llvm-project

617854f8 - [AMDGPU] LRO: allow same-BB non-lookthrough users for PHI (#160909)

[AMDGPU] LRO: allow same-BB non-lookthrough users for PHI (#160909) Loop headers frequently consume the loop-carried value in the header block via non-lookthrough ops (e.g. byte-wise vector binops). LiveRegOptimizer’s same-BB filter currently prunes these users, so the loop-carried PHI is not coerced to i32 and the intended packed form is lost. Relax the filter: when the def is a PHI, allow same-BB non-lookthrough users. Also fix the check to look at the user (CII) rather than the def (II) so the walk does not terminate prematurely.