| 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 |