UTCS CS352, S07 Lecture 10 9 Types of Data Hazards RAW (read after write) –only hazard for fixed pipelines –later instruction must read after earlier instruction writes WAW (write after write) –variable-length pipeline –later instruction must write after earlier instruction writes WAR (write after read) –pipelines with late read –later instruction must write after earlier instruction reads FRAMWFRAMW FR123 FRAMW 4W FR123 FRAMW 4R5W
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