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patches/glibc/ports-2.10.1/540-alpha-fix-memchr.patch
author "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
Wed Dec 30 15:36:22 2009 +0100 (2009-12-30)
changeset 1669 61edd9d19e3c
permissions -rw-r--r--
scripts/functions: add aria2, a powerfull downloader

aria2 is a powerfull downloader that is capable of chunking and
parallel retrieval.

Due to li;itations in crosstool-NG retrieval facilities, it's not possible
to take fully advantage of aria2. It might happen that, in the future,
those limitations get lifted away, so we can take use features such as
parallel downloading from more than one server at the same time. For now,
it should still speed up downloads thanks to parallel downloading of chunks. 
     1 2009-07-27  Aurelien Jarno  <aurelien@aurel32.net>

     2 

     3 	* sysdeps/alpha/memchr.S: Use prefetch load.

     4 	* sysdeps/alpha/alphaev6/memchr.S: Likewise.

     5 

     6 diff -durN glibc-2.10.1.orig/glibc-ports-2.10.1/sysdeps/alpha/alphaev6/memchr.S glibc-2.10.1/glibc-ports-2.10.1/sysdeps/alpha/alphaev6/memchr.S

     7 --- glibc-2.10.1.orig/glibc-ports-2.10.1/sysdeps/alpha/alphaev6/memchr.S	2009-05-16 10:36:20.000000000 +0200

     8 +++ glibc-2.10.1/glibc-ports-2.10.1/sysdeps/alpha/alphaev6/memchr.S	2009-11-13 00:51:15.000000000 +0100

     9 @@ -127,7 +127,7 @@

    10          cmpbge  $31, $1, $2	# E :

    11          bne     $2, $found_it	# U :

    12  	# At least one byte left to process.

    13 -	ldq	$1, 8($0)	# L :

    14 +	ldq	$31, 8($0)	# L :

    15  	subq	$5, 1, $18	# E : U L U L

    16  

    17  	addq	$0, 8, $0	# E :

    18 @@ -143,38 +143,38 @@

    19  	and	$4, 8, $4	# E : odd number of quads?

    20  	bne	$4, $odd_quad_count # U :

    21  	# At least three quads remain to be accessed

    22 -	mov	$1, $4		# E : L U L U : move prefetched value to correct reg

    23 +	nop			# E : L U L U : move prefetched value to correct reg

    24  

    25  	.align	4

    26  $unrolled_loop:

    27 -	ldq	$1, 8($0)	# L : prefetch $1

    28 -	xor	$17, $4, $2	# E :

    29 -	cmpbge	$31, $2, $2	# E :

    30 -	bne	$2, $found_it	# U : U L U L

    31 +	ldq	$1, 0($0)	# L : load quad

    32 +	xor	$17, $1, $2	# E :

    33 +	ldq	$31, 8($0)	# L : prefetch next quad

    34 +	cmpbge	$31, $2, $2	# E : U L U L

    35  

    36 +	bne	$2, $found_it	# U :

    37  	addq	$0, 8, $0	# E :

    38  	nop			# E :

    39  	nop			# E :

    40 -	nop			# E :

    41  

    42  $odd_quad_count:

    43 +	ldq	$1, 0($0)	# L : load quad

    44  	xor	$17, $1, $2	# E :

    45 -	ldq	$4, 8($0)	# L : prefetch $4

    46 +	ldq	$31, 8($0)	# L : prefetch $4

    47  	cmpbge	$31, $2, $2	# E :

    48 -	addq	$0, 8, $6	# E :

    49  

    50 +	addq	$0, 8, $6	# E :

    51  	bne	$2, $found_it	# U :

    52  	cmpult	$6, $18, $6	# E :

    53  	addq	$0, 8, $0	# E :

    54 -	nop			# E :

    55  

    56  	bne	$6, $unrolled_loop # U :

    57 -	mov	$4, $1		# E : move prefetched value into $1

    58  	nop			# E :

