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; inffasx64.asm is a hand tuned assembler version of inffast.c - fast decoding
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; version for AMD64 on Windows using Microsoft C compiler
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; inffasx64.asm is automatically convert from AMD64 portion of inffas86.c
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; inffasx64.asm is called by inffas8664.c, which contain more info.
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; to compile this file, I use option
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; ml64.exe /Flinffasx64 /c /Zi inffasx64.asm
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; with Microsoft Macro Assembler (x64) for AMD64
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; This file compile with Microsoft Macro Assembler (x64) for AMD64
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; ml64.exe is given with Visual Studio 2005/2008/2010 and Windows WDK
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; (you can get Windows WDK with ml64 for AMD64 from
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; http://www.microsoft.com/whdc/Devtools/wdk/default.mspx for low price)
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; see http://weblogs.asp.net/oldnewthing/archive/2004/01/14/58579.aspx and
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; http://msdn.microsoft.com/library/en-us/kmarch/hh/kmarch/64bitAMD_8e951dd2-ee77-4728-8702-55ce4b5dd24a.xml.asp
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; All registers must be preserved across the call, except for
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; rax, rcx, rdx, r8, r-9, r10, and r11, which are scratch.
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mov [rax+8], rbp ; /* save regs rbp and rsp */
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mov rsp, rax ; /* make rsp point to &ar */
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mov rsi, [rsp+16] ; /* rsi = in */
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mov rdi, [rsp+32] ; /* rdi = out */
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mov r9, [rsp+24] ; /* r9 = last */
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mov r10, [rsp+48] ; /* r10 = end */
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mov rbp, [rsp+64] ; /* rbp = lcode */
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mov r11, [rsp+72] ; /* r11 = dcode */
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mov rdx, [rsp+80] ; /* rdx = hold */
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mov ebx, [rsp+88] ; /* ebx = bits */
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mov r12d, [rsp+100] ; /* r12d = lmask */
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mov r13d, [rsp+104] ; /* r13d = dmask */
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je L_one_time ; /* if only one decode left */
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mov r8, r12 ; /* r8 = lmask */
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ja L_get_length_code_one_time
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lodsd ; /* eax = *(uint *)in++ */
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mov cl, bl ; /* cl = bits, needs it for shifting */
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add bl, 32 ; /* bits += 32 */
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or rdx, rax ; /* hold |= *((uint *)in)++ << bits */
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jmp L_get_length_code_one_time
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mov r8, r12 ; /* r8 = lmask */
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ja L_get_length_code ; /* if (32 < bits) */
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lodsd ; /* eax = *(uint *)in++ */
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mov cl, bl ; /* cl = bits, needs it for shifting */
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add bl, 32 ; /* bits += 32 */
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or rdx, rax ; /* hold |= *((uint *)in)++ << bits */
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and r8, rdx ; /* r8 &= hold */
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mov eax, [rbp+r8*4] ; /* eax = lcode[hold & lmask] */
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mov cl, ah ; /* cl = this.bits */
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sub bl, ah ; /* bits -= this.bits */
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shr rdx, cl ; /* hold >>= this.bits */
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jnz L_test_for_length_base ; /* if (op != 0) 45.7% */
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mov r8, r12 ; /* r8 = lmask */
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shr eax, 16 ; /* output this.val char */
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L_get_length_code_one_time:
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and r8, rdx ; /* r8 &= hold */
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mov eax, [rbp+r8*4] ; /* eax = lcode[hold & lmask] */
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mov cl, ah ; /* cl = this.bits */
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sub bl, ah ; /* bits -= this.bits */
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shr rdx, cl ; /* hold >>= this.bits */
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jnz L_test_for_length_base ; /* if (op != 0) 45.7% */
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shr eax, 16 ; /* output this.val char */
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L_test_for_length_base:
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mov r14d, eax ; /* len = this */
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shr r14d, 16 ; /* len = this.val */
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jz L_test_for_second_level_length ; /* if ((op & 16) == 0) 8% */
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and cl, 15 ; /* op &= 15 */
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jz L_decode_distance ; /* if (!op) */
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and eax, edx ; /* eax &= hold */
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add r14d, eax ; /* len += hold & mask[op] */
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mov r8, r13 ; /* r8 = dmask */
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ja L_get_distance_code ; /* if (32 < bits) */
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lodsd ; /* eax = *(uint *)in++ */
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mov cl, bl ; /* cl = bits, needs it for shifting */
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add bl, 32 ; /* bits += 32 */
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or rdx, rax ; /* hold |= *((uint *)in)++ << bits */
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and r8, rdx ; /* r8 &= hold */
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mov eax, [r11+r8*4] ; /* eax = dcode[hold & dmask] */
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mov r15d, eax ; /* dist = this */
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shr r15d, 16 ; /* dist = this.val */
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sub bl, ah ; /* bits -= this.bits */
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shr rdx, cl ; /* hold >>= this.bits */
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mov cl, al ; /* cl = this.op */
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test al, 16 ; /* if ((op & 16) == 0) */
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jz L_test_for_second_level_dist
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and cl, 15 ; /* op &= 15 */
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dec eax ; /* (1 << op) - 1 */
