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