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AES-GCM NEON: cope with missing vaddq_p128.

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In some compilers (I'm told clang 10, in particular), the NEON
intrinsic vaddq_p128 is missing, even though its input type poly128_t
is provided.

vaddq_p128 is just an XOR of two vector registers, so that's easy to
work around by casting to a more mundane type and back. Added a
configure-time test for that intrinsic, and a workaround to be used in
its absence.
This commit is contained in:
Simon Tatham
2022-10-12 12:54:36 +01:00
parent 0615767224
commit 2222cd104d
3 changed files with 17 additions and 0 deletions
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cmake/cmake.h.in
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@ -54,6 +54,7 @@
#cmakedefine01 HAVE_CLMUL
#cmakedefine01 HAVE_NEON_CRYPTO
#cmakedefine01 HAVE_NEON_PMULL
#cmakedefine01 HAVE_NEON_VADDQ_P128
#cmakedefine01 HAVE_NEON_SHA512
#cmakedefine01 HAVE_NEON_SHA512_INTRINSICS
#cmakedefine01 USE_ARM64_NEON_H