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crypto,cmake: enable ASM mul impl on ARM; add cmake opt

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This was disabled earlier as part of diagnosing failing tests
on ARM, which turned out to be due to aliasing, fixed by
adding -fno-strict-aliasing. So, re-enabling it back.
This commit is contained in:
redfish 2016-09-04 04:27:51 +00:00
parent afe3cce7fe
commit 24d93370ad
2 changed files with 13 additions and 3 deletions
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10
src/crypto/CMakeLists.txt
View file

@ -74,3 +74,13 @@ bitmonero_add_library(crypto
${crypto_sources}
${crypto_headers}
${crypto_private_headers})
if (ARM)
option(NO_OPTIMIZED_MULTIPLY_ON_ARM
"Compute multiply using generic C implementation instead of ARM ASM" OFF)
if(NO_OPTIMIZED_MULTIPLY_ON_ARM)
message(STATUS "Using generic C implementation for multiply")
set_property(SOURCE slow-hash.c
PROPERTY COMPILE_DEFINITIONS "NO_OPTIMIZED_MULTIPLY_ON_ARM")
endif()
endif()

6
src/crypto/slow-hash.c
View file

@ -679,7 +679,7 @@ void slow_hash_free_state(void)
#include "aesb.c"
#ifndef ARM_MUL_IMPL_ASM
#ifdef NO_OPTIMIZED_MULTIPLY_ON_ARM
/* The asm corresponds to this C code */
#define SHORT uint32_t
#define LONG uint64_t
@ -712,7 +712,7 @@ void mul(const uint8_t *ca, const uint8_t *cb, uint8_t *cres) {
res[0] = t.tmp[6];
res[1] = t.tmp[7];
}
#else // ARM_MUL_IMPL_ASM (TODO: this fails hash-slow test with GCC 6.1.1)
#else // !NO_OPTIMIZED_MULTIPLY_ON_ARM
/* Can work as inline, but actually runs slower. Keep it separate */
#define mul(a, b, c) cn_mul128(a, b, c)
@ -747,7 +747,7 @@ __asm__ __volatile__(
: [A]"r"(aa[1]), [a]"r"(aa[0]), [B]"r"(bb[1]), [b]"r"(bb[0]), [r]"r"(r)
: "cc", "memory");
}
#endif // ARM_MUL_IMPL_ASM
#endif // NO_OPTIMIZED_MULTIPLY_ON_ARM
STATIC INLINE void sum_half_blocks(uint8_t* a, const uint8_t* b)
{