Include 64-bit optimized assembly on Windows when building x64

mozilla/security/nss/lib/freebl/arcfour-amd64-masm.asm

Index: mozilla/security/nss/lib/freebl/arcfour-amd64-masm.asm
diff --git a/mozilla/security/nss/lib/freebl/arcfour-amd64-masm.asm b/mozilla/security/nss/lib/freebl/arcfour-amd64-masm.asm
new file mode 100644
index 0000000000000000000000000000000000000000..1601c4f899895dd7ee2d0825a987268442c0d6bd
--- /dev/null
+++ b/mozilla/security/nss/lib/freebl/arcfour-amd64-masm.asm
@@ -0,0 +1,107 @@
+; This Source Code Form is subject to the terms of the Mozilla Public
+; License, v. 2.0. If a copy of the MPL was not distributed with this
+; file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+; ** ARCFOUR implementation optimized for AMD64.
+; **
+; ** The throughput achieved by this code is about 320 MBytes/sec, on
+; ** a 1.8 GHz AMD Opteron (rev C0) processor.
+
+.CODE
+
+; extern void ARCFOUR(RC4Context *cx, unsigned long long inputLen, 
+;                     const unsigned char *input, unsigned char *output);
+
+
+ARCFOUR PROC
+
+        push    rbp
+        push    rbx
+        push    rsi
+        push    rdi
+
+        mov     rbp, rcx                        ; key = ARG(key)
+        mov     rbx, rdx                        ; rbx = ARG(len)
+        mov     rsi, r8                         ; in = ARG(in)
+        mov     rdi, r9                         ; out = ARG(out)
+        mov     rcx, [rbp]                      ; x = key->x
+        mov     rdx, [rbp+8]                    ; y = key->y
+        add     rbp, 16                         ; d = key->data
+        inc     rcx                             ; x++
+        and     rcx, 0ffh                       ; x &= 0xff
+        lea     rbx, [rbx+rsi-8]                ; rbx = in+len-8
+        mov     r9, rbx                         ; tmp = in+len-8
+        mov     rax, [rbp+rcx*8]                ; tx = d[x]
+        cmp     rbx, rsi                        ; cmp in with in+len-8
+        jl      Lend                            ; jump if (in+len-8 < in)
+
+Lstart:
+        add     rsi, 8                          ; increment in
+        add     rdi, 8                          ; increment out
+
+        ;
+        ; generate the next 8 bytes of the rc4 stream into r8
+        ;
+
+        mov     r11, 8                          ; byte counter
+
+@@:
+        add     dl, al                          ; y += tx
+        mov     ebx, [rbp+rdx*8]                ; ty = d[y]
+        mov     [rbp+rcx*8], ebx                ; d[x] = ty
+        add     bl, al                          ; val = ty + tx
+        mov     [rbp+rdx*8], eax                ; d[y] = tx
+        inc     cl                              ; x++ (NEXT ROUND)
+        mov     eax, [rbp+rcx*8]                ; tx = d[x] (NEXT ROUND)
+        mov     r8b, [rbp+rbx*8]                ; val = d[val]
+        dec     r11b
+        ror     r8, 8                           ; (ror does not change ZF)
+        jnz     @b
+
+        ;
+        ; xor 8 bytes
+        ;
+
+        xor     r8, [rsi-8]
+        cmp     rsi, r9                         ; cmp in+len-8 with in
+        mov     [rdi-8], r8
+        jle     Lstart
+
+Lend:
+        add     r9, 8                           ; tmp = in+len
+
+        ;
+        ; handle the last bytes, one by one
+        ;
+
+@@:
+        cmp     r9, rsi                         ; cmp in with in+len
+        jle     Lfinished                       ; jump if (in+len <= in)
+        add     dl, al                          ; y += tx
+        mov     ebx, [rbp+rdx*8]                ; ty = d[y]
+        mov     [rbp+rcx*8], ebx                ; d[x] = ty
+        add     bl, al                          ; val = ty + tx
+        mov     [rbp+rdx*8], eax                ; d[y] = tx
+        inc     cl                              ; x++ (NEXT ROUND)
+        mov     eax, [rbp+rcx*8]                ; tx = d[x] (NEXT ROUND)
+        mov     r8b, [rbp+rbx*8]                ; val = d[val]
+        xor     r8b, [rsi]                      ; xor 1 byte
+        mov     [rdi], r8b
+        inc     rsi                             ; in++
+        inc     rdi
+        jmp     @b
+
+Lfinished:
+        dec     rcx                             ; x--
+        mov     [rbp-8], dl                     ; key->y = y
+        mov     [rbp-16], cl                    ; key->x = x
+
+        pop     rdi
+        pop     rsi
+        pop     rbx
+        pop     rbp
+        ret
+
+ARCFOUR ENDP
+
+END