From e4fd3fc379d76d9cd33ea6699268485606447737 Mon Sep 17 00:00:00 2001 From: Henry Brausen Date: Fri, 28 Jan 2022 01:57:54 -0700 Subject: [PATCH] Add BSWAP4/BSWAP8 routines for riscv64 with Zbb These routines make use of the rev8 instruction in the Zbb extension to accelerate byte-swapping when OpenSSL is built specifically for a machine that supports Zbb. Reviewed-by: Philipp Tomsich Signed-off-by: Henry Brausen Reviewed-by: Tomas Mraz Reviewed-by: Paul Dale (Merged from https://github.com/openssl/openssl/pull/17640) --- include/crypto/modes.h | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/include/crypto/modes.h b/include/crypto/modes.h index 87331557fc..f98b705655 100644 --- a/include/crypto/modes.h +++ b/include/crypto/modes.h @@ -74,6 +74,13 @@ typedef unsigned char u8; asm ("rev %0,%1" \ : "=r"(ret_) : "r"((u32)(x))); \ ret_; }) +# elif defined(__riscv_zbb) && __riscv_xlen == 64 +# define BSWAP8(x) ({ u64 ret_=(x); \ + asm ("rev8 %0,%0" \ + : "+r"(ret_)); ret_; }) +# define BSWAP4(x) ({ u32 ret_=(x); \ + asm ("rev8 %0,%0; srli %0,%0,32"\ + : "+r"(ret_)); ret_; }) # endif # elif defined(_MSC_VER) # if _MSC_VER>=1300 -- 2.34.1