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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 <philipp.tomsich@vrull.eu>
Signed-off-by: Henry Brausen <henry.brausen@vrull.eu>

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/17640)
This commit is contained in:
Henry Brausen 2022-01-28 01:57:54 -07:00 committed by Pauli
parent 999376dcf3
commit e4fd3fc379
1 changed files with 7 additions and 0 deletions
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7
include/crypto/modes.h
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@ -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