Chris@4: /* Chris@4: * inffast.S is a hand tuned assembler version of: Chris@4: * Chris@4: * inffast.c -- fast decoding Chris@4: * Copyright (C) 1995-2003 Mark Adler Chris@4: * For conditions of distribution and use, see copyright notice in zlib.h Chris@4: * Chris@4: * Copyright (C) 2003 Chris Anderson Chris@4: * Please use the copyright conditions above. Chris@4: * Chris@4: * This version (Jan-23-2003) of inflate_fast was coded and tested under Chris@4: * GNU/Linux on a pentium 3, using the gcc-3.2 compiler distribution. On that Chris@4: * machine, I found that gzip style archives decompressed about 20% faster than Chris@4: * the gcc-3.2 -O3 -fomit-frame-pointer compiled version. Your results will Chris@4: * depend on how large of a buffer is used for z_stream.next_in & next_out Chris@4: * (8K-32K worked best for my 256K cpu cache) and how much overhead there is in Chris@4: * stream processing I/O and crc32/addler32. In my case, this routine used Chris@4: * 70% of the cpu time and crc32 used 20%. Chris@4: * Chris@4: * I am confident that this version will work in the general case, but I have Chris@4: * not tested a wide variety of datasets or a wide variety of platforms. Chris@4: * Chris@4: * Jan-24-2003 -- Added -DUSE_MMX define for slightly faster inflating. Chris@4: * It should be a runtime flag instead of compile time flag... Chris@4: * Chris@4: * Jan-26-2003 -- Added runtime check for MMX support with cpuid instruction. Chris@4: * With -DUSE_MMX, only MMX code is compiled. With -DNO_MMX, only non-MMX code Chris@4: * is compiled. Without either option, runtime detection is enabled. Runtime Chris@4: * detection should work on all modern cpus and the recomended algorithm (flip Chris@4: * ID bit on eflags and then use the cpuid instruction) is used in many Chris@4: * multimedia applications. Tested under win2k with gcc-2.95 and gas-2.12 Chris@4: * distributed with cygwin3. Compiling with gcc-2.95 -c inffast.S -o Chris@4: * inffast.obj generates a COFF object which can then be linked with MSVC++ Chris@4: * compiled code. Tested under FreeBSD 4.7 with gcc-2.95. Chris@4: * Chris@4: * Jan-28-2003 -- Tested Athlon XP... MMX mode is slower than no MMX (and Chris@4: * slower than compiler generated code). Adjusted cpuid check to use the MMX Chris@4: * code only for Pentiums < P4 until I have more data on the P4. Speed Chris@4: * improvment is only about 15% on the Athlon when compared with code generated Chris@4: * with MSVC++. Not sure yet, but I think the P4 will also be slower using the Chris@4: * MMX mode because many of it's x86 ALU instructions execute in .5 cycles and Chris@4: * have less latency than MMX ops. Added code to buffer the last 11 bytes of Chris@4: * the input stream since the MMX code grabs bits in chunks of 32, which Chris@4: * differs from the inffast.c algorithm. I don't think there would have been Chris@4: * read overruns where a page boundary was crossed (a segfault), but there Chris@4: * could have been overruns when next_in ends on unaligned memory (unintialized Chris@4: * memory read). Chris@4: * Chris@4: * Mar-13-2003 -- P4 MMX is slightly slower than P4 NO_MMX. I created a C Chris@4: * version of the non-MMX code so that it doesn't depend on zstrm and zstate Chris@4: * structure offsets which are hard coded in this file. This was last tested Chris@4: * with zlib-1.2.0 which is currently in beta testing, newer versions of this Chris@4: * and inffas86.c can be found at http://www.eetbeetee.com/zlib/ and Chris@4: * http://www.charm.net/~christop/zlib/ Chris@4: */ Chris@4: Chris@4: Chris@4: /* Chris@4: * if you have underscore linking problems (_inflate_fast undefined), try Chris@4: * using -DGAS_COFF Chris@4: */ Chris@4: #if ! defined( GAS_COFF ) && ! defined( GAS_ELF ) Chris@4: Chris@4: #if defined( WIN32 ) || defined( __CYGWIN__ ) Chris@4: #define GAS_COFF /* windows object format */ Chris@4: #else Chris@4: #define GAS_ELF Chris@4: #endif Chris@4: Chris@4: #endif /* ! GAS_COFF && ! GAS_ELF */ Chris@4: Chris@4: Chris@4: #if defined( GAS_COFF ) Chris@4: Chris@4: /* coff externals have underscores */ Chris@4: #define inflate_fast _inflate_fast Chris@4: #define inflate_fast_use_mmx _inflate_fast_use_mmx Chris@4: Chris@4: #endif /* GAS_COFF */ Chris@4: Chris@4: Chris@4: .file "inffast.S" Chris@4: Chris@4: .globl inflate_fast Chris@4: Chris@4: .text Chris@4: .align 4,0 Chris@4: .L_invalid_literal_length_code_msg: Chris@4: .string "invalid literal/length code" Chris@4: Chris@4: .align 4,0 Chris@4: .L_invalid_distance_code_msg: Chris@4: .string "invalid distance code" Chris@4: Chris@4: .align 4,0 Chris@4: .L_invalid_distance_too_far_msg: Chris@4: .string "invalid distance too far back" Chris@4: Chris@4: #if ! defined( NO_MMX ) Chris@4: .align 4,0 Chris@4: .L_mask: /* mask[N] = ( 1 << N ) - 1 */ Chris@4: .long 0 Chris@4: .long 1 Chris@4: .long 3 Chris@4: .long 7 Chris@4: .long 15 Chris@4: .long 31 Chris@4: .long 63 Chris@4: .long 127 Chris@4: .long 255 Chris@4: .long 511 Chris@4: .long 1023 Chris@4: .long 2047 Chris@4: .long 4095 Chris@4: .long 8191 Chris@4: .long 16383 Chris@4: .long 32767 Chris@4: .long 65535 Chris@4: .long 131071 Chris@4: .long 262143 Chris@4: .long 524287 Chris@4: .long 1048575 Chris@4: .long 2097151 Chris@4: .long 4194303 Chris@4: .long 8388607 Chris@4: .long 16777215 Chris@4: .long 33554431 Chris@4: .long 67108863 Chris@4: .long 134217727 Chris@4: .long 268435455 Chris@4: .long 536870911 Chris@4: .long 1073741823 Chris@4: .long 2147483647 Chris@4: .long 4294967295 Chris@4: #endif /* NO_MMX */ Chris@4: Chris@4: .text Chris@4: Chris@4: /* Chris@4: * struct z_stream offsets, in zlib.h Chris@4: */ Chris@4: #define next_in_strm 0 /* strm->next_in */ Chris@4: #define avail_in_strm 4 /* strm->avail_in */ Chris@4: #define next_out_strm 12 /* strm->next_out */ Chris@4: #define avail_out_strm 16 /* strm->avail_out */ Chris@4: #define msg_strm 24 /* strm->msg */ Chris@4: #define state_strm 28 /* strm->state */ Chris@4: Chris@4: /* Chris@4: * struct inflate_state offsets, in inflate.h Chris@4: */ Chris@4: #define mode_state 0 /* state->mode */ Chris@4: #define wsize_state 32 /* state->wsize */ Chris@4: #define write_state 40 /* state->write */ Chris@4: #define window_state 44 /* state->window */ Chris@4: #define hold_state 48 /* state->hold */ Chris@4: #define bits_state 52 /* state->bits */ Chris@4: #define lencode_state 68 /* state->lencode */ Chris@4: #define distcode_state 72 /* state->distcode */ Chris@4: #define lenbits_state 76 /* state->lenbits */ Chris@4: #define distbits_state 80 /* state->distbits */ Chris@4: Chris@4: /* Chris@4: * inflate_fast's activation record Chris@4: */ Chris@4: #define local_var_size 64 /* how much local space for vars */ Chris@4: #define strm_sp 88 /* first arg: z_stream * (local_var_size + 24) */ Chris@4: #define start_sp 92 /* second arg: unsigned int (local_var_size + 28) */ Chris@4: Chris@4: /* Chris@4: * offsets for local vars on stack Chris@4: */ Chris@4: #define out 60 /* unsigned char* */ Chris@4: #define window 56 /* unsigned char* */ Chris@4: #define wsize 52 /* unsigned int */ Chris@4: #define write 48 /* unsigned int */ Chris@4: #define in 44 /* unsigned char* */ Chris@4: #define beg 40 /* unsigned char* */ Chris@4: #define buf 28 /* char[ 12 ] */ Chris@4: #define len 24 /* unsigned int */ Chris@4: #define last 20 /* unsigned char* */ Chris@4: #define end 16 /* unsigned char* */ Chris@4: #define dcode 12 /* code* */ Chris@4: #define lcode 8 /* code* */ Chris@4: #define dmask 4 /* unsigned int */ Chris@4: #define lmask 0 /* unsigned int */ Chris@4: Chris@4: /* Chris@4: * typedef enum inflate_mode consts, in inflate.h Chris@4: */ Chris@4: #define INFLATE_MODE_TYPE 11 /* state->mode flags enum-ed in inflate.h */ Chris@4: #define INFLATE_MODE_BAD 26 Chris@4: Chris@4: Chris@4: #if ! defined( USE_MMX ) && ! defined( NO_MMX ) Chris@4: Chris@4: #define RUN_TIME_MMX Chris@4: Chris@4: #define CHECK_MMX 1 Chris@4: #define DO_USE_MMX 2 Chris@4: #define DONT_USE_MMX 3 Chris@4: Chris@4: .globl inflate_fast_use_mmx Chris@4: Chris@4: .data Chris@4: Chris@4: .align 4,0 Chris@4: inflate_fast_use_mmx: /* integer flag for run time control 1=check,2=mmx,3=no */ Chris@4: .long CHECK_MMX Chris@4: Chris@4: #if defined( GAS_ELF ) Chris@4: /* elf info */ Chris@4: .type inflate_fast_use_mmx,@object Chris@4: .size inflate_fast_use_mmx,4 Chris@4: #endif Chris@4: Chris@4: #endif /* RUN_TIME_MMX */ Chris@4: Chris@4: #if defined( GAS_COFF ) Chris@4: /* coff info: scl 2 = extern, type 32 = function */ Chris@4: .def inflate_fast; .scl 2; .type 32; .endef Chris@4: #endif Chris@4: Chris@4: .text Chris@4: Chris@4: .align 32,0x90 Chris@4: inflate_fast: Chris@4: pushl %edi Chris@4: pushl %esi Chris@4: pushl %ebp Chris@4: pushl %ebx Chris@4: pushf /* save eflags (strm_sp, state_sp assumes this is 32 bits) */ Chris@4: subl $local_var_size, %esp Chris@4: cld Chris@4: Chris@4: #define strm_r %esi Chris@4: #define state_r %edi Chris@4: Chris@4: movl strm_sp(%esp), strm_r Chris@4: movl state_strm(strm_r), state_r Chris@4: Chris@4: /* in = strm->next_in; Chris@4: * out = strm->next_out; Chris@4: * last = in + strm->avail_in - 11; Chris@4: * beg = out - (start - strm->avail_out); Chris@4: * end = out + (strm->avail_out - 257); Chris@4: */ Chris@4: movl avail_in_strm(strm_r), %edx Chris@4: movl next_in_strm(strm_r), %eax Chris@4: Chris@4: addl %eax, %edx /* avail_in += next_in */ Chris@4: subl $11, %edx /* avail_in -= 11 */ Chris@4: Chris@4: movl %eax, in(%esp) Chris@4: movl %edx, last(%esp) Chris@4: Chris@4: movl start_sp(%esp), %ebp Chris@4: movl avail_out_strm(strm_r), %ecx Chris@4: movl next_out_strm(strm_r), %ebx Chris@4: Chris@4: subl %ecx, %ebp /* start -= avail_out */ Chris@4: negl %ebp /* start = -start */ Chris@4: addl %ebx, %ebp /* start += next_out */ Chris@4: Chris@4: subl $257, %ecx /* avail_out -= 257 */ Chris@4: addl %ebx, %ecx /* avail_out += out */ Chris@4: Chris@4: movl %ebx, out(%esp) Chris@4: movl %ebp, beg(%esp) Chris@4: movl %ecx, end(%esp) Chris@4: Chris@4: /* wsize = state->wsize; Chris@4: * write = state->write; Chris@4: * window = state->window; Chris@4: * hold = state->hold; Chris@4: * bits = state->bits; Chris@4: * lcode = state->lencode; Chris@4: * dcode = state->distcode; Chris@4: * lmask = ( 1 << state->lenbits ) - 1; Chris@4: * dmask = ( 1 << state->distbits ) - 1; Chris@4: */ Chris@4: Chris@4: movl lencode_state(state_r), %eax Chris@4: movl distcode_state(state_r), %ecx Chris@4: Chris@4: movl %eax, lcode(%esp) Chris@4: movl %ecx, dcode(%esp) Chris@4: Chris@4: movl $1, %eax Chris@4: movl lenbits_state(state_r), %ecx Chris@4: shll %cl, %eax Chris@4: decl %eax Chris@4: movl %eax, lmask(%esp) Chris@4: Chris@4: movl $1, %eax Chris@4: movl distbits_state(state_r), %ecx Chris@4: shll %cl, %eax Chris@4: decl %eax Chris@4: movl %eax, dmask(%esp) Chris@4: Chris@4: movl wsize_state(state_r), %eax Chris@4: movl write_state(state_r), %ecx Chris@4: movl window_state(state_r), %edx