Bit reversal. Return the result of reversing the bits in
> +@var{value}. Bit 15 is swapped with bit 0, bit 14 is swapped with bit 1,
> +and so on.
> +
> +@item int __builtin_adds (int @var{x}, int @var{y})
> +Saturating addition. Return the result of adding @var{x} and @var{y},
> +storing the value 32767 if the result overflows.
> +
> +@item int __builtin_subs (int @var{x}, int @var{y})
> +Saturating subtraction. Return the result of subtracting @var{y} from
> +@var{x}, storing the value -32768 if the the result overflows.
> +
> +@item void __builtin_halt (void)
> +Halt. The processor will stop execution. This built-in is useful for
> +implementing assertions.
> +
> +@end table
> +
> @node PowerPC AltiVec Built-in Functions
> @subsection PowerPC AltiVec Built-in Functions
>
> Index: gcc/doc/invoke.texi
> ===================================================================
> --- gcc/doc/invoke.texi (revision 132093)
> +++ gcc/doc/invoke.texi (working copy)
> @@ -674,6 +674,10 @@
> -mbranch-expensive -mbranch-cheap @gol
> -msplit -mno-split -munix-asm -mdec-asm}
>
> +@emph{picoChip Options}
> +@gccoptlist{-mae=@var{ae_type} -mvliw-lookahead=@var{N}
> +-msymbol-as-address -mno-inefficient-warnings}
> +
> @emph{PowerPC Options}
> See RS/6000 and PowerPC Options.
>
> @@ -8233,6 +8237,7 @@
> * MN10300 Options::
> * MT Options::
> * PDP-11 Options::
> +* picoChip Options::
> * PowerPC Options::
> * RS/6000 and PowerPC Options::
> * S/390 and zSeries Options::
> @@ -12641,6 +12646,54 @@
> PDP-11 target other than @samp{pdp11-*-bsd}.
> @end table
>
> +@node picoChip Options
> +@subsection picoChip Options
> +@cindex picoChip options
> +
> +These @samp{-m} options are defined for picoChip implementations:
> +
> +@table @gcctabopt
> +
> +@item -mae=@var{ae_type}
> +@opindex mcpu
> +Set the instruction set, register set, and instruction scheduling
> +parameters for array element type @var{ae_type}. Supported values
> +for @var{ae_type} are @samp{ANY}, @samp{MUL}, and @samp{MAC}.
> +
> +@option{-mae=ANY} selects a completely generic AE type. Code
> +generated with this option will run on any of the other AE types. The
> +code will not be as efficient as it would be if compiled for a specific
> +AE type, and some types of operation (e.g., multiplication) will not
> +work properly on all types of AE.
> +
> +@option{-mae=MUL} selects a MUL AE type. This is the most useful AE type
> +for copiled code, and is the default.
> +
> +@option{-mae=MAC} selects a DSP-style MAC AE. Code compiled with this
> +option may suffer from poor performance of byte (char) manipulation,
> +since the DSP AE does not provide hardware support for byte load/stores.
> +
> +@item -msymbol-as-address
> +Enable the compiler to directly use a symbol name as an address in a
> +load/store instruction, without first loading it into a
> +register. Typically, the use of this option will generate larger
> +programs, which run faster than when the option isn't used. However, the
> +results vary from program to program, so it is left as a user option,
> +rather than being permanently enabled.
> +
> +@item -mno-inefficient-warnings
> +Disables warnings about the generation of inefficient code. These
> +warnings can be generated, for example, when compiling code which
> +performs byte-level memory operations on the MAC AE type. The MAC AE has
> +no hardware support for byte-level memory operations, so all byte
> +load/stores must be synthesised from word load/store operations. This is
> +inefficient and a warning will be generated indicating to the programmer
> +that they should rewrite the code to avoid byte operations, or to target
> +an AE type which has the necessary hardware support. This option enables
> +the warning to be turned off.
> +
> +@end table
> +
> @node PowerPC Options
> @subsection PowerPC Options
> @cindex PowerPC options
> Index: gcc/doc/contrib.texi
> ===================================================================
> --- gcc/doc/contrib.texi (revision 132093)
> +++ gcc/doc/contrib.texi (working copy)
> @@ -917,6 +917,10 @@
> Leonard Tower wrote parts of the parser, RTL generator, and RTL
> definitions, and of the VAX machine description.
>
> +@item
> +Daniel Towner and Hariharan Sandanagobalane contributed and
> +maintain the picoChip port.
> +
> @item
> Tom Tromey for internationalization support and for his many Java
> contributions and libgcj maintainership.
> Index: gcc/doc/md.texi
> ===================================================================
> --- gcc/doc/md.texi (revision 132093)
> +++ gcc/doc/md.texi (working copy)
> @@ -1852,6 +1852,46 @@
> A register indirect memory operand
> @end table
>
> +@item picoChip family---@file{picochip.h}
> +@table @code
> +@item k
> +Stack register.
> +
> +@item f
> +Pointer register. A register which can be used to access memory without
> +supplying an offset. Any other register can be used to access memory,
> +but will need a constant offset. In the case of the offset being zero,
> +it is more efficient to use a pointer register, since this reduces code
> +size.
