| Issue |
61422
|
| Summary |
[AMDGPU] Wrong code depending on placement of a multiplication
|
| Labels |
backend:AMDGPU
|
| Assignees |
arsenm
|
| Reporter |
jdoerfert
|
As shown below, I have created two version that only differ in the placement of `%i86`.
Both positions are equaly valid.
Note that the `%i8Xb` values are unused and will not make it into the DAG.
<img width="1842" alt="Screenshot 2023-03-14 at 4 13 56 PM" src=""
The version with a sunk `%i86` will later run into a trap it should not run into.
See `{running,trapping}_close.ll` as well as the .s and .out files for information.
Backend is run with O1. I also left comments in the code about other versions that trap or not.
Especially close to the trap 3 versions are described that may expose the same or a different issue.
The executable should be able to reproduce this on a gfx90a with a dynamic build of LLVM/OpenMP offloading.
`LIBOMPTARGET_JIT_OPT_LEVEL=1 LIBOMPTARGET_JIT_REPLACEMENT_MODULE=trapping_close.ll LIBOMPTARGET_JIT_SKIP_OPT=1 ./check_spo_batched_reduction -n 1 -s 1 -w 2`
Found while reducing #60937
[repro_close.tar.gz](https://github.com/llvm/llvm-project/files/10974657/repro_close.tar.gz)
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