llvm-project

679bc1fb - [AMDGPU] Fix scratch address materialization in SVS frame index fallback

[AMDGPU] Fix scratch address materialization in SVS frame index fallback The flat scratch SVS frame index fallback folded the offset in with V_ADD_U32_e32 writing into FrameReg (an SGPR, an illegal VALU destination) and added it to FrameReg instead of the scavenged VGPR used as vaddr, so the offset never reached the address. Materialize FrameReg + Offset into the scavenged VGPR instead, or just the offset when there is no frame register. NFC in practice: for flat scratch an SGPR saddr is always legal, so the fallback is only entered with no frame register, where the behavior is unchanged. The FrameReg != 0 path is currently unreachable. Co-authored-by: Cursor <cursoragent@cursor.com>