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and eax, edx ; /* eax &= hold */
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add r15d, eax ; /* dist += hold & ((1 << op) - 1) */
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mov r8, rsi ; /* save in so from can use it's reg */
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sub rax, [rsp+40] ; /* nbytes = out - beg */
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jb L_clip_window ; /* if (dist > nbytes) 4.2% */
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mov ecx, r14d ; /* ecx = len */
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sub rsi, r15 ; /* from = out - dist */
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jnc L_copy_two ; /* if len % 2 == 0 */
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mov rsi, r8 ; /* move in back to %rsi, toss from */
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mov rsi, r8 ; /* move in back to %rsi, toss from */
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cmp r15d, 1 ; /* if dist 1, is a memset */
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cmp [rsp+40], rdi ; /* if out == beg, outside window */
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mov ecx, r14d ; /* ecx = len */
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L_test_for_second_level_length:
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jnz L_test_for_end_of_block ; /* if ((op & 64) != 0) */
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and eax, edx ; /* eax &= hold */
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add eax, r14d ; /* eax += len */
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mov eax, [rbp+rax*4] ; /* eax = lcode[val+(hold&mask[op])]*/
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L_test_for_second_level_dist:
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jnz L_invalid_distance_code ; /* if ((op & 64) != 0) */
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and eax, edx ; /* eax &= hold */
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add eax, r15d ; /* eax += dist */
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mov eax, [r11+rax*4] ; /* eax = dcode[val+(hold&mask[op])]*/
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mov ecx, eax ; /* ecx = nbytes */
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mov eax, [rsp+92] ; /* eax = wsize, prepare for dist cmp */
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neg ecx ; /* nbytes = -nbytes */
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jb L_invalid_distance_too_far ; /* if (dist > wsize) */
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add ecx, r15d ; /* nbytes = dist - nbytes */
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cmp dword ptr [rsp+96], 0
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jne L_wrap_around_window ; /* if (write != 0) */
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mov rsi, [rsp+56] ; /* from = window */
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sub eax, ecx ; /* eax -= nbytes */
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add rsi, rax ; /* from += wsize - nbytes */
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mov eax, r14d ; /* eax = len */
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jbe L_do_copy ; /* if (nbytes >= len) */
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sub eax, ecx ; /* eax -= nbytes */
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sub rsi, r15 ; /* from = &out[ -dist ] */
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L_wrap_around_window:
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mov eax, [rsp+96] ; /* eax = write */
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jbe L_contiguous_in_window ; /* if (write >= nbytes) */
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mov esi, [rsp+92] ; /* from = wsize */
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add rsi, [rsp+56] ; /* from += window */
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add rsi, rax ; /* from += write */
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sub rsi, rcx ; /* from -= nbytes */
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sub ecx, eax ; /* nbytes -= write */
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mov eax, r14d ; /* eax = len */
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jbe L_do_copy ; /* if (nbytes >= len) */
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sub eax, ecx ; /* len -= nbytes */
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mov rsi, [rsp+56] ; /* from = window */
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mov ecx, [rsp+96] ; /* nbytes = write */
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jbe L_do_copy ; /* if (nbytes >= len) */
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sub eax, ecx ; /* len -= nbytes */
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sub rsi, r15 ; /* from = out - dist */
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L_contiguous_in_window:
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mov rsi, [rsp+56] ; /* rsi = window */
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sub rsi, rcx ; /* from += write - nbytes */
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mov eax, r14d ; /* eax = len */
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jbe L_do_copy ; /* if (nbytes >= len) */
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sub eax, ecx ; /* len -= nbytes */
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sub rsi, r15 ; /* from = out - dist */
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jmp L_do_copy ; /* if (nbytes >= len) */
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mov ecx, eax ; /* ecx = len */
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mov rsi, r8 ; /* move in back to %esi, toss from */
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L_test_for_end_of_block:
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jz L_invalid_literal_length_code
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mov dword ptr [rsp+116], 1
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jmp L_break_loop_with_status
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L_invalid_literal_length_code:
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mov dword ptr [rsp+116], 2
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jmp L_break_loop_with_status
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L_invalid_distance_code:
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mov dword ptr [rsp+116], 3
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jmp L_break_loop_with_status
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L_invalid_distance_too_far:
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mov dword ptr [rsp+116], 4
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jmp L_break_loop_with_status
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mov dword ptr [rsp+116], 0
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L_break_loop_with_status:
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; /* put in, out, bits, and hold back into ar and pop esp */
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mov [rsp+16], rsi ; /* in */
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mov [rsp+32], rdi ; /* out */
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mov [rsp+88], ebx ; /* bits */
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mov [rsp+80], rdx ; /* hold */
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mov rax, [rsp] ; /* restore rbp and rsp */
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; : "memory", "%rax", "%rbx", "%rcx", "%rdx", "%rsi", "%rdi",
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; "%r8", "%r9", "%r10", "%r11", "%r12", "%r13", "%r14", "%r15"
added
removed
examples/zlibwrap/zlib/contrib/masmx64/inffasx64.asm
