| Issue |
202481
|
| Summary |
[DirectX] i8 switch lookup tables need to be legalized
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
farzonl
|
This simplifyCFG change https://github.com/llvm/llvm-project/pull/202071 has causes switch tables to reduce in size to i8 global arrays.
Now we are seeing failures in the offload test suite for test cases with switch statements like this one:
https://github.com/llvm/offload-test-suite/actions/runs/27128916736/job/80064592198#step:13:569
```
# .---command stdout------------
# | Function: main: error: I8 can only be used as immediate value for intrinsic or as i8* via bitcast by lifetime intrinsics.
# | note: at '%switch.gep5 = getelementptr inbounds [3 x i8], [3 x i8]* @switch.table.main, i32 0, i32 %10' in block 'switch.lookup' of function 'main'.
# | Function: main: error: I8 can only be used as immediate value for intrinsic or as i8* via bitcast by lifetime intrinsics.
# | note: at '%11 = load i8, i8* %switch.gep5, align 1' in block 'switch.lookup' of function 'main'.
# | Function: main: error: I8 can only be used as immediate value for intrinsic or as i8* via bitcast by lifetime intrinsics.
# | note: at '%12 = zext i8 %11 to i32' in block 'switch.lookup' of function 'main'.
# | Validation failed.
# |
# `-----------------------------
```
_Originally posted by @farzonl in https://github.com/llvm/llvm-project/issues/202071#issuecomment-4650421187_
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