mssefat 7495f92f08 [AMDGPU] Fix undefined scc register in successor block of SI_KILL terminators (#134718) ...

Fix issue 131298 where an undefined $scc register causes verifier errors
when using SI_KILL_F32_COND_IMM_TERMINATOR instructions. The problem
occurs because the $scc register defined in a comparison before the kill
terminator is used in successor blocks, but was not properly marked as live-in.

This patch:
- Adds code to check if SCC is used in the successor block
- Adds SCC as a live-in to successor blocks
- Handles both explicit and implicit uses of SCC

With this patch the machine verifier no longer reports undefined $scc
errors in following kill terminator instruction.

Fixes #131298

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Co-authored-by: Matt Arsenault <arsenm2@gmail.com>

2025-04-30 09:02:45 -05:00

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