chao an 95fcc286a2 risc-v/toolchain: configurable vendor ISA extensions
This option allows the platform to enable some vendor-customized ISA extensions,
E.g OpenHW, SiFive, T-Head.

SiFive Intelligence Extensions:
    SiFive Vector Coprocessor Interface(VCIX): xsfvcp
    SiFive FP32-to-int8 Ranged Clip Instructions: Xsfvfnrclipxfqf
    SiFive Matrix Multiply Accumulate Instructions: Xsfvfwmaccqqq
    SiFive Int8 Matrix Multiplication Instructions: XSFvqmaccqoq
Command Line:
    xsfvcp0p1_xsfvfnrclipxfqf0p1_xsfvfwmaccqqq0p1_xsfvqmaccqoq0p1

Signed-off-by: chao an <anchao@lixiang.com>
2024-01-15 22:31:39 -08:00
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