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Code Issues Releases Wiki Activity

Improve the byte swapping logic for GCC.

pull/231/head
David Garske 2022-07-20 10:30:33 -07:00
parent c32c111397
commit d9b664b719
1 changed files with 7 additions and 4 deletions
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11
wolftpm/tpm2_types.h
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@ -636,7 +636,9 @@ static inline word16 ByteReverseWord16(word16 value)
static inline word32 ByteReverseWord32(word32 value)
{
#ifdef PPC_INTRINSICS
#if !defined(WOLF_NO_BUILTIN) && defined(__GNUC_PREREQ) && __GNUC_PREREQ(4, 3)
return (word32)__builtin_bswap32(value);
#elif defined(PPC_INTRINSICS)
/* PPC: load reverse indexed instruction */
return (word32)__lwbrx(&value,0);
#elif defined(__ICCARM__)
@ -645,9 +647,6 @@ static inline word32 ByteReverseWord32(word32 value)
return (word32)__rev(value);
#elif defined(__CCRX__)
return (word32)_builtin_revl(value);
#elif defined(WOLF_ALLOW_BUILTIN) && \
defined(__GNUC_PREREQ) && __GNUC_PREREQ(4, 3)
return (word32)__builtin_bswap32(value);
#elif defined(WOLFSSL_BYTESWAP32_ASM) && defined(__GNUC__) && \
defined(__aarch64__)
__asm__ volatile (
@ -677,8 +676,12 @@ static inline word32 ByteReverseWord32(word32 value)
static inline word64 ByteReverseWord64(word64 value)
{
#if !defined(WOLF_NO_BUILTIN) && defined(__GNUC_PREREQ) && __GNUC_PREREQ(4, 3)
return (word64)__builtin_bswap64(value);
#else
return (word64)((word64)ByteReverseWord32((word32)value)) << 32 |
(word64)ByteReverseWord32((word32)(value >> 32));
#endif
}