diff options
| author | Michal Simek <monstr@monstr.eu> | 2011-06-10 11:08:57 +0200 |
|---|---|---|
| committer | Michal Simek <monstr@monstr.eu> | 2011-10-14 12:24:25 +0200 |
| commit | 782d491fc210fac03976d01071145728339b6887 (patch) | |
| tree | 04350521d9f3a38b326b56cadaa81512b9b3820e /arch/microblaze/lib/uaccess_old.S | |
| parent | c83858b3e6e8db9dbb17641de1a2420bb102ae31 (diff) | |
microblaze: Simplify logic for unaligned byte copying
Save jump instruction for unaligned byte copying.
Signed-off-by: Michal Simek <monstr@monstr.eu>
Diffstat (limited to 'arch/microblaze/lib/uaccess_old.S')
| -rw-r--r-- | arch/microblaze/lib/uaccess_old.S | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/arch/microblaze/lib/uaccess_old.S b/arch/microblaze/lib/uaccess_old.S index 6dfd4a08726..d09f2dce648 100644 --- a/arch/microblaze/lib/uaccess_old.S +++ b/arch/microblaze/lib/uaccess_old.S @@ -120,11 +120,10 @@ __copy_tofrom_user: * r4 - tempval */ beqid r7, 0f /* zero size is not likely */ - andi r3, r7, 0x3 /* filter add count */ - bneid r3, bu /* if is odd value then byte copying */ or r3, r5, r6 /* find if is any to/from unaligned */ - andi r3, r3, 0x3 /* mask unaligned */ - bneid r3, bu1 /* it is unaligned -> then jump */ + or r3, r3, r7 /* find if count is unaligned */ + andi r3, r3, 0x3 /* mask last 3 bits */ + bneid r3, bu1 /* if r3 is not zero then byte copying */ or r3, r0, r0 w1: lw r4, r6, r3 /* at least one 4 byte copy */ @@ -141,7 +140,6 @@ w2: sw r4, r5, r3 .word w2, 0f; .text -bu: or r3, r0, r0 bu1: lbu r4,r6,r3 bu2: sb r4,r5,r3 addik r7,r7,-1 |