/*
* 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