clang编译rvv intrinsic时出错

[xicongye]

1. 版本描述：

$ cd riscv-gnu-toolchain
$ git branch
* rvv-intrinsic
$ git log -1
commit 1e24571a8c3058a2160f10913e465dfa6f39046d
Merge: 8618434 f6d5752
Author: Kito Cheng <kito.cheng@sifive.com>
Date:   Mon Jan 11 16:35:07 2021 +0800

    Merge pull request #819 from higuoxing/rvv-intrinsic
    
    Specify branch info in .gitmodules.
$ cd rvv-llvm
$ git branch
* rvv-iscas
$ git log -1
Author: Alex <814943412@qq.com>
Date:   Sat Jan 9 23:48:54 2021 +0800

    Add vsetvl instruction for rvv-llvm test cases

2. 构建步骤：

riscv-gnu-toolchain

$ ../configure --with-arch=rv64gcv --with-abi=lp64d

rvv-llvm

$ cmake -DLLVM_TARGETS_TO_BUILD="X86;RISCV" \
           -DLLVM_ENABLE_PROJECTS=clang \
           -DCMAKE_INSTALL_PREFIX=xxx/build/install \
           -DCMAKE_BUILD_TYPE=Release \
           -G "Unix Makefiles" \
           ../llvm

3. 问题复现

main.c源代码：

#include <stdio.h>
#include <riscv_vector.h>

vbool8_t mask_write_vbool8(int64_t * mask_64){
  vint64m8_t mask = vle64_v_i64m8(mask_64);
  vbool8_t result = vmseq_vx_i64m8_b8(mask, 1); 
  return result;
}

void vmacc_vv_NOMASK(){
  int64_t data1_64[16] = {0x8000000000000000,0x7fffffffffffffff,0x8000000000000000,0x7fffffffffffffff,0x8000000000000000,0x7fffffffffffffff};
  int64_t data2_64[16] = {0x01              ,0x01              ,0x01              ,0x01              ,0x01              ,0x01              };  
  int64_t conseq_64[16]= {0xffffffffffffffff,0x01              ,0x8000000000000000,0x7fffffffffffffff,0x00              ,0x00              };  
  int64_t desire_64[16]= {0xffffffffffffffff,0x01              ,0x8000000000000000,0x7fffffffffffffff,0x00              ,0x00              };  
  int64_t mask_64[16]  = {0};
  vsetvl_e64m8(8);
  vint64m8_t acc  = vle64_v_i64m8(conseq_64);                                                                                                         
  vint64m8_t src1 = vle64_v_i64m8(data1_64);
  vint64m8_t src2 = vle64_v_i64m8(data2_64);
  vint64m8_t dst = vmacc_vv_i64m8(acc,src1, src2);
  vse64_v_i64m8(conseq_64, dst);
  for (int i = 0; i < 16; i++)
     printf("dst = %d\n", dst[i]);
}

void vmacc_vv_MASK(){
  int64_t data1_64[16] = {0x8000000000000000,0x7fffffffffffffff,0x8000000000000000,0x7fffffffffffffff,0x8000000000000000,0x7fffffffffffffff};
  int64_t data2_64[16] = {0x01              ,0x01              ,0x01              ,0x01              ,0x01              ,0x01              };  
  int64_t conseq_64[16]= {0xffffffffffffffff,0x01              ,0x8000000000000000,0x7fffffffffffffff,0x00              ,0x00              };  
  int64_t desire_64[16]= {0xffffffffffffffff,0x01              ,0x8000000000000000,0x7fffffffffffffff,0x00              ,0x00              };  
  int64_t mask_64[16]  = {0};
  vsetvl_e64m8(8);
  vsetvl_e64m8(16);
  vint64m8_t zero_64 = vzero_i64m8();
  vint64m8_t acc  = vle64_v_i64m8(conseq_64);
  vint64m8_t src1 = vle64_v_i64m8(data1_64);
  vint64m8_t src2 = vle64_v_i64m8(data2_64);
  vint64m8_t dst = vmacc_vv_i64m8_m(mask_write_vbool8(mask_64), acc, src1, src2); 
  vse64_v_i64m8(conseq_64, dst);
  for (int i = 0; i < 16; i++)
     printf("dst = %d\n", dst[i]);
}

int main(void)
{
  vmacc_vv_NOMASK();
  vmacc_vv_MASK();
}

编译：

$ clang --target=riscv64-unknown-elf -menable-experimental-extensions --sysroot=xxx/riscv-gnu-toolchain/build/install/riscv64-unknown-elf --gcc-toolchain=xxx/riscv-gnu-toolchain/build/install -w -g -march=rv64imafdcv1p0 -mabi=lp64d -mcmodel=medany -o main.elf main.c

报错信息：

fatal error: error in backend: Cannot select: 0x70ca3d0: i64 = extract_vector_elt 0x70b7d98, 0x70b7780, main.c:23:27
  0x70b7d98: nxv8i64,ch = load<(load unknown-size from %ir.9, align 64)> 0x7059878, FrameIndex:i64<8>, undef:i64, main.c:23:27
    0x70ca710: i64 = FrameIndex<8>
    0x70b7b90: i64 = undef
  0x70b7780: i64,ch = load<(dereferenceable load 4 from %ir.10), sext from i32> 0x7059878, FrameIndex:i64<9>, undef:i64, main.c:23:31
    0x70b7f38: i64 = FrameIndex<9>
    0x70b7b90: i64 = undef
In function: vmacc_vv_NOMASK
clang-12: error: clang frontend command failed with exit code 70 (use -v to see invocation)
clang version 12.0.0 (https://github.com/isrc-cas/rvv-llvm.git 6a4eaeb0de7b415bbaedd73f6923a0882dc9ef86)
Target: riscv64-unknown-unknown-elf

[luxufan]

Hi, 目前我们的编译器对dst[0]这样的数组下标访问形式支持得不是很好，不过我们更新了代码，目前vmacc_vv_NOMASK函数可以正常编译执行， 但vmacc_vv_MASK由于缺少一条指令的支持，目前编译不通过，我们后续会添加对这部分指令的支持！