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2009-07-27 Aurelien Jarno <aurelien@aurel32.net>
* sysdeps/alpha/memchr.S: Use prefetch load.
* sysdeps/alpha/alphaev6/memchr.S: Likewise.
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
--- glibc-2.10.1.orig/glibc-ports-2.10.1/sysdeps/alpha/alphaev6/memchr.S 2009-05-16 10:36:20.000000000 +0200
+++ glibc-2.10.1/glibc-ports-2.10.1/sysdeps/alpha/alphaev6/memchr.S 2009-11-13 00:51:15.000000000 +0100
@@ -127,7 +127,7 @@
cmpbge $31, $1, $2 # E :
bne $2, $found_it # U :
# At least one byte left to process.
- ldq $1, 8($0) # L :
+ ldq $31, 8($0) # L :
subq $5, 1, $18 # E : U L U L
addq $0, 8, $0 # E :
@@ -143,38 +143,38 @@
and $4, 8, $4 # E : odd number of quads?
bne $4, $odd_quad_count # U :
# At least three quads remain to be accessed
- mov $1, $4 # E : L U L U : move prefetched value to correct reg
+ nop # E : L U L U : move prefetched value to correct reg
.align 4
$unrolled_loop:
- ldq $1, 8($0) # L : prefetch $1
- xor $17, $4, $2 # E :
- cmpbge $31, $2, $2 # E :
- bne $2, $found_it # U : U L U L
+ ldq $1, 0($0) # L : load quad
+ xor $17, $1, $2 # E :
+ ldq $31, 8($0) # L : prefetch next quad
+ cmpbge $31, $2, $2 # E : U L U L
+ bne $2, $found_it # U :
addq $0, 8, $0 # E :
nop # E :
nop # E :
- nop # E :
$odd_quad_count:
+ ldq $1, 0($0) # L : load quad
xor $17, $1, $2 # E :
- ldq $4, 8($0) # L : prefetch $4
+ ldq $31, 8($0) # L : prefetch $4
cmpbge $31, $2, $2 # E :
- addq $0, 8, $6 # E :
+ addq $0, 8, $6 # E :
bne $2, $found_it # U :
cmpult $6, $18, $6 # E :
addq $0, 8, $0 # E :
- nop # E :
bne $6, $unrolled_loop # U :
- mov $4, $1 # E : move prefetched value into $1
nop # E :
nop # E :
-
-$final: subq $5, $0, $18 # E : $18 <- number of bytes left to do
nop # E :
+
+$final: ldq $1, 0($0) # L : load last quad
+ subq $5, $0, $18 # E : $18 <- number of bytes left to do
nop # E :
bne $18, $last_quad # U :
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
--- glibc-2.10.1.orig/glibc-ports-2.10.1/sysdeps/alpha/memchr.S 2009-05-16 10:36:20.000000000 +0200
+++ glibc-2.10.1/glibc-ports-2.10.1/sysdeps/alpha/memchr.S 2009-11-13 00:51:15.000000000 +0100
@@ -119,7 +119,7 @@
# At least one byte left to process.
- ldq t0, 8(v0) # e0 :
+ ldq zero, 8(v0) # e0 : prefetch next quad
subq t4, 1, a2 # .. e1 :
addq v0, 8, v0 #-e0 :
@@ -138,19 +138,19 @@
# At least three quads remain to be accessed
- mov t0, t3 # e0 : move prefetched value to correct reg
-
.align 4
$unrolled_loop:
- ldq t0, 8(v0) #-e0 : prefetch t0
- xor a1, t3, t1 # .. e1 :
- cmpbge zero, t1, t1 # e0 :
- bne t1, $found_it # .. e1 :
+ ldq t0, 0(v0) # e0 : load quad
+ xor a1, t0, t1 # .. e1 :
+ ldq zero, 8(v0) # e0 : prefetch next quad
+ cmpbge zero, t1, t1 # .. e1:
+ bne t1, $found_it # e0 :
- addq v0, 8, v0 #-e0 :
+ addq v0, 8, v0 # e1 :
$odd_quad_count:
+ ldq t0, 0(v0) # e0 : load quad
xor a1, t0, t1 # .. e1 :
- ldq t3, 8(v0) # e0 : prefetch t3
+ ldq zero, 8(v0) # e0 : prefetch next quad
cmpbge zero, t1, t1 # .. e1 :
addq v0, 8, t5 #-e0 :
bne t1, $found_it # .. e1 :
@@ -159,8 +159,8 @@
addq v0, 8, v0 # .. e1 :
bne t5, $unrolled_loop #-e1 :
- mov t3, t0 # e0 : move prefetched value into t0
-$final: subq t4, v0, a2 # .. e1 : a2 <- number of bytes left to do
+$final: ldq t0, 0(v0) # e0 : load last quad
+ subq t4, v0, a2 # .. e1 : a2 <- number of bytes left to do
bne a2, $last_quad # e1 :
$not_found:
diff -durN glibc-2.10.1.orig/ports/sysdeps/alpha/alphaev6/memchr.S glibc-2.10.1/ports/sysdeps/alpha/alphaev6/memchr.S
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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