    59  	nop			# E :

    60 -

    61 -$final:	subq	$5, $0, $18	# E : $18 <- number of bytes left to do

    62  	nop			# E :

    63 +

    64 +$final:	ldq	$1, 0($0)	# L : load last quad

    65 +	subq	$5, $0, $18	# E : $18 <- number of bytes left to do

    66  	nop			# E :

    67  	bne	$18, $last_quad	# U :

    68  

    69 diff -durN glibc-2.10.1.orig/glibc-ports-2.10.1/sysdeps/alpha/memchr.S glibc-2.10.1/glibc-ports-2.10.1/sysdeps/alpha/memchr.S

    70 --- glibc-2.10.1.orig/glibc-ports-2.10.1/sysdeps/alpha/memchr.S	2009-05-16 10:36:20.000000000 +0200

    71 +++ glibc-2.10.1/glibc-ports-2.10.1/sysdeps/alpha/memchr.S	2009-11-13 00:51:15.000000000 +0100

    72 @@ -119,7 +119,7 @@

    73  

    74  	# At least one byte left to process.

    75  

    76 -	ldq	t0, 8(v0)	# e0	:

    77 +	ldq	zero, 8(v0)	# e0	: prefetch next quad

    78  	subq	t4, 1, a2	# .. e1 :

    79  	addq	v0, 8, v0	#-e0	:

    80  

    81 @@ -138,19 +138,19 @@

    82  

    83  	# At least three quads remain to be accessed

    84  

    85 -	mov	t0, t3		# e0	: move prefetched value to correct reg

    86 -

    87  	.align	4

    88  $unrolled_loop:

    89 -	ldq	t0, 8(v0)	#-e0	: prefetch t0

    90 -	xor	a1, t3, t1	# .. e1 :

    91 -	cmpbge	zero, t1, t1	# e0	:

    92 -	bne	t1, $found_it	# .. e1 :

    93 +	ldq	t0, 0(v0)	# e0	: load quad

    94 +	xor	a1, t0, t1	# .. e1 :

    95 +	ldq	zero, 8(v0)	# e0	: prefetch next quad

    96 +	cmpbge	zero, t1, t1	# .. e1:

    97 +	bne	t1, $found_it	# e0    :

    98  

    99 -	addq	v0, 8, v0	#-e0	:

   100 +	addq	v0, 8, v0	#    e1	:

   101  $odd_quad_count:

   102 +	ldq	t0, 0(v0)	# e0	: load quad

   103  	xor	a1, t0, t1	# .. e1 :

   104 -	ldq	t3, 8(v0)	# e0	: prefetch t3

   105 +	ldq	zero, 8(v0)	# e0	: prefetch next quad

   106  	cmpbge	zero, t1, t1	# .. e1 :

   107  	addq	v0, 8, t5	#-e0	:

   108  	bne	t1, $found_it	# .. e1	:

   109 @@ -159,8 +159,8 @@

   110  	addq	v0, 8, v0	# .. e1 :

   111  	bne	t5, $unrolled_loop #-e1 :

   112  

   113 -	mov	t3, t0		# e0	: move prefetched value into t0

   114 -$final:	subq	t4, v0, a2	# .. e1	: a2 <- number of bytes left to do

   115 +$final:	ldq	t0, 0(v0)	# e0	: load last quad

   116 +	subq	t4, v0, a2	# .. e1	: a2 <- number of bytes left to do

   117  	bne	a2, $last_quad	# e1	:

   118  

   119  $not_found:

   120 diff -durN glibc-2.10.1.orig/ports/sysdeps/alpha/alphaev6/memchr.S glibc-2.10.1/ports/sysdeps/alpha/alphaev6/memchr.S

   121 diff -durN glibc-2.10.1.orig/ports/sysdeps/alpha/memchr.S glibc-2.10.1/ports/sysdeps/alpha/memchr.S
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