Chris@4: Chris@4: movl %eax, wsize(%esp) Chris@4: movl %ecx, write(%esp) Chris@4: movl %edx, window(%esp) Chris@4: Chris@4: movl hold_state(state_r), %ebp Chris@4: movl bits_state(state_r), %ebx Chris@4: Chris@4: #undef strm_r Chris@4: #undef state_r Chris@4: Chris@4: #define in_r %esi Chris@4: #define from_r %esi Chris@4: #define out_r %edi Chris@4: Chris@4: movl in(%esp), in_r Chris@4: movl last(%esp), %ecx Chris@4: cmpl in_r, %ecx Chris@4: ja .L_align_long /* if in < last */ Chris@4: Chris@4: addl $11, %ecx /* ecx = &in[ avail_in ] */ Chris@4: subl in_r, %ecx /* ecx = avail_in */ Chris@4: movl $12, %eax Chris@4: subl %ecx, %eax /* eax = 12 - avail_in */ Chris@4: leal buf(%esp), %edi Chris@4: rep movsb /* memcpy( buf, in, avail_in ) */ Chris@4: movl %eax, %ecx Chris@4: xorl %eax, %eax Chris@4: rep stosb /* memset( &buf[ avail_in ], 0, 12 - avail_in ) */ Chris@4: leal buf(%esp), in_r /* in = buf */ Chris@4: movl in_r, last(%esp) /* last = in, do just one iteration */ Chris@4: jmp .L_is_aligned Chris@4: Chris@4: /* align in_r on long boundary */ Chris@4: .L_align_long: Chris@4: testl $3, in_r Chris@4: jz .L_is_aligned Chris@4: xorl %eax, %eax Chris@4: movb (in_r), %al Chris@4: incl in_r Chris@4: movl %ebx, %ecx Chris@4: addl $8, %ebx Chris@4: shll %cl, %eax Chris@4: orl %eax, %ebp Chris@4: jmp .L_align_long Chris@4: Chris@4: .L_is_aligned: Chris@4: movl out(%esp), out_r Chris@4: Chris@4: #if defined( NO_MMX ) Chris@4: jmp .L_do_loop Chris@4: #endif Chris@4: Chris@4: #if defined( USE_MMX ) Chris@4: jmp .L_init_mmx Chris@4: #endif Chris@4: Chris@4: /*** Runtime MMX check ***/ Chris@4: Chris@4: #if defined( RUN_TIME_MMX ) Chris@4: .L_check_mmx: Chris@4: cmpl $DO_USE_MMX, inflate_fast_use_mmx Chris@4: je .L_init_mmx Chris@4: ja .L_do_loop /* > 2 */ Chris@4: Chris@4: pushl %eax Chris@4: pushl %ebx Chris@4: pushl %ecx Chris@4: pushl %edx Chris@4: pushf Chris@4: movl (%esp), %eax /* copy eflags to eax */ Chris@4: xorl $0x200000, (%esp) /* try toggling ID bit of eflags (bit 21) Chris@4: * to see if cpu supports cpuid... Chris@4: * ID bit method not supported by NexGen but Chris@4: * bios may load a cpuid instruction and Chris@4: * cpuid may be disabled on Cyrix 5-6x86 */ Chris@4: popf Chris@4: pushf Chris@4: popl %edx /* copy new eflags to edx */ Chris@4: xorl %eax, %edx /* test if ID bit is flipped */ Chris@4: jz .L_dont_use_mmx /* not flipped if zero */ Chris@4: xorl %eax, %eax Chris@4: cpuid Chris@4: cmpl $0x756e6547, %ebx /* check for GenuineIntel in ebx,ecx,edx */ Chris@4: jne .L_dont_use_mmx Chris@4: cmpl $0x6c65746e, %ecx Chris@4: jne .L_dont_use_mmx Chris@4: cmpl $0x49656e69, %edx Chris@4: jne .L_dont_use_mmx Chris@4: movl $1, %eax Chris@4: cpuid /* get cpu features */ Chris@4: shrl $8, %eax Chris@4: andl $15, %eax Chris@4: cmpl $6, %eax /* check for Pentium family, is 0xf for P4 */ Chris@4: jne .L_dont_use_mmx Chris@4: testl $0x800000, %edx /* test if MMX feature is set (bit 23) */ Chris@4: jnz .L_use_mmx Chris@4: jmp .L_dont_use_mmx Chris@4: .L_use_mmx: Chris@4: movl $DO_USE_MMX, inflate_fast_use_mmx Chris@4: jmp .L_check_mmx_pop Chris@4: .L_dont_use_mmx: Chris@4: movl $DONT_USE_MMX, inflate_fast_use_mmx Chris@4: .L_check_mmx_pop: Chris@4: popl %edx Chris@4: popl %ecx Chris@4: popl %ebx Chris@4: popl %eax Chris@4: jmp .L_check_mmx Chris@4: #endif Chris@4: Chris@4: Chris@4: /*** Non-MMX code ***/ Chris@4: Chris@4: #if defined ( NO_MMX ) || defined( RUN_TIME_MMX ) Chris@4: Chris@4: #define hold_r %ebp Chris@4: #define bits_r %bl Chris@4: #define bitslong_r %ebx Chris@4: Chris@4: .align 32,0x90 Chris@4: .L_while_test: Chris@4: /* while (in < last && out < end) Chris@4: */ Chris@4: cmpl out_r, end(%esp) Chris@4: jbe .L_break_loop /* if (out >= end) */ Chris@4: Chris@4: cmpl in_r, last(%esp) Chris@4: jbe .L_break_loop Chris@4: Chris@4: .L_do_loop: Chris@4: /* regs: %esi = in, %ebp = hold, %bl = bits, %edi = out Chris@4: * Chris@4: * do { Chris@4: * if (bits < 15) { Chris@4: * hold |= *((unsigned short *)in)++ << bits; Chris@4: * bits += 16 Chris@4: * } Chris@4: * this = lcode[hold & lmask] Chris@4: */ Chris@4: cmpb $15, bits_r Chris@4: ja .L_get_length_code /* if (15 < bits) */ Chris@4: Chris@4: xorl %eax, %eax Chris@4: lodsw /* al = *(ushort *)in++ */ Chris@4: movb bits_r, %cl /* cl = bits, needs it for shifting */ Chris@4: addb $16, bits_r /* bits += 16 */ Chris@4: shll %cl, %eax Chris@4: orl %eax, hold_r /* hold |= *((ushort *)in)++ << bits */ Chris@4: Chris@4: .L_get_length_code: Chris@4: movl lmask(%esp), %edx /* edx = lmask */ Chris@4: movl lcode(%esp), %ecx /* ecx = lcode */ Chris@4: andl hold_r, %edx /* edx &= hold */ Chris@4: movl (%ecx,%edx,4), %eax /* eax = lcode[hold & lmask] */ Chris@4: Chris@4: .L_dolen: Chris@4: /* regs: %esi = in, %ebp = hold, %bl = bits, %edi = out Chris@4: * Chris@4: * dolen: Chris@4: * bits -= this.bits; Chris@4: * hold >>= this.bits Chris@4: */ Chris@4: movb %ah, %cl /* cl = this.bits */ Chris@4: subb %ah, bits_r /* bits -= this.bits */ Chris@4: shrl %cl, hold_r /* hold >>= this.bits */ Chris@4: Chris@4: /* check if op is a literal Chris@4: * if (op == 0) { Chris@4: * PUP(out) = this.val; Chris@4: * } Chris@4: */ Chris@4: testb %al, %al Chris@4: jnz .L_test_for_length_base /* if (op != 0) 45.7% */ Chris@4: Chris@4: shrl $16, %eax /* output this.val char */ Chris@4: stosb Chris@4: jmp .L_while_test Chris@4: Chris@4: .L_test_for_length_base: Chris@4: /* regs: %esi = in, %ebp = hold, %bl = bits, %edi = out, %edx = len