The tracking issue for this feature is: #133416
This tracks support for additional registers in architectures where inline assembly is already stable.
| Architecture | Register class | Registers | LLVM constraint code | 
|---|
| s390x | vreg | v[0-31] | v | 
Notes:
- s390x vregis clobber-only in stable.
| Architecture | Register class | Target feature | Allowed types | 
|---|
| s390x | vreg | vector | i32,f32,i64,f64,i128,f128,i8x16,i16x8,i32x4,i64x2,f32x4,f64x2 | 
| Architecture | Base register | Aliases | 
|---|
| Architecture | Unsupported register | Reason | 
|---|
| Architecture | Register class | Modifier | Example output | LLVM modifier | 
|---|
| s390x | vreg | None | %v0 | None |