TANG Tiancheng f7230e09b1 util: Add RISC-V vector extension probe in cpuinfo ... Add support for probing RISC-V vector extension availability in the backend. This information will be used when deciding whether to use vector instructions in code generation. Cache lg2(vlenb) for the backend. The storing of lg2(vlenb) means we can convert all of the division into subtraction. While the compiler doesn't support RISCV_HWPROBE_EXT_ZVE64X, we use RISCV_HWPROBE_IMA_V instead. RISCV_HWPROBE_IMA_V is more strictly constrainted than RISCV_HWPROBE_EXT_ZVE64X. At least in current QEMU implemenation, the V vector extension depends on the zve64d extension. Signed-off-by: TANG Tiancheng <tangtiancheng.ttc@alibaba-inc.com> Reviewed-by: Liu Zhiwei <zhiwei_liu@linux.alibaba.com> Tested-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com> Message-ID: <20241007025700.47259-2-zhiwei_liu@linux.alibaba.com> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>		2024-10-22 11:57:25 -07:00
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host	util: Add RISC-V vector extension probe in cpuinfo	2024-10-22 11:57:25 -07:00