[meta] 确保Spike能够运行起来rvv小队开发的 rvv-llvm 在 plct-spike 上的运行

[lazyparser]

[meta] 确保Spike能够运行起来rvv小队开发的 rvv-llvm 在 plct-spike 上的运行

[xingmingjie]

目前使用spike官方仓库构建的版本，尚不支持最新RVV指令。

对于如下代码片段：

riscv64-unknown-elf-objdump -d a.out >& a.dump

0000000000010250 <loop>:
   10250:       0c3672d7                vsetvli t0,a2,e8,m8,ta,ma,d1
   10254:       02058007                vle8.v  v0,(a1)
   10258:       005585b3                add     a1,a1,t0
   1025c:       40560633                sub     a2,a2,t0
   10260:       02068027                vse8.v  v0,(a3)
   10264:       005686b3                add     a3,a3,t0
   10268:       fe0614e3                bnez    a2,10250 <loop>
   1026c:       00008067                ret

运行spike，会报trap_illegal_instruction错误：

spike -l pk a.out >& run.log

core   0: 0x0000000000010250 (0x0c3672d7) vsetvli t0, a2, e8, m8, ta, ma
core   0: exception trap_illegal_instruction, epc 0x0000000000010250
core   0:           tval 0x0000000000000000
core   0: 0x0000000080000004 (0x34011173) csrrw   sp, mscratch, sp
core   0: 0x0000000080000008 (0x1a010863) beqz    sp, pc + 432

官方有类似问题的issue：riscv-software-src#424

[lazyparser]

收到❤️

[xingmingjie]

问题已解决。

需要用 --isa=rv64gcv 来指定spike支持rvv，现在来看是支持rvv最新指令了。

$ spike --isa=rv64gcv pk test-memcpy
bbl loader
Hello World!

[nihui]

问题已解决。

需要用 --isa=rv64gcv 来指定spike支持rvv，现在来看是支持rvv最新指令了。

$ spike --isa=rv64gcv pk test-memcpy
bbl loader
Hello World!

请教下，如何解决 illegal instruction，加了 --isa=rv64gcv 还是有这个错误
pk 和 spike 都已经是 git 最新版本了

#include <stdio.h>

int main()
{
    fprintf(stderr, "hello\n");

    asm volatile(
        "vle8.v v0, (a1)"
        :
        :
        :
    );

    fprintf(stderr, "moew\n");

    return 0;
}

riscv64-unknown-elf-gcc hello.c -o hello

spike --isa=rv64gcv /opt/riscv/riscv64-unknown-elf/bin/pk ./hello

bbl loader
hello
z  0000000000000000 ra 000000000001016e sp 000000007f7e9b40 gp 0000000000013d60
tp 0000000000000000 t0 00000000000102d4 t1 000000000000000f t2 0000000000000000
s0 000000007f7e9b50 s1 0000000000000000 a0 0000000000000006 a1 0000000000012518
a2 0000000000000006 a3 0000000000000000 a4 0000000000000000 a5 0000000000000006
a6 000000000000001f a7 0000000000000040 s2 0000000000000000 s3 0000000000000000
s4 0000000000000000 s5 0000000000000000 s6 0000000000000000 s7 0000000000000000
s8 0000000000000000 s9 0000000000000000 sA 0000000000000000 sB 0000000000000000
t3 0000000000000000 t4 0000000000000000 t5 0000000000000000 t6 0000000000000000
pc 000000000001016e va 0000000002058007 insn       02058007 sr 8000000200046620
An illegal instruction was executed!

工具链编译过程如下

sudo apt-get install autoconf automake autotools-dev curl python3 libmpc-dev libmpfr-dev libgmp-dev gawk build-essential bison flex texinfo gperf libtool patchutils bc zlib1g-dev libexpat-dev


export PATH=/opt/riscv/bin:$PATH

# riscv-gnu-toolchain
git clone https://github.com/riscv/riscv-gnu-toolchain.git
cd riscv-gnu-toolchain
# 0.8.x = 07607e1720113e34b1fe6fd8bbb4842d42e591bf
# 0.9.x = 5842fde8ee5bb3371643b60ed34906eff7a5fa31
git checkout 5842fde8ee5bb3371643b60ed34906eff7a5fa31
git submodule update --init

# undefined reference to __math_oflowf
sed -i '/__OBSOLETE_MATH/d' riscv-gnu-toolchain/riscv-newlib/newlib/libm/common/math_errf.c

# rv64imafdc
# rv64imafdcv
./configure --prefix=/opt/riscv --with-arch=rv64gcv
make -j2

# riscv-pk
git clone https://github.com/riscv/riscv-pk.git
cd riscv-pk
git submodule update --init

mkdir build
cd build
../configure --prefix=/opt/riscv --with-arch=rv64gcv --host=riscv64-unknown-elf
make -j2
make install


# riscv-isa-sim
sudo apt-get install device-tree-compiler

git clone https://github.com/riscv/riscv-isa-sim.git
cd riscv-isa-sim
git submodule update --init

mkdir build
cd build
../configure --prefix=/opt/riscv --with-isa=rv64gcv
make -j2
make install

[mengls666]

@nihui

#include <stdio.h>

int main()
{
	    fprintf(stderr, "hello\n");
            asm volatile("vsetvli t0,a2,e8,m8,ta,ma,d1"); 
            asm volatile("vle8.v v0, (a1)");
            fprintf(stderr, "moew\n");

            return 0;
}

运行正常，希望对你有帮助

[nihui]

@nihui

#include <stdio.h>

int main()
{
	    fprintf(stderr, "hello\n");
            asm volatile("vsetvli t0,a2,e8,m8,ta,ma,d1"); 
            asm volatile("vle8.v v0, (a1)");
            fprintf(stderr, "moew\n");

            return 0;
}

运行正常，希望对你有帮助

成功了！谢谢大佬！！

[nihui]

我把ncnn移植好了，简单的simd也可以跑了，感谢！

[lazyparser]

我把ncnn移植好了，简单的simd也可以跑了，感谢！

good news 🎉