-OPENSSL_atomic_add:
- movl (%rdi),%eax
-.Lspin: lea (%rsi,%rax),%r8
-lock; cmpxchg %r8d,(%rdi)
- jne .Lspin
- mov %r8d,%eax
- cdqe
+OPENSSL_ia32_cpuid:
+ mov %rbx,%r8
+
+ xor %eax,%eax
+ cpuid
+ xor %eax,%eax
+ cmp \$0x756e6547,%ebx # "Genu"
+ setne %al
+ mov %eax,%r9d
+ cmp \$0x49656e69,%edx # "ineI"
+ setne %al
+ or %eax,%r9d
+ cmp \$0x6c65746e,%ecx # "ntel"
+ setne %al
+ or %eax,%r9d
+
+ mov \$1,%eax
+ cpuid
+ cmp \$0,%r9d
+ jne .Lnotintel
+ or \$0x00100000,%edx # use reserved 20th bit to engage RC4_CHAR
+ and \$15,%ah
+ cmp \$15,%ah # examine Family ID
+ je .Lnotintel
+ or \$0x40000000,%edx # use reserved bit to skip unrolled loop
+.Lnotintel:
+ bt \$28,%edx # test hyper-threading bit
+ jnc .Ldone
+ shr \$16,%ebx
+ cmp \$1,%bl # see if cache is shared
+ ja .Ldone
+ and \$0xefffffff,%edx # ~(1<<28)
+.Ldone:
+ shl \$32,%rcx
+ mov %edx,%eax
+ mov %r8,%rbx
+ or %rcx,%rax