Are P* extensions supported ?

[manju1205]

I am getting below error ::

Assembler messages:
Error: cannot find default versions of the ISA extension p' /tmp/ccKNSLNd.s:3: Error: cannot find default versions of the ISA extension p'

I have used below build commands::

./configure --prefix=$RISCV --with-arch=rv32gp --with-abi=ilp32
make

[TommyMurphyTM1234]

I'm not sure if anything has changed since this?

• Compiling P-ext instructions #1190

[kito-cheng]

Not supported, this repo are using upstream GNU toolchain source tree, and upstream GNU toolchain not supported yet since it never get ratified, but you could use external GCC and binutils source tree from PLCT or Andes https://github.com/andestech/gcc.

[TommyMurphyTM1234]

I'm not sure if anything has changed since this?

• Compiling P-ext instructions #1190

In case it helps this worked for me:

git clone https://github.com/riscv-collab/riscv-gnu-toolchain issue-1291
cd issue-1291
git clone https://github.com/plctlab/riscv-gcc -b riscv-gcc-p-ext riscv-gcc-p-ext
git clone https://github.com/plctlab/riscv-binutils-gdb -b riscv-binutils-p-ext riscv-binutils-p-ext
./configure --prefix=`pwd`/installed-tools --with-arch=rv64imafd_zpn --with-abi=lp64d --with-gcc-src=`pwd`/riscv-gcc-p-ext --with-binutils-src=`pwd`/riscv-binutils-p-ext
make

And I was able to compile and disassemble the simple example code here:

• Compiling P-ext instructions #1190 (comment)

[TommyMurphyTM1234]

Closing the issue since P extension support will be available when (a) the specification is ratified and (b) support is upstreamed to the master GCC and binutils projects.

[manju1205]

Hi,
I could compile the toolchain successfully.
I could run below command and generate only intermediate files with lot of warnings.
riscv64-unknown-elf-gcc -O2 test.c -save-temps -o Test

test.s, test.i, test.o are generated but not the output file "Test"

I am able to see objdump showing all the P-ext instructions. :: riscv64-unknown-elf-objdump -d test.o

Why I am getting below warnings and why output file is not generated?
Since there are no errors I am not sure how to proceed further.

I am seeing below warnings on compilation.

/home/manjub/work/riscv_install/riscvtools/lib/gcc/riscv64-unknown-elf/10.2.0/../../../../riscv64-unknown-elf/bin/ld: warning: /home/manjub/work/riscv_install/riscvtools/lib/gcc/riscv64-unknown-elf/10.2.0/../../../../riscv64-unknown-elf/lib/libc.a(lib_a-errno.o): mis-matched ISA version 2.0 for 'f' extension, the output version is 2.2
/home/manjub/work/riscv_install/riscvtools/lib/gcc/riscv64-unknown-elf/10.2.0/../../../../riscv64-unknown-elf/bin/ld: warning: /home/manjub/work/riscv_install/riscvtools/lib/gcc/riscv64-unknown-elf/10.2.0/../../../../riscv64-unknown-elf/lib/libc.a(lib_a-errno.o): mis-matched ISA version 2.0 for 'd' extension, the output version is 2.2
/home/manjub/work/riscv_install/riscvtools/lib/gcc/riscv64-unknown-elf/10.2.0/../../../../riscv64-unknown-elf/bin/ld: warning: /home/manjub/work/riscv_install/riscvtools/lib/gcc/riscv64-unknown-elf/10.2.0/crtend.o: mis-matched ISA version 2.0 for 'i' extension, the output version is 2.1
/home/manjub/work/riscv_install/riscvtools/lib/gcc/riscv64-unknown-elf/10.2.0/../../../../riscv64-unknown-elf/bin/ld: warning: /home/manjub/work/riscv_install/riscvtools/lib/gcc/riscv64-unknown-elf/10.2.0/crtend.o: mis-matched ISA version 2.0 for 'a' extension, the output version is 2.1
/home/manjub/work/riscv_install/riscvtools/lib/gcc/riscv64-unknown-elf/10.2.0/../../../../riscv64-unknown-elf/bin/ld: warning: /home/manjub/work/riscv_install/riscvtools/lib/gcc/riscv64-unknown-elf/10.2.0/crtend.o: mis-matched ISA version 2.0 for 'f' extension, the output version is 2.2
/home/manjub/work/riscv_install/riscvtools/lib/gcc/riscv64-unknown-elf/10.2.0/../../../../riscv64-unknown-elf/bin/ld: warning: /home/manjub/work/riscv_install/riscvtools/lib/gcc/riscv64-unknown-elf/10.2.0/crtend.o: mis-matched ISA version 2.0 for 'd' extension, the output version is 2.2

[TommyMurphyTM1234]

Please clarify and provide...

