; inffasx64.asm is a hand tuned assembler version of inffast.c - fast decoding ; version for AMD64 on Windows using Microsoft C compiler ; ; inffasx64.asm is automatically convert from AMD64 portion of inffas86.c ; inffasx64.asm is called by inffas8664.c, which contain more info. ; to compile this file, I use option ; ml64.exe /Flinffasx64 /c /Zi inffasx64.asm ; with Microsoft Macro Assembler (x64) for AMD64 ; ; This file compile with Microsoft Macro Assembler (x64) for AMD64 ; ; ml64.exe is given with Visual Studio 2005/2008/2010 and Windows WDK ; ; (you can get Windows WDK with ml64 for AMD64 from ; http://www.microsoft.com/whdc/Devtools/wdk/default.mspx for low price) ; .code inffas8664fnc PROC ; see http://weblogs.asp.net/oldnewthing/archive/2004/01/14/58579.aspx and ; http://msdn.microsoft.com/library/en-us/kmarch/hh/kmarch/64bitAMD_8e951dd2-ee77-4728-8702-55ce4b5dd24a.xml.asp ; ; All registers must be preserved across the call, except for ; rax, rcx, rdx, r8, r-9, r10, and r11, which are scratch. mov [rsp-8],rsi mov [rsp-16],rdi mov [rsp-24],r12 mov [rsp-32],r13 mov [rsp-40],r14 mov [rsp-48],r15 mov [rsp-56],rbx mov rax,rcx mov [rax+8], rbp ; /* save regs rbp and rsp */ mov [rax], rsp mov rsp, rax ; /* make rsp point to &ar */ mov rsi, [rsp+16] ; /* rsi = in */ mov rdi, [rsp+32] ; /* rdi = out */ mov r9, [rsp+24] ; /* r9 = last */ mov r10, [rsp+48] ; /* r10 = end */ mov rbp, [rsp+64] ; /* rbp = lcode */ mov r11, [rsp+72] ; /* r11 = dcode */ mov rdx, [rsp+80] ; /* rdx = hold */ mov ebx, [rsp+88] ; /* ebx = bits */ mov r12d, [rsp+100] ; /* r12d = lmask */ mov r13d, [rsp+104] ; /* r13d = dmask */ ; /* r14d = len */ ; /* r15d = dist */ cld cmp r10, rdi je L_one_time ; /* if only one decode left */ cmp r9, rsi jne L_do_loop L_one_time: mov r8, r12 ; /* r8 = lmask */ cmp bl, 32 ja L_get_length_code_one_time lodsd ; /* eax = *(uint *)in++ */ mov cl, bl ; /* cl = bits, needs it for shifting */ add bl, 32 ; /* bits += 32 */ shl rax, cl or rdx, rax ; /* hold |= *((uint *)in)++ << bits */ jmp L_get_length_code_one_time ALIGN 4 L_while_test: cmp r10, rdi jbe L_break_loop cmp r9, rsi jbe L_break_loop L_do_loop: mov r8, r12 ; /* r8 = lmask */ cmp bl, 32 ja L_get_length_code ; /* if (32 < bits) */ lodsd ; /* eax = *(uint *)in++ */ mov cl, bl ; /* cl = bits, needs it for shifting */ add bl, 32 ; /* bits += 32 */ shl rax, cl or rdx, rax ; /* hold |= *((uint *)in)++ << bits */ L_get_length_code: and r8, rdx ; /* r8 &= hold */ mov eax, [rbp+r8*4] ; /* eax = lcode[hold & lmask] */ mov cl, ah ; /* cl = this.bits */ sub bl, ah ; /* bits -= this.bits */ shr rdx, cl ; /* hold >>= this.bits */ test al, al jnz L_test_for_length_base ; /* if (op != 0) 45.7% */ mov r8, r12 ; /* r8 = lmask */ shr eax, 16 ; /* output this.val char */ stosb L_get_length_code_one_time: and r8, rdx ; /* r8 &= hold */ mov eax, [rbp+r8*4] ; /* eax = lcode[hold & lmask] */ L_dolen: mov cl, ah ; /* cl = this.bits */ sub bl, ah ; /* bits -= this.bits */ shr rdx, cl ; /* hold >>= this.bits */ test al, al jnz L_test_for_length_base ; /* if (op != 0) 45.7% */ shr eax, 16 ; /* output this.val char */ stosb jmp L_while_test ALIGN 4 L_test_for_length_base: mov r14d, eax ; /* len = this */ shr r14d, 16 ; /* len = this.val */ mov cl, al test al, 16 jz L_test_for_second_level_length ; /* if ((op & 16) == 0) 8% */ and cl, 15 ; /* op &= 15 */ jz L_decode_distance ; /* if (!op) */ L_add_bits_to_len: sub bl, cl xor eax, eax inc eax shl eax, cl dec eax and eax, edx ; /* eax &= hold */ shr rdx, cl add r14d, eax ; /* len += hold & mask[op] */ L_decode_distance: mov r8, r13 ; /* r8 = dmask */ cmp bl, 32 ja L_get_distance_code ; /* if (32 < bits) */ lodsd ; /* eax = *(uint *)in++ */ mov cl, bl ; /* cl = bits, needs it for shifting */ add bl, 32 ; /* bits += 32 */ shl rax, cl or rdx, rax ; /* hold |= *((uint *)in)++ << bits */ L_get_distance_code: and r8, rdx ; /* r8 &= hold */ mov eax, [r11+r8*4] ; /* eax = dcode[hold & dmask] */ L_dodist: mov r15d, eax ; /* dist = this */ shr r15d, 16 ; /* dist = this.val */ mov cl, ah sub bl, ah ; /* bits -= this.bits */ shr rdx, cl ; /* hold >>= this.bits */ mov cl, al ; /* cl = this.op */ test al, 16 ; /* if ((op & 16) == 0) */ jz L_test_for_second_level_dist and cl, 15 ; /* op &= 15 */ jz L_check_dist_one L_add_bits_to_dist: sub bl, cl xor eax, eax inc eax shl eax, cl dec eax ; /* (1 << op) - 1 */ and eax, edx ; /* eax &= hold */ shr rdx, cl add r15d, eax ; /* dist += hold & ((1 << op) - 1) */ L_check_window: mov r8, rsi ; /* save in so from can use it's reg */ mov rax, rdi sub rax, [rsp+40] ; /* nbytes = out - beg */ cmp eax, r15d jb L_clip_window ; /* if (dist > nbytes) 4.2% */ mov ecx, r14d ; /* ecx = len */ mov rsi, rdi sub rsi, r15 ; /* from = out - dist */ sar ecx, 1 jnc L_copy_two ; /* if len % 2 == 0 */ rep movsw mov al, [rsi] mov [rdi], al inc rdi mov rsi, r8 ; /* move in back to %rsi, toss from */ jmp L_while_test L_copy_two: rep movsw mov rsi, r8 ; /* move in back to %rsi, toss from */ jmp L_while_test ALIGN 4 L_check_dist_one: cmp r15d, 1 ; /* if dist 1, is a memset */ jne L_check_window cmp [rsp+40], rdi ; /* if out == beg, outside window */ je L_check_window mov ecx, r14d ; /* ecx = len */ mov al, [rdi-1] mov ah, al sar ecx, 1 jnc L_set_two mov [rdi], al inc rdi L_set_two: rep stosw jmp L_while_test ALIGN 4 L_test_for_second_level_length: test al, 64 jnz L_test_for_end_of_block ; /* if ((op & 64) != 0) */ xor eax, eax inc eax shl eax, cl dec eax and eax, edx ; /* eax &= hold */ add eax, r14d ; /* eax += len */ mov eax, [rbp+rax*4] ; /* eax = lcode[val+(hold&mask[op])]*/ jmp L_dolen ALIGN 4 L_test_for_second_level_dist: test al, 64 jnz L_invalid_distance_code ; /* if ((op & 64) != 0) */ xor eax, eax inc eax shl eax, cl dec eax and eax, edx ; /* eax &= hold */ add eax, r15d ; /* eax += dist */ mov eax, [r11+rax*4] ; /* eax = dcode[val+(hold&mask[op])]*/ jmp L_dodist ALIGN 4 L_clip_window: mov ecx, eax ; /* ecx = nbytes */ mov eax, [rsp+92] ; /* eax = wsize, prepare for dist cmp */ neg ecx ; /* nbytes = -nbytes */ cmp eax, r15d jb L_invalid_distance_too_far ; /* if (dist > wsize) */ add ecx, r15d ; /* nbytes = dist - nbytes */ cmp dword ptr [rsp+96], 0 jne L_wrap_around_window ; /* if (write != 0) */ mov rsi, [rsp+56] ; /* from = window */ sub eax, ecx ; /* eax -= nbytes */ add rsi, rax ; /* from += wsize - nbytes */ mov eax, r14d ; /* eax = len */ cmp r14d, ecx jbe L_do_copy ; /* if (nbytes >= len) */ sub eax, ecx ; /* eax -= nbytes */ rep movsb mov rsi, rdi sub rsi, r15 ; /* from = &out[ -dist ] */ jmp L_do_copy ALIGN 4 L_wrap_around_window: mov eax, [rsp+96] ; /* eax = write */ cmp ecx, eax jbe L_contiguous_in_window ; /* if (write >= nbytes) */ mov esi, [rsp+92] ; /* from = wsize */ add rsi, [rsp+56] ; /* from += window */ add rsi, rax ; /* from += write */ sub rsi, rcx ; /* from -= nbytes */ sub ecx, eax ; /* nbytes -= write */ mov eax, r14d ; /* eax = len */ cmp eax, ecx jbe L_do_copy ; /* if (nbytes >= len) */ sub eax, ecx ; /* len -= nbytes */ rep movsb mov rsi, [rsp+56] ; /* from = window */ mov ecx, [rsp+96] ; /* nbytes = write */ cmp eax, ecx jbe L_do_copy ; /* if (nbytes >= len) */ sub eax, ecx ; /* len -= nbytes */ rep movsb mov rsi, rdi sub rsi, r15 ; /* from = out - dist */ jmp L_do_copy ALIGN 4 L_contiguous_in_window: mov rsi, [rsp+56] ; /* rsi = window */ add rsi, rax sub rsi, rcx ; /* from += write - nbytes */ mov eax, r14d ; /* eax = len */ cmp eax, ecx jbe L_do_copy ; /* if (nbytes >= len) */ sub eax, ecx ; /* len -= nbytes */ rep movsb mov rsi, rdi sub rsi, r15 ; /* from = out - dist */ jmp L_do_copy ; /* if (nbytes >= len) */ ALIGN 4 L_do_copy: mov ecx, eax ; /* ecx = len */ rep movsb mov rsi, r8 ; /* move in back to %esi, toss from */ jmp L_while_test L_test_for_end_of_block: test al, 32 jz L_invalid_literal_length_code mov dword ptr [rsp+116], 1 jmp L_break_loop_with_status L_invalid_literal_length_code: mov dword ptr [rsp+116], 2 jmp L_break_loop_with_status L_invalid_distance_code: mov dword ptr [rsp+116], 3 jmp L_break_loop_with_status L_invalid_distance_too_far: mov dword ptr [rsp+116], 4 jmp L_break_loop_with_status L_break_loop: mov dword ptr [rsp+116], 0 L_break_loop_with_status: ; /* put in, out, bits, and hold back into ar and pop esp */ mov [rsp+16], rsi ; /* in */ mov [rsp+32], rdi ; /* out */ mov [rsp+88], ebx ; /* bits */ mov [rsp+80], rdx ; /* hold */ mov rax, [rsp] ; /* restore rbp and rsp */ mov rbp, [rsp+8] mov rsp, rax mov rsi,[rsp-8] mov rdi,[rsp-16] mov r12,[rsp-24] mov r13,[rsp-32] mov r14,[rsp-40] mov r15,[rsp-48] mov rbx,[rsp-56] ret 0 ; : ; : "m" (ar) ; : "memory", "%rax", "%rbx", "%rcx", "%rdx", "%rsi", "%rdi", ; "%r8", "%r9", "%r10", "%r11", "%r12", "%r13", "%r14", "%r15" ; ); inffas8664fnc ENDP ;_TEXT ENDS END