From 7c2a874e50b871d04fbd19501f7b42cff55e5abc Mon Sep 17 00:00:00 2001 From: Mark Adler Date: Fri, 9 Sep 2011 23:21:47 -0700 Subject: zlib 1.2.0 --- contrib/inflate86/inffast.S | 1095 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 1095 insertions(+) create mode 100644 contrib/inflate86/inffast.S (limited to 'contrib/inflate86/inffast.S') diff --git a/contrib/inflate86/inffast.S b/contrib/inflate86/inffast.S new file mode 100644 index 0000000..d1e80ef --- /dev/null +++ b/contrib/inflate86/inffast.S @@ -0,0 +1,1095 @@ +/* + * 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 + * 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... + */ + +.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( USE_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 + +.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 36 /* state->write */ +#define window_state 40 /* state->window */ +#define hold_state 44 /* state->hold */ +#define bits_state 48 /* state->bits */ +#define lencode_state 64 /* state->lencode */ +#define distcode_state 68 /* state->distcode */ +#define lenbits_state 72 /* state->lenbits */ +#define distbits_state 76 /* state->distbits */ + +/* + * inflate_fast's activation record + */ +#define local_var_size 56 /* how much local space for vars */ +#define strm_sp 80 /* first arg: z_stream * (local_var_size + 24) */ +#define start_sp 84 /* second arg: unsigned int (local_var_size + 28) */ + +/* + * offsets for local vars on stack + */ +#define out 52 /* unsigned char* */ +#define window 48 /* unsigned char* */ +#define wsize 44 /* unsigned int */ +#define write 40 /* unsigned int */ +#define in 36 /* unsigned char* */ +#define beg 32 /* unsigned char* */ +#define dist 28 /* unsigned int */ +#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 + */ +#ifndef NO_GUNZIP +#define GUNZIP +#endif + +#ifdef GUNZIP +#define INFLATE_MODE_TYPE 11 /* state->mode flags enum-ed in inflate.h */ +#define INFLATE_MODE_BAD 26 +#else +#define INFLATE_MODE_TYPE 3 +#define INFLATE_MODE_BAD 17 +#endif + + +.align 16,0x90 +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 +#if defined( USE_MMX ) + emms +#endif + +#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 - 5; + * beg = out - (start - strm->avail_out); + * end = out + (strm->avail_out - 257); + */ + movl next_in_strm(strm_r), %eax + movl next_out_strm(strm_r), %ebx + movl avail_in_strm(strm_r), %edx + movl avail_out_strm(strm_r), %ecx + movl start_sp(%esp), %ebp + + addl %eax, %edx /* avail_in += next_in */ + subl $5, %edx /* avail_in -= 5 */ + + 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 %eax, in(%esp) + movl %ebx, out(%esp) + movl %edx, last(%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) + +#if ! defined( USE_MMX ) + +#define hold_r %ebp +#define bits_r %bl +#define bitslong_r %ebx + + movl hold_state(state_r), hold_r + movl bits_state(state_r), bitslong_r + +#else /* USE_MMX */ + +#define hold_mm %mm0 +#define bits_r %ebp +#define bitslong_r %ebp + + movl hold_state(state_r), %ebx + movl bits_state(state_r), bitslong_r + +#endif + +#undef strm_r +#undef state_r +#define in_r %esi +#define from_r %esi +#define out_r %edi + + movl in(%esp), in_r + +#if ! defined ( USE_MMX ) + + /* align in_r on word boundary */ + testl $1, in_r + jz .L_is_aligned + xorl %eax, %eax + movb (in_r), %al + incl in_r + movb bits_r, %cl + addb $8, bits_r + shll %cl, %eax + orl %eax, hold_r + +#else + /* 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 bits_r, %ecx + addl $8, bits_r + shll %cl, %eax + orl %eax, %ebx + jmp .L_align_long + +#endif + +.L_is_aligned: + movl out(%esp), out_r + +#if defined ( USE_MMX ) + +#define used_mm %mm1 +#define dmask2_mm %mm2 +#define lmask2_mm %mm3 +#define lmask_mm %mm4 +#define dmask_mm %mm5 +#define tmp_mm %mm6 + + movl out(%esp), out_r + movd lmask(%esp), lmask_mm + movq lmask_mm, lmask2_mm + movd dmask(%esp), dmask_mm + movq dmask_mm, dmask2_mm + movd %ebx, hold_mm + pxor used_mm, used_mm + movl lcode(%esp), %ebx /* ebx = lcode */ +#endif + + jmp .L_do_loop + +.align 16,0x90 + +#if ! defined ( USE_MMX ) + +.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] */ + +#else /* USE_MMX */ + +.L_do_loop: + psrlq used_mm, hold_mm /* hold_mm >>= last bit length */ + + cmpl $32, bits_r + ja .L_get_length_code /* if (32 < bits) */ + + movd bits_r, tmp_mm + movd (in_r), %mm7 + addl $4, in_r + psllq tmp_mm, %mm7 + addl $32, bits_r + por %mm7, hold_mm /* hold_mm |= *((uint *)in)++ << bits */ + +.L_get_length_code: + pand hold_mm, lmask_mm + movd lmask_mm, %eax + movq lmask2_mm, lmask_mm + movl (%ebx,%eax,4), %eax /* eax = lcode[hold & lmask] */ + +#endif + +#if ! defined( USE_MMX ) + +.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 + +#else /* USE_MMX */ + +#define len_r %edx + +.L_dolen: + movzbl %ah, %ecx /* ecx = this.bits */ + movl %eax, len_r /* len = this */ + shrl $16, len_r /* len = this.val */ + movd %ecx, used_mm + subl %ecx, bits_r /* bits -= this.bits */ + + testb %al, %al + jnz .L_test_for_length_base /* if (op != 0) 45.7% */ + + movb %dl, (out_r) + incl out_r + +#endif + +.