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