[m68k] ABCD and SBCD instructions not recognized

[JoaoBaptMG]

When trying to compile code for the m68k platform that uses the abcd and sbcd instructions:

int abcd(unsigned char a, unsigned char b)
{
    asm("abcd %1, %0" : "+r"(a) : "r"(b));
    return a;
}

int sbcd(unsigned char a, unsigned char b)
{
    asm("sbcd %1, %0" : "+r"(a) : "r"(b));
    return a;
}

clang fails with the following error:

abcd-sbcd.c:3:9: error: unexpected token parsing operands
    3 |     asm("abcd %1, %0" : "+r"(a) : "r"(b));
      |         ^
<inline asm>:1:7: note: instantiated into assembly here
    1 |         abcd %d0, %d1
      |              ^
abcd-sbcd.c:9:9: error: unexpected token parsing operands
    9 |     asm("sbcd %1, %0" : "+r"(a) : "r"(b));
      |         ^
<inline asm>:1:7: note: instantiated into assembly here
    1 |         sbcd %d0, %d1
      |              ^
2 errors generated.

This is a code generator problem, since LLVM is correctly emitted, and the error also appears on Rust. I am attaching a .zip file containing the .c file I tried to compile, the .bc file generated by clang -Wall -O3 -target=m68k --emit-llvm -c -o <file> and the reductions made by bugpoint: llvm-m68k-abcd-sbcd-bug.zip

[llvmbot]

@llvm/issue-subscribers-backend-m68k

Author: João Baptista de Paula e Silva (JoaoBaptMG)

Details

When trying to compile code for the `m68k` platform that uses the `abcd` and `sbcd` instructions: ```c int abcd(unsigned char a, unsigned char b) { asm("abcd %1, %0" : "+r"(a) : "r"(b)); return a; }

int sbcd(unsigned char a, unsigned char b)
{
asm("sbcd %1, %0" : "+r"(a) : "r"(b));
return a;
}

`clang` fails with the following error:

abcd-sbcd.c:3:9: error: unexpected token parsing operands
3 | asm("abcd %1, %0" : "+r"(a) : "r"(b));
| ^
<inline asm>:1:7: note: instantiated into assembly here
1 | abcd %d0, %d1
| ^
abcd-sbcd.c:9:9: error: unexpected token parsing operands
9 | asm("sbcd %1, %0" : "+r"(a) : "r"(b));
| ^
<inline asm>:1:7: note: instantiated into assembly here
1 | sbcd %d0, %d1
| ^
2 errors generated.

This is a code generator problem, since LLVM is correctly emitted, and the error also appears on Rust. I am attaching a `.zip` file containing the `.c` file I tried to compile, the `.bc` file generated by `clang -Wall -O3 -target=m68k --emit-llvm -c -o <file>` and the reductions made by `bugpoint`: [llvm-m68k-abcd-sbcd-bug.zip](https://github.com/user-attachments/files/24417469/llvm-m68k-abcd-sbcd-bug.zip)
</details>

[JoaoBaptMG]

It seems that the MOVEP instruction is also missing:

void movep(char* dest, int k) 
{
    asm("movep %1, %0" : "=m"(*dest) : "r"(k), "a"(dest));
}

makes clang complain with:

abcd-sbcd.c:15:9: error: unexpected token parsing operands
   15 |     asm("movep %1, %0" : "=m"(*dest) : "r"(k), "a"(dest));
      |         ^
<inline asm>:1:8: note: instantiated into assembly here
    1 |         movep %d0, (%a0)
      |               ^

Should I regenerate the files to show?