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Avoid 3-way scrypt on Intel Atom

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pooler 2012-05-26 19:59:46 +02:00
parent ee7630edfd
commit 29d64a8b6f
1 changed files with 30 additions and 3 deletions
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33
scrypt-x64.S
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@ -39,20 +39,47 @@
scrypt_best_throughput: scrypt_best_throughput:
_scrypt_best_throughput: _scrypt_best_throughput:
pushq %rbx pushq %rbx
/* Check for AuthenticAMD */
xorq %rax, %rax xorq %rax, %rax
cpuid cpuid
movl $3, %eax movl $3, %eax
cmpl $0x444d4163, %ecx cmpl $0x444d4163, %ecx
jne scrypt_best_throughput_exit jne scrypt_best_throughput_not_amd
cmpl $0x69746e65, %edx cmpl $0x69746e65, %edx
jne scrypt_best_throughput_exit jne scrypt_best_throughput_not_amd
cmpl $0x68747541, %ebx cmpl $0x68747541, %ebx
jne scrypt_best_throughput_exit jne scrypt_best_throughput_not_amd
/* Check for AMD K8 */
movl $1, %eax movl $1, %eax
cpuid cpuid
andl $0x0ff00000, %eax andl $0x0ff00000, %eax
jz scrypt_best_throughput_one
movl $3, %eax
jmp scrypt_best_throughput_exit
scrypt_best_throughput_not_amd:
/* Check for GenuineIntel */
cmpl $0x6c65746e, %ecx
jne scrypt_best_throughput_exit
cmpl $0x49656e69, %edx
jne scrypt_best_throughput_exit
cmpl $0x756e6547, %ebx
jne scrypt_best_throughput_exit
/* Check for Intel Atom */
movl $1, %eax
cpuid
movl %eax, %edx
andl $0x0ff00f00, %eax
cmpl $0x00000600, %eax
movl $3, %eax movl $3, %eax
jnz scrypt_best_throughput_exit jnz scrypt_best_throughput_exit
andl $0x000f00f0, %edx
cmpl $0x000100c0, %edx
je scrypt_best_throughput_one
cmpl $0x00020060, %edx
je scrypt_best_throughput_one
cmpl $0x00030060, %edx
jne scrypt_best_throughput_exit
scrypt_best_throughput_one:
movl $1, %eax movl $1, %eax
scrypt_best_throughput_exit: scrypt_best_throughput_exit:
popq %rbx popq %rbx