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We got to talking about how Zmmul and M interact with each other https://github.com/riscv/riscv-isa-manual/issues/869 , and it turns out that QEMU's behavior is slightly wrong: having Zmmul and M is a legal combination, it just means that the multiplication instructions are supported even when M is disabled at runtime via misa. This just stops overriding M from Zmmul, with that the other checks for the multiplication instructions work as per the ISA. Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Message-Id: <20220714180033.22385-1-palmer@rivosinc.com> Signed-off-by: Alistair Francis <alistair.francis@wdc.com> |
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