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Commit ac4c2a3b authored by Joakim Tjernlund's avatar Joakim Tjernlund Committed by Linus Torvalds
Browse files

zlib: optimize inffast when copying direct from output 



JFFS2 uses lesser compression ratio and inflate always ends up in "copy
direct from output" case.

This patch tries to optimize the direct copy procedure.  Uses
get_unaligned() but only in one place.

The copy loop just above this one can also use this optimization, but I
havn't done so as I have not tested if it is a win there too.

On my MPC8321 this is about 17% faster on my JFFS2 root FS than the
original.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: default avatarJoakim Tjernlund <Joakim.Tjernlund@transmode.se>
Cc: Roel Kluin <roel.kluin@gmail.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 129182e5

arch/powerpc/boot/Makefile

+3 −1
Original line number Diff line number Diff line
@@ -20,7 +20,7 @@ 
all: $(obj)/zImage



BOOTCFLAGS    := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \

		 -fno-strict-aliasing -Os -msoft-float -pipe \

		 -fno-strict-aliasing -Os -msoft-float -pipe -D__KERNEL__\

		 -fomit-frame-pointer -fno-builtin -fPIC -nostdinc \

		 -isystem $(shell $(CROSS32CC) -print-file-name=include)

BOOTAFLAGS	:= -D__ASSEMBLY__ $(BOOTCFLAGS) -traditional -nostdinc
@@ -34,6 +34,8 @@ BOOTCFLAGS += -fno-stack-protector 
endif



BOOTCFLAGS	+= -I$(obj) -I$(srctree)/$(obj)

BOOTCFLAGS	+= -include include/linux/autoconf.h -Iarch/powerpc/include

BOOTCFLAGS	+= -Iinclude



DTS_FLAGS	?= -p 1024

lib/zlib_inflate/inffast.c

+44 −11
Original line number Diff line number Diff line
@@ -4,6 +4,8 @@ 
 */



#include <linux/zutil.h>

#include <asm/unaligned.h>

#include <asm/byteorder.h>

#include "inftrees.h"

#include "inflate.h"

#include "inffast.h"
@@ -24,9 +26,11 @@ 
#ifdef POSTINC

#  define OFF 0

#  define PUP(a) *(a)++

#  define UP_UNALIGNED(a) get_unaligned((a)++)

#else

#  define OFF 1

#  define PUP(a) *++(a)

#  define UP_UNALIGNED(a) get_unaligned(++(a))

#endif



/*
@@ -239,18 +243,47 @@ void inflate_fast(z_streamp strm, unsigned start) 
                    }

                }

                else {

		    unsigned short *sout;

		    unsigned long loops;



                    from = out - dist;          /* copy direct from output */

                    do {                        /* minimum length is three */

                        PUP(out) = PUP(from);

                        PUP(out) = PUP(from);

                        PUP(out) = PUP(from);

                        len -= 3;

                    } while (len > 2);

                    if (len) {

                        PUP(out) = PUP(from);

                        if (len > 1)

		    /* minimum length is three */

		    /* Align out addr */

		    if (!((long)(out - 1 + OFF) & 1)) {

			PUP(out) = PUP(from);

			len--;

		    }

		    sout = (unsigned short *)(out - OFF);

		    if (dist > 2) {

			unsigned short *sfrom;



			sfrom = (unsigned short *)(from - OFF);

			loops = len >> 1;

			do

			    PUP(sout) = UP_UNALIGNED(sfrom);

			while (--loops);

			out = (unsigned char *)sout + OFF;

			from = (unsigned char *)sfrom + OFF;

		    } else { /* dist == 1 or dist == 2 */

			unsigned short pat16;



			pat16 = *(sout-2+2*OFF);

			if (dist == 1)

#if defined(__BIG_ENDIAN)

			    pat16 = (pat16 & 0xff) | ((pat16 & 0xff) << 8);

#elif defined(__LITTLE_ENDIAN)

			    pat16 = (pat16 & 0xff00) | ((pat16 & 0xff00) >> 8);

#else

#error __BIG_ENDIAN nor __LITTLE_ENDIAN is defined

#endif

			loops = len >> 1;

			do

			    PUP(sout) = pat16;

			while (--loops);

			out = (unsigned char *)sout + OFF;

		    }

		    if (len & 1)

			PUP(out) = PUP(from);

                }

            }

            else if ((op & 64) == 0) {          /* 2nd level distance code */