Chris@4: * Chris@4: * else if (op & 16) { Chris@4: * len = this.val Chris@4: * op &= 15 Chris@4: * if (op) { Chris@4: * if (op > bits) { Chris@4: * hold |= *((unsigned short *)in)++ << bits; Chris@4: * bits += 16 Chris@4: * } Chris@4: * len += hold & mask[op]; Chris@4: * bits -= op; Chris@4: * hold >>= op; Chris@4: * } Chris@4: */ Chris@4: #define len_r %edx Chris@4: movl %eax, len_r /* len = this */ Chris@4: shrl $16, len_r /* len = this.val */ Chris@4: movb %al, %cl Chris@4: Chris@4: testb $16, %al Chris@4: jz .L_test_for_second_level_length /* if ((op & 16) == 0) 8% */ Chris@4: andb $15, %cl /* op &= 15 */ Chris@4: jz .L_save_len /* if (!op) */ Chris@4: cmpb %cl, bits_r Chris@4: jae .L_add_bits_to_len /* if (op <= bits) */ Chris@4: Chris@4: movb %cl, %ch /* stash op in ch, freeing cl */ Chris@4: xorl %eax, %eax Chris@4: lodsw /* al = *(ushort *)in++ */ Chris@4: movb bits_r, %cl /* cl = bits, needs it for shifting */ Chris@4: addb $16, bits_r /* bits += 16 */ Chris@4: shll %cl, %eax Chris@4: orl %eax, hold_r /* hold |= *((ushort *)in)++ << bits */ Chris@4: movb %ch, %cl /* move op back to ecx */ Chris@4: Chris@4: .L_add_bits_to_len: Chris@4: movl $1, %eax Chris@4: shll %cl, %eax Chris@4: decl %eax Chris@4: subb %cl, bits_r Chris@4: andl hold_r, %eax /* eax &= hold */ Chris@4: shrl %cl, hold_r Chris@4: addl %eax, len_r /* len += hold & mask[op] */ Chris@4: Chris@4: .L_save_len: Chris@4: movl len_r, len(%esp) /* save len */ Chris@4: #undef len_r Chris@4: Chris@4: .L_decode_distance: Chris@4: /* regs: %esi = in, %ebp = hold, %bl = bits, %edi = out, %edx = dist Chris@4: * Chris@4: * if (bits < 15) { Chris@4: * hold |= *((unsigned short *)in)++ << bits; Chris@4: * bits += 16 Chris@4: * } Chris@4: * this = dcode[hold & dmask]; Chris@4: * dodist: Chris@4: * bits -= this.bits; Chris@4: * hold >>= this.bits; Chris@4: * op = this.op; Chris@4: */ Chris@4: Chris@4: cmpb $15, bits_r Chris@4: ja .L_get_distance_code /* if (15 < bits) */ Chris@4: Chris@4: xorl %eax, %eax Chris@4: lodsw /* al = *(ushort *)in++ */ Chris@4: movb bits_r, %cl /* cl = bits, needs it for shifting */ Chris@4: addb $16, bits_r /* bits += 16 */ Chris@4: shll %cl, %eax Chris@4: orl %eax, hold_r /* hold |= *((ushort *)in)++ << bits */ Chris@4: Chris@4: .L_get_distance_code: Chris@4: movl dmask(%esp), %edx /* edx = dmask */ Chris@4: movl dcode(%esp), %ecx /* ecx = dcode */ Chris@4: andl hold_r, %edx /* edx &= hold */ Chris@4: movl (%ecx,%edx,4), %eax /* eax = dcode[hold & dmask] */ Chris@4: Chris@4: #define dist_r %edx Chris@4: .L_dodist: Chris@4: movl %eax, dist_r /* dist = this */ Chris@4: shrl $16, dist_r /* dist = this.val */ Chris@4: movb %ah, %cl Chris@4: subb %ah, bits_r /* bits -= this.bits */ Chris@4: shrl %cl, hold_r /* hold >>= this.bits */ Chris@4: Chris@4: /* if (op & 16) { Chris@4: * dist = this.val Chris@4: * op &= 15 Chris@4: * if (op > bits) { Chris@4: * hold |= *((unsigned short *)in)++ << bits; Chris@4: * bits += 16 Chris@4: * } Chris@4: * dist += hold & mask[op]; Chris@4: * bits -= op; Chris@4: * hold >>= op; Chris@4: */ Chris@4: movb %al, %cl /* cl = this.op */ Chris@4: Chris@4: testb $16, %al /* if ((op & 16) == 0) */ Chris@4: jz .L_test_for_second_level_dist Chris@4: andb $15, %cl /* op &= 15 */ Chris@4: jz .L_check_dist_one Chris@4: cmpb %cl, bits_r Chris@4: jae .L_add_bits_to_dist /* if (op <= bits) 97.6% */ Chris@4: Chris@4: movb %cl, %ch /* stash op in ch, freeing cl */ Chris@4: xorl %eax, %eax Chris@4: lodsw /* al = *(ushort *)in++ */ Chris@4: movb bits_r, %cl /* cl = bits, needs it for shifting */ Chris@4: addb $16, bits_r /* bits += 16 */ Chris@4: shll %cl, %eax Chris@4: orl %eax, hold_r /* hold |= *((ushort *)in)++ << bits */ Chris@4: movb %ch, %cl /* move op back to ecx */ Chris@4: Chris@4: .L_add_bits_to_dist: Chris@4: movl $1, %eax Chris@4: shll %cl, %eax Chris@4: decl %eax /* (1 << op) - 1 */ Chris@4: subb %cl, bits_r Chris@4: andl hold_r, %eax /* eax &= hold */ Chris@4: shrl %cl, hold_r Chris@4: addl %eax, dist_r /* dist += hold & ((1 << op) - 1) */ Chris@4: jmp .L_check_window Chris@4: Chris@4: .L_check_window: Chris@4: /* regs: %esi = from, %ebp = hold, %bl = bits, %edi = out, %edx = dist Chris@4: * %ecx = nbytes Chris@4: * Chris@4: * nbytes = out - beg; Chris@4: * if (dist <= nbytes) { Chris@4: * from = out - dist; Chris@4: * do { Chris@4: * PUP(out) = PUP(from); Chris@4: * } while (--len > 0) { Chris@4: * } Chris@4: */ Chris@4: Chris@4: movl in_r, in(%esp) /* save in so from can use it's reg */ Chris@4: movl out_r, %eax Chris@4: subl beg(%esp), %eax /* nbytes = out - beg */ Chris@4: Chris@4: cmpl dist_r, %eax Chris@4: jb .L_clip_window /* if (dist > nbytes) 4.2% */ Chris@4: Chris@4: movl len(%esp), %ecx Chris@4: movl out_r, from_r Chris@4: subl dist_r, from_r /* from = out - dist */ Chris@4: Chris@4: subl $3, %ecx Chris@4: movb (from_r), %al Chris@4: movb %al, (out_r) Chris@4: movb 1(from_r), %al Chris@4: movb 2(from_r), %dl Chris@4: addl $3, from_r Chris@4: movb %al, 1(out_r) Chris@4: movb %dl, 2(out_r) Chris@4: addl $3, out_r Chris@4: rep movsb Chris@4: Chris@4: movl in(%esp), in_r /* move in back to %esi, toss from */ Chris@4: jmp .L_while_test Chris@4: Chris@4: .align 16,0x90 Chris@4: .L_check_dist_one: Chris@4: cmpl $1, dist_r Chris@4: jne .L_check_window Chris@4: cmpl out_r, beg(%esp) Chris@4: je .L_check_window Chris@4: Chris@4: decl out_r Chris@4: movl len(%esp), %ecx Chris@4: movb (out_r), %al Chris@4: subl $3, %ecx Chris@4: Chris@4: movb %al, 1(out_r) Chris@4: movb %al, 2(out_r) Chris@4: movb %al, 3(out_r) Chris@4: addl $4, out_r Chris@4: rep stosb Chris@4: Chris@4: jmp .L_while_test Chris@4: Chris@4: .align 16,0x90 Chris@4: .L_test_for_second_level_length: Chris@4: /* else if ((op & 64) == 0) { Chris@4: * this = lcode[this.val + (hold & mask[op])]; Chris@4: * } Chris@4: */ Chris@4: testb $64, %al Chris@4: jnz .L_test_for_end_of_block /* if ((op & 64) != 0) */ Chris@4: Chris@4: movl $1, %eax Chris@4: shll %cl, %eax Chris@4: decl %eax Chris@4: andl hold_r, %eax /* eax &= hold */ Chris@4: addl %edx, %eax /* eax += this.val */ Chris@4: movl lcode(%esp), %edx /* edx = lcode */ Chris@4: movl (%edx,%eax,4), %eax /* eax = lcode[val + (hold&mask[op])] */ Chris@4: jmp .L_dolen Chris@4: Chris@4: .align 16,0x90 Chris@4: .L_test_for_second_level_dist: Chris@4: /* else if ((op & 64) == 0) { Chris@4: * this = dcode[this.val + (hold & mask[op])]; Chris@4: * } Chris@4: */ Chris@4: testb $64, %al Chris@4: jnz .L_invalid_distance_code /* if ((op & 64) != 0) */ Chris@4: Chris@4: movl $1, %eax Chris@4: shll %cl, %eax Chris@4: decl %eax Chris@4: andl hold_r, %eax /* eax &= hold */ Chris@4: addl %edx, %eax /* eax += this.val */ Chris@4: movl dcode(%esp), %edx /* edx = dcode */ Chris@4: movl (%edx,%eax,4), %eax /* eax = dcode[val + (hold&mask[op])] */ Chris@4: jmp .L_dodist Chris@4: Chris@4: .align 16,0x90 Chris@4: .L_clip_window: Chris@4: /* regs: %esi = from, %ebp = hold, %bl = bits, %edi = out, %edx = dist Chris@4: * %ecx = nbytes Chris@4: * Chris@4: * else { Chris@4: * if (dist > wsize) { Chris@4: * invalid distance Chris@4: * } Chris@4: * from = window; Chris@4: * nbytes = dist - nbytes; Chris@4: * if (write == 0) { Chris@4: * from += wsize - nbytes; Chris@4: */ Chris@4: #define nbytes_r %ecx Chris@4: movl %eax, nbytes_r Chris@4: movl wsize(%esp), %eax /* prepare for dist compare */ Chris@4: negl nbytes_r /* nbytes = -nbytes */ Chris@4: movl window(%esp), from_r /* from = window */ Chris@4: Chris@4: cmpl dist_r, %eax Chris@4: jb .L_invalid_distance_too_far /* if (dist > wsize) */ Chris@4: Chris@4: addl dist_r, nbytes_r /* nbytes = dist - nbytes */ Chris@4: cmpl $0, write(%esp) Chris@4: jne .L_wrap_around_window /* if (write != 0) */ Chris@4: Chris@4: subl nbytes_r, %eax Chris@4: addl %eax, from_r /* from += wsize - nbytes */ Chris@4: Chris@4: /* regs: %esi = from, %ebp = hold, %bl = bits, %edi = out, %edx = dist Chris@4: * %ecx = nbytes, %eax = len Chris@4: * Chris@4: * if (nbytes < len) { Chris@4: * len -= nbytes; Chris@4: * do { Chris@4: * PUP(out) = PUP(from); Chris@4: * } while (--nbytes); Chris@4: * from = out - dist; Chris@4: * } Chris@4: * } Chris@4: */ Chris@4: #define len_r %eax Chris@4: movl len(%esp), len_r Chris@4: cmpl nbytes_r, len_r Chris@4: jbe .L_do_copy1 /* if (nbytes >= len) */ Chris@4: Chris@4: subl nbytes_r, len_r /* len -= nbytes */ Chris@4: rep movsb Chris@4: movl out_r, from_r Chris@4: subl dist_r, from_r /* from = out - dist */ Chris@4: jmp .L_do_copy1 Chris@4: Chris@4: cmpl nbytes_r, len_r Chris@4: jbe .L_do_copy1 /* if (nbytes >= len) */ Chris@4: Chris@4: subl nbytes_r, len_r /* len -= nbytes */ Chris@4: rep movsb Chris@4: movl out_r, from_r Chris@4: subl dist_r, from_r /* from = out - dist */ Chris@4: jmp .L_do_copy1 Chris@4: Chris@4: .L_wrap_around_window: Chris@4: /* regs: %esi = from, %ebp = hold, %bl = bits, %edi = out, %edx = dist Chris@4: * %ecx = nbytes, %eax = write, %eax = len Chris@4: * Chris@4: * else if (write < nbytes) { Chris@4: * from += wsize + write - nbytes; Chris@4: * nbytes -= write; Chris@4: * if (nbytes < len) { Chris@4: * len -= nbytes; Chris@4: * do { Chris@4: * PUP(out) = PUP(from); Chris@4: * } while (--nbytes); Chris@4: * from = window; Chris@4: * nbytes = write; Chris@4: * if (nbytes < len) { Chris@4: * len -= nbytes; Chris@4: * do { Chris@4: * PUP(out) = PUP(from); Chris@4: * } while(--nbytes); Chris@4: * from = out - dist; Chris@4: * } Chris@4: * } Chris@4: * } Chris@4: */ Chris@4: #define write_r %eax Chris@4: movl write(%esp), write_r Chris@4: cmpl write_r, nbytes_r Chris@4: jbe .L_contiguous_in_window /* if (write >= nbytes) */ Chris@4: Chris@4: addl wsize(%esp), from_r Chris@4: addl write_r, from_r Chris@4: subl nbytes_r, from_r /* from += wsize + write - nbytes */ Chris@4: subl write_r, nbytes_r /* nbytes -= write */ Chris@4: #undef write_r Chris@4: Chris@4: movl len(%esp), len_r Chris@4: cmpl nbytes_r, len_r Chris@4: jbe .L_do_copy1 /* if (nbytes >= len) */ Chris@4: Chris@4: subl nbytes_r, len_r /* len -= nbytes */ Chris@4: rep movsb Chris@4: movl window(%esp), from_r /* from = window */ Chris@4: movl write(%esp), nbytes_r /* nbytes = write */ Chris@4: cmpl nbytes_r, len_r Chris@4: jbe .L_do_copy1 /* if (nbytes >= len) */ Chris@4: Chris@4: subl nbytes_r, len_r /* len -= nbytes */ Chris@4: rep movsb Chris@4: movl out_r, from_r Chris@4: subl dist_r, from_r /* from = out - dist */ Chris@4: jmp .L_do_copy1 Chris@4: Chris@4: .L_contiguous_in_window: Chris@4: /* regs: %esi = from, %ebp = hold, %bl = bits, %edi = out, %edx = dist Chris@4: * %ecx = nbytes, %eax = write, %eax = len Chris@4: * Chris@4: * else { Chris@4: * from += write - nbytes; Chris@4: * if (nbytes < len) { Chris@4: * len -= nbytes; Chris@4: * do { Chris@4: * PUP(out) = PUP(from); Chris@4: * } while (--nbytes); Chris@4: * from = out - dist; Chris@4: * } Chris@4: * } Chris@4: */ Chris@4: #define write_r %eax Chris@4: addl write_r, from_r Chris@4: subl nbytes_r, from_r /* from += write - nbytes */ Chris@4: #undef write_r Chris@4: Chris@4: movl len(%esp), len_r Chris@4: cmpl nbytes_r, len_r Chris@4: jbe .L_do_copy1 /* if (nbytes >= len) */ Chris@4: Chris@4: subl nbytes_r, len_r /* len -= nbytes */ Chris@4: rep movsb Chris@4: movl out_r, from_r Chris@4: subl dist_r, from_r /* from = out - dist */ Chris@4: Chris@4: .L_do_copy1: Chris@4: /* regs: %esi = from, %esi = in, %ebp = hold, %bl = bits, %edi = out Chris@4: * %eax = len Chris@4: * Chris@4: * while (len > 0) { Chris@4: * PUP(out) = PUP(from); Chris@4: * len--; Chris@4: * } Chris@4: * } Chris@4: * } while (in < last && out < end); Chris@4: */ Chris@4: #undef nbytes_r Chris@4: #define in_r %esi Chris@4: movl len_r, %ecx Chris@4: rep movsb Chris@4: Chris@4: movl in(%esp), in_r /* move in back to %esi, toss from */ Chris@4: jmp .L_while_test Chris@4: Chris@4: #undef len_r Chris@4: #undef dist_r Chris@4: Chris@4: #endif /* NO_MMX || RUN_TIME_MMX */ Chris@4: Chris@4: Chris@4: /*** MMX code ***/ Chris@4: Chris@4: #if defined( USE_MMX ) || defined( RUN_TIME_MMX ) Chris@4: Chris@4: .align 32,0x90 Chris@4: .L_init_mmx: Chris@4: emms Chris@4: Chris@4: #undef bits_r Chris@4: #undef bitslong_r Chris@4: #define bitslong_r %ebp Chris@4: #define hold_mm %mm0 Chris@4: movd %ebp, hold_mm Chris@4: movl %ebx, bitslong_r Chris@4: Chris@4: #define used_mm %mm1 Chris@4: #define dmask2_mm %mm2 Chris@4: #define lmask2_mm %mm3 Chris@4: #define lmask_mm %mm4 Chris@4: #define dmask_mm %mm5 Chris@4: #define tmp_mm %mm6 Chris@4: Chris@4: movd lmask(%esp), lmask_mm Chris@4: movq lmask_mm, lmask2_mm Chris@4: movd dmask(%esp), dmask_mm Chris@4: movq dmask_mm, dmask2_mm Chris@4: pxor used_mm, used_mm Chris@4: movl lcode(%esp), %ebx /* ebx = lcode */ Chris@4: jmp .L_do_loop_mmx Chris@4: Chris@4: .align 32,0x90 Chris@4: .L_while_test_mmx: Chris@4: /* while (in < last && out < end) Chris@4: */ Chris@4: cmpl out_r, end(%esp) Chris@4: jbe .L_break_loop /* if (out >= end) */ Chris@4: Chris@4: cmpl in_r, last(%esp) Chris@4: jbe .L_break_loop Chris@4: Chris@4: .L_do_loop_mmx: Chris@4: psrlq used_mm, hold_mm /* hold_mm >>= last bit length */ Chris@4: Chris@4: cmpl $32, bitslong_r Chris@4: ja .L_get_length_code_mmx /* if (32 < bits) */ Chris@4: Chris@4: movd bitslong_r, tmp_mm Chris@4: movd (in_r), %mm7 Chris@4: addl $4, in_r Chris@4: psllq tmp_mm, %mm7 Chris@4: addl $32, bitslong_r Chris@4: por %mm7, hold_mm /* hold_mm |= *((uint *)in)++ << bits */ Chris@4: Chris@4: .L_get_length_code_mmx: Chris@4: pand hold_mm, lmask_mm Chris@4: movd lmask_mm, %eax Chris@4: movq lmask2_mm, lmask_mm Chris@4: movl (%ebx,%eax,4), %eax /* eax = lcode[hold & lmask] */ Chris@4: Chris@4: .L_dolen_mmx: Chris@4: movzbl %ah, %ecx /* ecx = this.bits */ Chris@4: movd %ecx, used_mm Chris@4: subl %ecx, bitslong_r /* bits -= this.bits */ Chris@4: Chris@4: testb %al, %al Chris@4: jnz .L_test_for_length_base_mmx /* if (op != 0) 45.7% */ Chris@4: Chris@4: shrl $16, %eax /* output this.val char */ Chris@4: stosb Chris@4: jmp .L_while_test_mmx Chris@4: Chris@4: .L_test_for_length_base_mmx: Chris@4: #define len_r %edx Chris@4: movl %eax, len_r /* len = this */ Chris@4: shrl $16, len_r /* len = this.val */ Chris@4: Chris@4: testb $16, %al Chris@4: jz .L_test_for_second_level_length_mmx /* if ((op & 16) == 0) 8% */ Chris@4: andl $15, %eax /* op &= 15 */ Chris@4: jz .L_decode_distance_mmx /* if (!op) */ Chris@4: Chris@4: psrlq used_mm, hold_mm /* hold_mm >>= last bit length */ Chris@4: movd %eax, used_mm Chris@4: movd hold_mm, %ecx Chris@4: subl %eax, bitslong_r Chris@4: andl .L_mask(,%eax,4), %ecx Chris@4: addl %ecx, len_r /* len += hold & mask[op] */ Chris@4: Chris@4: .L_decode_distance_mmx: Chris@4: psrlq used_mm, hold_mm /* hold_mm >>= last bit length */ Chris@4: Chris@4: cmpl $32, bitslong_r Chris@4: ja .L_get_dist_code_mmx /* if (32 < bits) */ Chris@4: Chris@4: movd bitslong_r, tmp_mm Chris@4: movd (in_r), %mm7 Chris@4: addl $4, in_r Chris@4: psllq tmp_mm, %mm7 Chris@4: addl $32, bitslong_r Chris@4: por %mm7, hold_mm /* hold_mm |= *((uint *)in)++ << bits */ Chris@4: Chris@4: .L_get_dist_code_mmx: Chris@4: movl dcode(%esp), %ebx /* ebx = dcode */ Chris@4: pand hold_mm, dmask_mm Chris@4: movd dmask_mm, %eax Chris@4: movq dmask2_mm, dmask_mm Chris@4: movl (%ebx,%eax,4), %eax /* eax = dcode[hold & lmask] */ Chris@4: Chris@4: .L_dodist_mmx: Chris@4: #define dist_r %ebx Chris@4: movzbl %ah, %ecx /* ecx = this.bits */ Chris@4: movl %eax, dist_r Chris@4: shrl $16, dist_r /* dist = this.val */ Chris@4: subl %ecx, bitslong_r /* bits -= this.bits */ Chris@4: movd %ecx, used_mm Chris@4: Chris@4: testb $16, %al /* if ((op & 16) == 0) */ Chris@4: jz .L_test_for_second_level_dist_mmx Chris@4: andl $15, %eax /* op &= 15 */ Chris@4: jz .L_check_dist_one_mmx Chris@4: Chris@4: .L_add_bits_to_dist_mmx: Chris@4: psrlq used_mm, hold_mm /* hold_mm >>= last bit length */ Chris@4: movd %eax, used_mm /* save bit length of current op */ Chris@4: movd hold_mm, %ecx /* get the next bits on input stream */ Chris@4: subl %eax, bitslong_r /* bits -= op bits */ Chris@4: andl .L_mask(,%eax,4), %ecx /* ecx = hold & mask[op] */ Chris@4: addl %ecx, dist_r /* dist += hold & mask[op] */ Chris@4: Chris@4: .L_check_window_mmx: Chris@4: movl in_r, in(%esp) /* save in so from can use it's reg */ Chris@4: movl out_r, %eax Chris@4: subl beg(%esp), %eax /* nbytes = out - beg */ Chris@4: Chris@4: cmpl dist_r, %eax Chris@4: jb .L_clip_window_mmx /* if (dist > nbytes) 4.2% */ Chris@4: Chris@4: movl len_r, %ecx Chris@4: movl out_r, from_r