diff options
Diffstat (limited to '')
| -rw-r--r-- | external/openssl/openssl-no-_umul128-on-aarch64.patch.1 | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/external/openssl/openssl-no-_umul128-on-aarch64.patch.1 b/external/openssl/openssl-no-_umul128-on-aarch64.patch.1 new file mode 100644 index 000000000..c7ca53bc5 --- /dev/null +++ b/external/openssl/openssl-no-_umul128-on-aarch64.patch.1 @@ -0,0 +1,58 @@ +From 98f9a401c3964c7ff0e6ca048685e28a2a6401d4 Mon Sep 17 00:00:00 2001 +From: Hubert Kario <hkario@redhat.com> +Date: Wed, 8 Feb 2023 14:13:24 +0100 +Subject: [PATCH] rsa: add msvc intrinsic for non x64 platforms + +_umul128() is x86_64 (x64) only, while __umulh() works everywhere, but +doesn't generate optimal code on x64 + +Reviewed-by: Dmitry Belyavskiy <beldmit@gmail.com> +Reviewed-by: Paul Dale <pauli@openssl.org> +Reviewed-by: Tomas Mraz <tomas@openssl.org> +(Merged from https://github.com/openssl/openssl/pull/20244) + +(cherry picked from commit 075652f224479dad2e64b92e791b296177af8705) +--- + crypto/bn/rsa_sup_mul.c | 24 +++++++++++++++++++++++- + 1 file changed, 23 insertions(+), 1 deletion(-) + +diff --git a/crypto/bn/rsa_sup_mul.c b/crypto/bn/rsa_sup_mul.c +index 0e0d02e1946e..3b57161b4589 100644 +--- a/crypto/bn/rsa_sup_mul.c ++++ b/crypto/bn/rsa_sup_mul.c +@@ -110,12 +110,34 @@ static ossl_inline void _mul_limb(limb_t *hi, limb_t *lo, limb_t a, limb_t b) + *lo = (limb_t)t; + } + #elif (BN_BYTES == 8) && (defined _MSC_VER) +-/* https://learn.microsoft.com/en-us/cpp/intrinsics/umul128?view=msvc-170 */ ++# if defined(_M_X64) ++/* ++ * on x86_64 (x64) we can use the _umul128 intrinsic to get one `mul` ++ * instruction to get both high and low 64 bits of the multiplication. ++ * https://learn.microsoft.com/en-us/cpp/intrinsics/umul128?view=msvc-140 ++ */ ++#include <intrin.h> + #pragma intrinsic(_umul128) + static ossl_inline void _mul_limb(limb_t *hi, limb_t *lo, limb_t a, limb_t b) + { + *lo = _umul128(a, b, hi); + } ++# elif defined(_M_ARM64) || defined (_M_IA64) ++/* ++ * We can't use the __umulh() on x86_64 as then msvc generates two `mul` ++ * instructions; so use this more portable intrinsic on platforms that ++ * don't support _umul128 (like aarch64 (ARM64) or ia64) ++ * https://learn.microsoft.com/en-us/cpp/intrinsics/umulh?view=msvc-140 ++ */ ++#include <intrin.h> ++static ossl_inline void _mul_limb(limb_t *hi, limb_t *lo, limb_t a, limb_t b) ++{ ++ *lo = a * b; ++ *hi = __umulh(a, b); ++} ++# else ++# error Only x64, ARM64 and IA64 supported. ++# endif /* defined(_M_X64) */ + #else + /* + * if the compiler doesn't have either a 128bit data type nor a "return |