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hwacha scalar operations div/sqrt never receives valid from FPU #45

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alexhilaev opened this issue Sep 22, 2023 · 0 comments
Open

hwacha scalar operations div/sqrt never receives valid from FPU #45

alexhilaev opened this issue Sep 22, 2023 · 0 comments

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@alexhilaev
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Hwacha uses FPInput/FPResult in scalar-fpu-interface.scala, but io.cp_resp.valid never set to true, it is not connected to divSqrt_wen only to mem_ctrl.fma || mem_ctrl.fastpipe || mem_ctrl.fromint. This means that all operations with div/sqrt always stall pipeline when we try to use boom with hwacha with scalar div/sqrt operations in hwacha i.e. rv64ud-p-svec-fdiv.
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