1. Details of how you're building your toolchain
2. Your example code and details of how you're compiling it - ideally a small self-contained source file and associated Makefile

[manju1205]

My sincere apologies. Test output is generated, "ll" command was not listing it.
I am getting below error with spike simulator ::
spike pk Test
error: bad --isa option 'rv64imafd_zpn'. unsupported extension: zpn

Please suggest me how to add "zpn" to spike?

[TommyMurphyTM1234]

My sincere apologies. Test output is generated, "ll" command was not listing it.

Do you mean that your previous post can be ignored after all?

I am getting below error with spike simulator :: spike pk Test error: bad --isa option 'rv64imafd_zpn'. unsupported extension: zpn

I suspect that Spike only supports ratified extensions.
Certainly Zp* is not listed here and I don't see any branch that might be prototyping support:

• https://github.com/riscv-software-src/riscv-isa-sim

I don't know if the PLCT fork of Spike might support Zp* like their GCC and binutils forks?

• https://github.com/plctlab/plct-spike

If not and there is no other Spike fork that implements Zp* support then you'll probably have to ask over at the Spike repo or on the RISC-V mailing lists about how to approach implementing support yourself:

• https://github.com/riscv-software-src/riscv-isa-sim
• https://lists.riscv.org/g/main

[manju1205]

yes, my post wrt output not generated can be ignored.
"P extension, v0.9.2" is listed among supported ISA in https://github.com/riscv-software-src/riscv-isa-sim.
If not spike can I try any other simulator?

[TommyMurphyTM1234]

"P extension, v0.9.2" is listed among supported ISA in https://github.com/riscv-software-src/riscv-isa-sim.

You'll have to ask about this and why your attempt to use it fails over at the Spike and/or P extension pages:

• https://github.com/riscv-software-src/riscv-isa-sim
• https://github.com/riscv/riscv-p-spec

If not spike can I try any other simulator?

Sorry - I've no idea myself.
Maybe check with some of the other RISC-V simulator projects to see if they offer what you're looking for?

• https://michaeljclark.github.io/software.html

[TommyMurphyTM1234]

Looks to me like Zpn should be supported by Spike:

• https://github.com/riscv-software-src/riscv-isa-sim/blob/ed5dccb2911f3b2dda731e5fe65e6c03ad0b46fb/riscv/isa_parser.cc#L74

How exactly did you build it?
Maybe you need to pass the requested ISA string in a different form to Spike?

[TommyMurphyTM1234]

I am getting below error with spike simulator ::

spike pk Test 
error: bad --isa option 'rv64imafd_zpn'. unsupported extension: zpn

Please suggest me how to add "zpn" to spike?

Looks like you need to do this:

spike --isa=rv64imafdp ...

Enabling the P extension enables a set of "sub-"extensions including ZPn as per the table here:

• https://wiki.riscv.org/display/HOME/Specification+Status#:~:text=Jira%20Link-,Packed%20SIMD%C2%A0,-Zbpbo%2C%20Zpn%2C%20Zpsfoperand

This is the relevant Spike code:

• https://github.com/riscv-software-src/riscv-isa-sim/blob/ed5dccb2911f3b2dda731e5fe65e6c03ad0b46fb/riscv/isa_parser.cc#L74

    switch (*p) {
      case 'p': extension_table[EXT_ZBPBO] = true;
                extension_table[EXT_ZPN] = true;
                extension_table[EXT_ZPSFOPERAND] = true;
                extension_table[EXT_ZMMUL] = true; break;

[manju1205]

Thanks, with "--isa" option I could get spike recognizing the "zpn" sub-ext.
Below branch do they support zbpbo and zpsfoperand extns?

git clone https://github.com/plctlab/riscv-gcc -b riscv-gcc-p-ext riscv-gcc-p-ext
git clone https://github.com/plctlab/riscv-binutils-gdb -b riscv-binutils-p-ext riscv-binutils-p-ext

[TommyMurphyTM1234]

Thanks, with "--isa" option I could get spike recognizing the "zpn" sub-ext.

How? You said earlier that you got this:

error: bad --isa option 'rv64imafd_zpn'. unsupported extension: zpn

Below branch do they support zbpbo and zpsfoperand extns?

Yes - as I said here, if you use --isa=rvXX...p:

• Are P* extensions supported ? #1291 (comment)

[manju1205]

I used to get error on running below command without --isa option::

spike pk Test --- error
spike --isa=rv64imafdp pk Test -- NO error...

[TommyMurphyTM1234]

I used to get error on running below command without --isa option::

spike pk Test --- error spike --isa=rv64imafdp pk Test -- NO error...

Yes, that's basically what I said above:

Yes - as I said here, if you use --isa=rvXX...p:

• Are P* extensions supported ? #1291 (comment)