Chris@4: subl dist_r, from_r /* from = out - dist */ Chris@4: Chris@4: subl $3, %ecx Chris@4: movb (from_r), %al Chris@4: movb %al, (out_r) Chris@4: movb 1(from_r), %al Chris@4: movb 2(from_r), %dl Chris@4: addl $3, from_r Chris@4: movb %al, 1(out_r) Chris@4: movb %dl, 2(out_r) Chris@4: addl $3, out_r Chris@4: rep movsb Chris@4: Chris@4: movl in(%esp), in_r /* move in back to %esi, toss from */ Chris@4: movl lcode(%esp), %ebx /* move lcode back to %ebx, toss dist */ Chris@4: jmp .L_while_test_mmx Chris@4: Chris@4: .align 16,0x90 Chris@4: .L_check_dist_one_mmx: Chris@4: cmpl $1, dist_r Chris@4: jne .L_check_window_mmx Chris@4: cmpl out_r, beg(%esp) Chris@4: je .L_check_window_mmx Chris@4: Chris@4: decl out_r Chris@4: movl len_r, %ecx Chris@4: movb (out_r), %al Chris@4: subl $3, %ecx Chris@4: Chris@4: movb %al, 1(out_r) Chris@4: movb %al, 2(out_r) Chris@4: movb %al, 3(out_r) Chris@4: addl $4, out_r Chris@4: rep stosb Chris@4: Chris@4: movl lcode(%esp), %ebx /* move lcode back to %ebx, toss dist */ Chris@4: jmp .L_while_test_mmx Chris@4: Chris@4: .align 16,0x90 Chris@4: .L_test_for_second_level_length_mmx: Chris@4: testb $64, %al Chris@4: jnz .L_test_for_end_of_block /* if ((op & 64) != 0) */ Chris@4: Chris@4: andl $15, %eax Chris@4: psrlq used_mm, hold_mm /* hold_mm >>= last bit length */ Chris@4: movd hold_mm, %ecx Chris@4: andl .L_mask(,%eax,4), %ecx Chris@4: addl len_r, %ecx Chris@4: movl (%ebx,%ecx,4), %eax /* eax = lcode[hold & lmask] */ Chris@4: jmp .L_dolen_mmx Chris@4: Chris@4: .align 16,0x90 Chris@4: .L_test_for_second_level_dist_mmx: Chris@4: testb $64, %al Chris@4: jnz .L_invalid_distance_code /* if ((op & 64) != 0) */ Chris@4: Chris@4: andl $15, %eax Chris@4: psrlq used_mm, hold_mm /* hold_mm >>= last bit length */ Chris@4: movd hold_mm, %ecx Chris@4: andl .L_mask(,%eax,4), %ecx Chris@4: movl dcode(%esp), %eax /* ecx = dcode */ Chris@4: addl dist_r, %ecx Chris@4: movl (%eax,%ecx,4), %eax /* eax = lcode[hold & lmask] */ Chris@4: jmp .L_dodist_mmx Chris@4: Chris@4: .align 16,0x90 Chris@4: .L_clip_window_mmx: Chris@4: #define nbytes_r %ecx Chris@4: movl %eax, nbytes_r Chris@4: movl wsize(%esp), %eax /* prepare for dist compare */ Chris@4: negl nbytes_r /* nbytes = -nbytes */ Chris@4: movl window(%esp), from_r /* from = window */ Chris@4: Chris@4: cmpl dist_r, %eax Chris@4: jb .L_invalid_distance_too_far /* if (dist > wsize) */ Chris@4: Chris@4: addl dist_r, nbytes_r /* nbytes = dist - nbytes */ Chris@4: cmpl $0, write(%esp) Chris@4: jne .L_wrap_around_window_mmx /* if (write != 0) */ Chris@4: Chris@4: subl nbytes_r, %eax Chris@4: addl %eax, from_r /* from += wsize - nbytes */ Chris@4: Chris@4: cmpl nbytes_r, len_r Chris@4: jbe .L_do_copy1_mmx /* if (nbytes >= len) */ Chris@4: Chris@4: subl nbytes_r, len_r /* len -= nbytes */ Chris@4: rep movsb Chris@4: movl out_r, from_r Chris@4: subl dist_r, from_r /* from = out - dist */ Chris@4: jmp .L_do_copy1_mmx Chris@4: Chris@4: cmpl nbytes_r, len_r Chris@4: jbe .L_do_copy1_mmx /* if (nbytes >= len) */ Chris@4: Chris@4: subl nbytes_r, len_r /* len -= nbytes */ Chris@4: rep movsb Chris@4: movl out_r, from_r Chris@4: subl dist_r, from_r /* from = out - dist */ Chris@4: jmp .L_do_copy1_mmx Chris@4: Chris@4: .L_wrap_around_window_mmx: Chris@4: #define write_r %eax Chris@4: movl write(%esp), write_r Chris@4: cmpl write_r, nbytes_r Chris@4: jbe .L_contiguous_in_window_mmx /* if (write >= nbytes) */ Chris@4: Chris@4: addl wsize(%esp), from_r Chris@4: addl write_r, from_r Chris@4: subl nbytes_r, from_r /* from += wsize + write - nbytes */ Chris@4: subl write_r, nbytes_r /* nbytes -= write */ Chris@4: #undef write_r Chris@4: Chris@4: cmpl nbytes_r, len_r Chris@4: jbe .L_do_copy1_mmx /* if (nbytes >= len) */ Chris@4: Chris@4: subl nbytes_r, len_r /* len -= nbytes */ Chris@4: rep movsb Chris@4: movl window(%esp), from_r /* from = window */ Chris@4: movl write(%esp), nbytes_r /* nbytes = write */ Chris@4: cmpl nbytes_r, len_r Chris@4: jbe .L_do_copy1_mmx /* if (nbytes >= len) */ Chris@4: Chris@4: subl nbytes_r, len_r /* len -= nbytes */ Chris@4: rep movsb Chris@4: movl out_r, from_r Chris@4: subl dist_r, from_r /* from = out - dist */ Chris@4: jmp .L_do_copy1_mmx Chris@4: Chris@4: .L_contiguous_in_window_mmx: Chris@4: #define write_r %eax Chris@4: addl write_r, from_r Chris@4: subl nbytes_r, from_r /* from += write - nbytes */ Chris@4: #undef write_r Chris@4: Chris@4: cmpl nbytes_r, len_r Chris@4: jbe .L_do_copy1_mmx /* if (nbytes >= len) */ Chris@4: Chris@4: subl nbytes_r, len_r /* len -= nbytes */ Chris@4: rep movsb Chris@4: movl out_r, from_r Chris@4: subl dist_r, from_r /* from = out - dist */ Chris@4: Chris@4: .L_do_copy1_mmx: Chris@4: #undef nbytes_r Chris@4: #define in_r %esi Chris@4: movl len_r, %ecx Chris@4: rep movsb Chris@4: Chris@4: movl in(%esp), in_r /* move in back to %esi, toss from */ Chris@4: movl lcode(%esp), %ebx /* move lcode back to %ebx, toss dist */ Chris@4: jmp .L_while_test_mmx Chris@4: Chris@4: #undef hold_r Chris@4: #undef bitslong_r Chris@4: Chris@4: #endif /* USE_MMX || RUN_TIME_MMX */ Chris@4: Chris@4: Chris@4: /*** USE_MMX, NO_MMX, and RUNTIME_MMX from here on ***/ Chris@4: Chris@4: .L_invalid_distance_code: Chris@4: /* else { Chris@4: * strm->msg = "invalid distance code"; Chris@4: * state->mode = BAD; Chris@4: * } Chris@4: */ Chris@4: movl $.L_invalid_distance_code_msg, %ecx Chris@4: movl $INFLATE_MODE_BAD, %edx Chris@4: jmp .L_update_stream_state Chris@4: Chris@4: .L_test_for_end_of_block: