diff options
| author | Adam Langley <agl@google.com> | 2015-11-18 02:25:00 +0300 |
|---|---|---|
| committer | Adam Langley <agl@google.com> | 2015-11-19 03:15:11 +0300 |
| commit | 9e65d487b8b907a3ddb84f736b89e0a8f95abce3 (patch) | |
| tree | 5dcbac1da33487eab26516278213d721db32c5cc /include/openssl/cpu.h | |
| parent | 3ac32b1eda0da7a99d9c2b6c605fe50af80ccd90 (diff) | |
Allow |CRYPTO_is_NEON_capable| to be known at compile time, if possible.
If -mfpu=neon is passed then we don't need to worry about checking for
NEON support at run time. This change allows |CRYPTO_is_NEON_capable| to
statically return 1 in this case. This then allows the compiler to
discard generic code in several cases.
Change-Id: I3b229740ea3d5cb0a304f365c400a0996d0c66ef
Reviewed-on: https://boringssl-review.googlesource.com/6523
Reviewed-by: David Benjamin <davidben@chromium.org>
Reviewed-by: Adam Langley <agl@google.com>
Diffstat (limited to 'include/openssl/cpu.h')
| -rw-r--r-- | include/openssl/cpu.h | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/include/openssl/cpu.h b/include/openssl/cpu.h index 19e11d04..e946304a 100644 --- a/include/openssl/cpu.h +++ b/include/openssl/cpu.h @@ -102,10 +102,20 @@ extern uint32_t OPENSSL_ia32cap_P[4]; #if !defined(OPENSSL_STATIC_ARMCAP) -/* CRYPTO_is_NEON_capable returns true if the current CPU has a NEON unit. Note - * that |OPENSSL_armcap_P| also exists and contains the same information in a - * form that's easier for assembly to use. */ -OPENSSL_EXPORT char CRYPTO_is_NEON_capable(void); +/* CRYPTO_is_NEON_capable_at_runtime returns true if the current CPU has a NEON + * unit. Note that |OPENSSL_armcap_P| also exists and contains the same + * information in a form that's easier for assembly to use. */ +OPENSSL_EXPORT char CRYPTO_is_NEON_capable_at_runtime(void); + +/* CRYPTO_is_NEON_capable returns true if the current CPU has a NEON unit. If + * this is known statically then it returns one immediately. */ +static inline int CRYPTO_is_NEON_capable(void) { +#if defined(__ARM_NEON__) + return 1; +#else + return CRYPTO_is_NEON_capable_at_runtime(); +#endif +} /* CRYPTO_set_NEON_capable sets the return value of |CRYPTO_is_NEON_capable|. * By default, unless the code was compiled with |-mfpu=neon|, NEON is assumed |