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Add s_nop before s_sendmsg. This is required because the HW does not check for dependencies for SALU writes to M0. Section 4.5: Manually Inserted Wait States (NOPs) "AMD Instinct MI200" Instruction Set Architecture https://www.amd.com/content/dam/amd/en/documents/instinct-tech-docs/instruction-set-architectures/instinct-mi200-cdna2-instruction-set-architecture.pdf Change-Id: I90f503e3cc80cd29eab8bafa2565699461654055 Signed-off-by: Chris Freehill <cfreehil@amd.com>