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) + ja .L_do_loop /* if (in < last) */ + jmp .L_break_loop + +#if ! defined( USE_MMX ) + +.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] */ + +#else /* USE_MMX */ + +.L_test_for_length_base: + testb $16, %al + jz .L_test_for_second_level_length /* if ((op & 16) == 0) 8% */ + andl $15, %eax /* op &= 15 */ + jz .L_decode_distance /* if (!op) */ + + psrlq used_mm, hold_mm /* hold_mm >>= last bit length */ + movd %eax, used_mm + movd hold_mm, %ecx + subl %eax, bits_r + andl .L_mask(,%eax,4), %ecx + addl %ecx, len_r /* len += hold & mask[op] */ + +.L_decode_distance: + + psrlq used_mm, hold_mm /* hold_mm >>= last bit length */ + + cmpl $32, bits_r + ja .L_get_dist_code /* if (32 < bits) */ + + movd bits_r, tmp_mm + movd (in_r), %mm7 + addl $4, in_r + psllq tmp_mm, %mm7 + addl $32, bits_r + por %mm7, hold_mm /* hold_mm |= *((uint *)in)++ << bits */ + +.L_get_dist_code: + 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] */ + +#endif + +#if ! defined( USE_MMX ) + +#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 + +#else /* USE_MMX */ + +#define dist_r %ebx +.L_dodist: + movzbl %ah, %ecx /* ecx = this.bits */ + movl %eax, dist_r + shrl $16, dist_r /* dist = this.val */ + subl %ecx, bits_r /* bits -= this.bits */ + movd %ecx, used_mm + + testb $16, %al /* if ((op & 16) == 0) */ + jz .L_test_for_second_level_dist + andl $15, %eax /* op &= 15 */ + jz .L_check_dist_one + +.L_add_bits_to_dist: + 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, bits_r /* bits -= op bits */ + andl .L_mask(,%eax,4), %ecx /* ecx = hold & mask[op] */ + addl %ecx, dist_r /* dist += hold & mask[op] */ + jmp .L_check_window + +#endif + +.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 +#if ! defined( USE_MMX ) + movl len(%esp), %ecx +#else + movl len_r, %ecx +#endif + 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 + +#if defined( USE_MMX ) + movl lcode(%esp), %ebx /* move lcode back to %ebx, toss dist */ +#endif + jmp .L_while_test + +.align 16,0x90 + +.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% */ + +#if ! defined( USE_MMX ) + movl len(%esp), %ecx +#else + movl len_r, %ecx +#endif + 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 */ +#if defined( USE_MMX ) + movl lcode(%esp), %ebx /* move lcode back to %ebx, toss dist */ +#endif + jmp .L_while_test + +.align 16,0x90 + +#if ! defined( USE_MMX ) + +.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 + +#else /* USE_MMX */ + +.L_test_for_second_level_length: + 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 + +#endif + +.align 16,0x90 + +#if ! defined( USE_MMX ) + +.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 + +#else /* USE_MMX */ + +.L_test_for_second_level_dist: + 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 + +#endif + +.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; + * } + * } + */ + +#if ! defined( USE_MMX ) +#define len_r %eax + movl len(%esp), len_r +#endif + 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 + +#if ! defined( USE_MMX ) + movl len(%esp), len_r +#endif + 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 + +#if ! defined( USE_MMX ) + movl len(%esp), len_r +#endif + 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 */ +#if defined( USE_MMX ) + movl lcode(%esp), %ebx /* move lcode back to %ebx, toss dist */ +#endif + jmp .L_while_test + +#undef len_r +#undef from_r +#undef dist_r + +.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) */ + +.L_break_loop: + +#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 bitslong_r, %ecx + movl state_strm(strm_r), state_r + shrl $3, %ecx + subl %ecx, in_r + shll $3, %ecx + subl %ecx, bitslong_r + movl out_r, next_out_strm(strm_r) + movl in_r, next_in_strm(strm_r) + movl bitslong_r, bits_state(state_r) + + movl bitslong_r, %ecx + movl $1, %ebx /* overwrites bitslong_r, %bl */ + shll %cl, %ebx + decl %ebx + +#undef bits_r +#undef bitslong_r + +#if ! defined( USE_MMX ) + + andl %ebx, hold_r + movl hold_r, hold_state(state_r) + +#else /* USE_MMX */ + + psrlq used_mm, hold_mm /* hold_mm >>= last bit length */ + movd hold_mm, %ecx + andl %ebx, %ecx + movl %ecx, hold_state(state_r) + +#endif + +#define last_r %ebx + + /* strm->avail_in = in < last ? 5 + (last - in) : 5 - (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 $5, last_r /* last += 5 */ + 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 $5, in_r /* in += 5 */ + 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 + +.L_done: +#if defined( USE_MMX ) + emms +#endif + addl $local_var_size, %esp + popf + popl %ebx + popl %ebp + popl %esi + popl %edi + ret + +.type inflate_fast,@function +.size inflate_fast,.-inflate_fast -- cgit v1.2.3-55-g6feb