| Issue |
123208
|
| Summary |
AMDGPU silently converts incorrect physical register asm constraint to virtual register
|
| Labels |
backend:AMDGPU,
accepts-invalid
|
| Assignees |
|
| Reporter |
arsenm
|
```
; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx940 < %s
define void @invalid_sgpr(<2 x i32> inreg %arg0) {
call void asm sideeffect "; use $0", "{s[1:2]}"(<2 x i32> %arg0)
ret void
}
```
s[1:2] is not a valid SGPR reference as 64-bit SGPRs require even alignment. This is silently accepted, and appears to be treated as a virtual register constraint. In -stop-after=finalize-isel, I see:
```
%10:sreg_64 = COPY %11
INLINEASM &"; use $0", 1 /* sideeffect attdialect */, 3997705 /* reguse:SReg_64 */, %10
```
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