> +
> +@item t
> +A twin register. A register which may be paired with an adjacent
> +register to create a 32-bit register.
> +
> +@item a
> +Any absolute memory address (e.g., symbolic constant, symbolic
> +constant + offset).
> +
> +@item I
> +4-bit signed integer.
> +
> +@item J
> +4-bit unsigned integer.
> +
> +@item K
> +8-bit signed integer.
> +
> +@item M
> +Any constant whose absolute value is no greater than 4-bits.
> +
> +@item N
> +10-bit signed integer
> +
> +@item O
> +16-bit signed integer.
> +
> +@end table
> +
> @item PowerPC and IBM RS6000---@file{config/rs6000/rs6000.h}
> @table @code
> @item b
> Index: gcc/config.gcc
> ===================================================================
> --- gcc/config.gcc (revision 132093)
> +++ gcc/config.gcc (working copy)
> @@ -339,6 +339,9 @@
> cpu_type=mips
> need_64bit_hwint=yes
> ;;
> +picochip-*-*)
> + cpu_type=picochip
> + ;;
> powerpc*-*-*)
> cpu_type=rs6000
> extra_headers="ppc-asm.h altivec.h spe.h ppu_intrinsics.h paired.h spu2vmx.h vec_types.h si2vmx.h"
> @@ -1841,6 +1844,9 @@
> pdp11-*-*)
> use_fixproto=yes
> ;;
> +picochip-*)
> + # Nothing special
> + ;;
> # port not yet contributed
> #powerpc-*-openbsd*)
> # tmake_file="${tmake_file} rs6000/t-fprules rs6000/t-fprules-fpbit "
>
> ------------------------------------------------------------------------
>
> # Compile the extra library functions.
>
> LIB2FUNCS_EXTRA = \
> $(srcdir)/config/picochip/libgccExtras/ashrsi3.asm \
> $(srcdir)/config/picochip/libgccExtras/ashlsi3.asm \
> $(srcdir)/config/picochip/libgccExtras/divmodhi4.asm \
> $(srcdir)/config/picochip/libgccExtras/udivmodhi4.asm \
> $(srcdir)/config/picochip/libgccExtras/divmodsi4.asm \
> $(srcdir)/config/picochip/libgccExtras/udivmodsi4.asm \
> $(srcdir)/config/picochip/libgccExtras/divmod15.asm \
> $(srcdir)/config/picochip/libgccExtras/ucmpsi2.asm \
> $(srcdir)/config/picochip/libgccExtras/cmpsi2.asm \
> $(srcdir)/config/picochip/libgccExtras/clz32.asm \
> $(srcdir)/config/picochip/libgccExtras/adddi3.asm \
> $(srcdir)/config/picochip/libgccExtras/subdi3.asm \
> $(srcdir)/config/picochip/libgccExtras/lshrsi3.asm \
> $(srcdir)/config/picochip/libgccExtras/parityhi2.asm \
> $(srcdir)/config/picochip/libgccExtras/popcounthi2.asm
>
> # Prevent some of the more complicated libgcc functions from being
> # compiled. This is because they are generally too big to fit into an
> # AE anyway, so there is no point in having them. Also, some don't
> # compile properly so we'll ignore them for the moment.
>
> LIB1ASMFUNCS = _mulsc3 _divsc3
> LIB1ASMSRC = picochip/libgccExtras/fake_libgcc.asm
>
> # Turn off the building of exception handling libraries.
> LIB2ADDEH =
> LIB2ADDEHDEP =
>
> # Turn off ranlib on target libraries.
> RANLIB_FOR_TARGET = cat
>
> # Special libgcc setup. Make single/double floating point the same,
> # and use our own include files.
> TARGET_LIBGCC2_CFLAGS = -DDF=SF -I../../includes/
>
> # Switch off all debugging for the embedded libraries.
> # (embedded processors need small libraries by default).
> # NOTE: If the debug level is increased, turn off instruction scheduling.
> LIBGCC2_DEBUG_CFLAGS = -g0
>
> # Build all combinations of library for different multiply units, and
> # presence/absence of byte access.
> MULTILIB_OPTIONS = mmul-type=none/mmul-type=mac/mmul-type=mul mno-byte-access/mbyte-access
>
> # Using a mul unit (currently) implies that byte access is available.
> MULTILIB_EXCEPTIONS = mmul-type=mul/mno-byte-access
>
> # We want fine grained libraries, so use the new code
> # to build the floating point emulation libraries.
> FPBIT = fp-bit.c
>
> # Software floating point support. Floating point is not properly
> # supported, but is existence can be useful for some types of testing.
> fp-bit.c: $(srcdir)/config/fp-bit.c
> echo '#define FLOAT' > fp-bit.c
> echo '#define FLOAT_ONLY' >> fp-bit.c
> echo '#define SMALL_MACHINE' >> fp-bit.c
> cat $(srcdir)/config/fp-bit.c >> fp-bit.c
>
>
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