| Issue |
124907
|
| Summary |
[clang-cl] arm_neon.h: cannot mangle built-in type __mfp8
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
tycho
|
On the `release/20.x` and `main` branches, when targeting ARM64 on clang-cl:
https://gcc.godbolt.org/z/Mx1Y8hze4
```
In file included from <source>:1:
/opt/compiler-explorer/clang-trunk-20250129/lib/clang/20/include/arm_neon.h(41124,1): error: cannot mangle this built-in type: __mfp8 yet
41124 | __ai __attribute__((target("fp8,neon"))) bfloat16x8_t vcvt1_bf16_mf8_fpm(mfloat8x8_t __p0, fpm_t __p1) {
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
41125 | bfloat16x8_t __ret;
| ~~~~~~~~~~~~~~~~~~~
41126 | __ret = (bfloat16x8_t) __builtin_neon_vcvt1_bf16_mf8_fpm(__p0, __p1);
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
41127 | return __ret;
| ~~~~~~~~~~~~~
41128 | }
| ~
/opt/compiler-explorer/clang-trunk-20250129/lib/clang/20/include/arm_neon.h(124,14): note: expanded from macro '__ai'
124 | #define __ai static __inline__ __attribute__((__always_inline__, __nodebug__))
| ^
1 error generated.
```
Just including `<arm_neon.h>` causes a compile error, due to the `__mfp8` type. This prevents compiling any Windows ARM64 code that includes the intrinsics header.
Can someone get this fixed before LLVM 20 release please?
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