Chris@4: /* else if (op & 32) { Chris@4: * state->mode = TYPE; Chris@4: * break; Chris@4: * } Chris@4: */ Chris@4: testb $32, %al Chris@4: jz .L_invalid_literal_length_code /* if ((op & 32) == 0) */ Chris@4: Chris@4: movl $0, %ecx Chris@4: movl $INFLATE_MODE_TYPE, %edx Chris@4: jmp .L_update_stream_state Chris@4: Chris@4: .L_invalid_literal_length_code: Chris@4: /* else { Chris@4: * strm->msg = "invalid literal/length code"; Chris@4: * state->mode = BAD; Chris@4: * } Chris@4: */ Chris@4: movl $.L_invalid_literal_length_code_msg, %ecx Chris@4: movl $INFLATE_MODE_BAD, %edx Chris@4: jmp .L_update_stream_state Chris@4: Chris@4: .L_invalid_distance_too_far: Chris@4: /* strm->msg = "invalid distance too far back"; Chris@4: * state->mode = BAD; Chris@4: */ Chris@4: movl in(%esp), in_r /* from_r has in's reg, put in back */ Chris@4: movl $.L_invalid_distance_too_far_msg, %ecx Chris@4: movl $INFLATE_MODE_BAD, %edx Chris@4: jmp .L_update_stream_state Chris@4: Chris@4: .L_update_stream_state: Chris@4: /* set strm->msg = %ecx, strm->state->mode = %edx */ Chris@4: movl strm_sp(%esp), %eax Chris@4: testl %ecx, %ecx /* if (msg != NULL) */ Chris@4: jz .L_skip_msg Chris@4: movl %ecx, msg_strm(%eax) /* strm->msg = msg */ Chris@4: .L_skip_msg: Chris@4: movl state_strm(%eax), %eax /* state = strm->state */ Chris@4: movl %edx, mode_state(%eax) /* state->mode = edx (BAD | TYPE) */ Chris@4: jmp .L_break_loop Chris@4: Chris@4: .align 32,0x90 Chris@4: .L_break_loop: Chris@4: Chris@4: /* Chris@4: * Regs: Chris@4: * Chris@4: * bits = %ebp when mmx, and in %ebx when non-mmx Chris@4: * hold = %hold_mm when mmx, and in %ebp when non-mmx Chris@4: * in = %esi Chris@4: * out = %edi Chris@4: */ Chris@4: Chris@4: #if defined( USE_MMX ) || defined( RUN_TIME_MMX ) Chris@4: Chris@4: #if defined( RUN_TIME_MMX ) Chris@4: Chris@4: cmpl $DO_USE_MMX, inflate_fast_use_mmx Chris@4: jne .L_update_next_in Chris@4: Chris@4: #endif /* RUN_TIME_MMX */ Chris@4: Chris@4: movl %ebp, %ebx Chris@4: Chris@4: .L_update_next_in: Chris@4: Chris@4: #endif Chris@4: Chris@4: #define strm_r %eax Chris@4: #define state_r %edx Chris@4: Chris@4: /* len = bits >> 3; Chris@4: * in -= len; Chris@4: * bits -= len << 3; Chris@4: * hold &= (1U << bits) - 1; Chris@4: * state->hold = hold; Chris@4: * state->bits = bits; Chris@4: * strm->next_in = in; Chris@4: * strm->next_out = out; Chris@4: */ Chris@4: movl strm_sp(%esp), strm_r Chris@4: movl %ebx, %ecx Chris@4: movl state_strm(strm_r), state_r Chris@4: shrl $3, %ecx Chris@4: subl %ecx, in_r Chris@4: shll $3, %ecx Chris@4: subl %ecx, %ebx Chris@4: movl out_r, next_out_strm(strm_r) Chris@4: movl %ebx, bits_state(state_r) Chris@4: movl %ebx, %ecx Chris@4: Chris@4: leal buf(%esp), %ebx Chris@4: cmpl %ebx, last(%esp) Chris@4: jne .L_buf_not_used /* if buf != last */ Chris@4: Chris@4: subl %ebx, in_r /* in -= buf */ Chris@4: movl next_in_strm(strm_r), %ebx Chris@4: movl %ebx, last(%esp) /* last = strm->next_in */ Chris@4: addl %ebx, in_r /* in += strm->next_in */ Chris@4: movl avail_in_strm(strm_r), %ebx Chris@4: subl $11, %ebx Chris@4: addl %ebx, last(%esp) /* last = &strm->next_in[ avail_in - 11 ] */ Chris@4: Chris@4: .L_buf_not_used: Chris@4: movl in_r, next_in_strm(strm_r) Chris@4: Chris@4: movl $1, %ebx Chris@4: shll %cl, %ebx Chris@4: decl %ebx Chris@4: Chris@4: #if defined( USE_MMX ) || defined( RUN_TIME_MMX ) Chris@4: Chris@4: #if defined( RUN_TIME_MMX ) Chris@4: Chris@4: cmpl $DO_USE_MMX, inflate_fast_use_mmx Chris@4: jne .L_update_hold Chris@4: Chris@4: #endif /* RUN_TIME_MMX */ Chris@4: Chris@4: psrlq used_mm, hold_mm /* hold_mm >>= last bit length */ Chris@4: movd hold_mm, %ebp Chris@4: Chris@4: emms Chris@4: Chris@4: .L_update_hold: Chris@4: Chris@4: #endif /* USE_MMX || RUN_TIME_MMX */ Chris@4: Chris@4: andl %ebx, %ebp Chris@4: movl %ebp, hold_state(state_r) Chris@4: Chris@4: #define last_r %ebx Chris@4: Chris@4: /* strm->avail_in = in < last ? 11 + (last - in) : 11 - (in - last) */ Chris@4: movl last(%esp), last_r Chris@4: cmpl in_r, last_r Chris@4: jbe .L_last_is_smaller /* if (in >= last) */ Chris@4: Chris@4: subl in_r, last_r /* last -= in */ Chris@4: addl $11, last_r /* last += 11 */ Chris@4: movl last_r, avail_in_strm(strm_r) Chris@4: jmp .L_fixup_out Chris@4: .L_last_is_smaller: Chris@4: subl last_r, in_r /* in -= last */ Chris@4: negl in_r /* in = -in */ Chris@4: addl $11, in_r /* in += 11 */ Chris@4: movl in_r, avail_in_strm(strm_r) Chris@4: Chris@4: #undef last_r Chris@4: #define end_r %ebx Chris@4: Chris@4: .L_fixup_out: Chris@4: /* strm->avail_out = out < end ? 257 + (end - out) : 257 - (out - end)*/ Chris@4: movl end(%esp), end_r Chris@4: cmpl out_r, end_r Chris@4: jbe .L_end_is_smaller /* if (out >= end) */ Chris@4: Chris@4: subl out_r, end_r /* end -= out */ Chris@4: addl $257, end_r /* end += 257 */ Chris@4: movl end_r, avail_out_strm(strm_r) Chris@4: jmp .L_done Chris@4: .L_end_is_smaller: Chris@4: subl end_r, out_r /* out -= end */ Chris@4: negl out_r /* out = -out */ Chris@4: addl $257, out_r /* out += 257 */ Chris@4: movl out_r, avail_out_strm(strm_r) Chris@4: Chris@4: #undef end_r Chris@4: #undef strm_r Chris@4: #undef state_r Chris@4: Chris@4: .L_done: Chris@4: addl $local_var_size, %esp Chris@4: popf Chris@4: popl %ebx Chris@4: popl %ebp Chris@4: popl %esi Chris@4: popl %edi Chris@4: ret Chris@4: Chris@4: #if defined( GAS_ELF ) Chris@4: /* elf info */ Chris@4: .type inflate_fast,@function Chris@4: .size inflate_fast,.-inflate_fast Chris@4: #endif