You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
1368 lines
42 KiB
1368 lines
42 KiB
/*
|
|
* 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 <[email protected]>
|
|
* 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
|