| Issue |
159823
|
| Summary |
[x86] Crash/miscompile using APX
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
efriedma-quic
|
Build with `clang -mapx-features=egpr,ndd`:
```
void f(char*c) {
register char a asm("ah");
register char b asm("r16b");
asm("":"=r"(a), "=r"(b));
*c = a-b;
}
```
Crashes with:
```
fatal error: error in backend: Cannot encode high byte register in VEX/EVEX-prefixed instruction
```
(See also #158585.)
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