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move cpu modifier flags check to source file

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Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
This commit is contained in:
Jerry Yu
2023-02-15 11:35:55 +08:00
parent edc6ae9578
commit 35f2b26fd8
3 changed files with 44 additions and 38 deletions
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38
library/sha512.c
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@ -43,6 +43,44 @@
#if defined(__aarch64__)
# if defined(MBEDTLS_SHA512_USE_A64_CRYPTO_IF_PRESENT) || \
defined(MBEDTLS_SHA512_USE_A64_CRYPTO_ONLY)
/* *INDENT-OFF* */
/*
* Best performance comes from most recent compilers, with intrinsics and -O3.
* Must compile with -march=armv8.2-a+sha3, but we can't detect armv8.2-a, and
* can't always detect __ARM_FEATURE_SHA512 (notably clang 7-12).
*
* GCC < 8 won't work at all (lacks the sha512 instructions)
* GCC >= 8 uses intrinsics, sets __ARM_FEATURE_SHA512
*
* Clang < 7 won't work at all (lacks the sha512 instructions)
* Clang 7-12 don't have intrinsics (but we work around that with inline
* assembler) or __ARM_FEATURE_SHA512
* Clang == 13.0.0 same as clang 12 (only seen on macOS)
* Clang >= 13.0.1 has __ARM_FEATURE_SHA512 and intrinsics
*/
#if !defined(__ARM_FEATURE_SHA512)
/* Test Clang first, as it defines __GNUC__ */
# if defined(__clang__)
# if __clang_major__ < 7
# error "A more recent Clang is required for MBEDTLS_SHA512_USE_A64_CRYPTO_*"
# elif __clang_major__ < 13 || \
(__clang_major__ == 13 && __clang_minor__ == 0 && __clang_patchlevel__ == 0)
/* We implement the intrinsics with inline assembler, so don't error */
# else
# error "Must use minimum -march=armv8.2-a+sha3 for MBEDTLS_SHA512_USE_A64_CRYPTO_*"
# endif
# elif defined(__GNUC__)
# if __GNUC__ < 8
# error "A more recent GCC is required for MBEDTLS_SHA512_USE_A64_CRYPTO_*"
# else
# error "Must use minimum -march=armv8.2-a+sha3 for MBEDTLS_SHA512_USE_A64_CRYPTO_*"
# endif
# else
# error "Only GCC and Clang supported for MBEDTLS_SHA512_USE_A64_CRYPTO_*"
# endif
#endif
/* *INDENT-ON* */
# include <arm_neon.h>
# endif
# if defined(MBEDTLS_SHA512_USE_A64_CRYPTO_IF_PRESENT)