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luojia65 a49ca40768 riscv: P extension intrinsics for packed SIMD (part 1)
Implement by inline assembly for now, uses `pure, nomem, nostack` for
all packed simd arithmetic instructions. Uses `inlateout` when it
requires using the same register for input and output, use `lateout`
for all output registers.

This commit also includes a rearrangement of shared risc-v architecture
module to improve documents. It also includes a doc test fix, gate sm3/4
and use explict sm3/4 instruction under rustc target feature.
2022-09-13 05:03:04 +02:00
library/stdarch riscv: P extension intrinsics for packed SIMD (part 1) 2022-09-13 05:03:04 +02:00