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microblaze: Simplify logic for unaligned byte copying 

Save jump instruction for unaligned byte copying.

Signed-off-by: Michal Simek <monstr@monstr.eu>
This commit is contained in:
Michal Simek 2011-06-10 11:08:57 +02:00
parent c83858b3e6
commit 782d491fc2
1 changed files with 3 additions and 5 deletions
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8
arch/microblaze/lib/uaccess_old.S
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@ -120,11 +120,10 @@ __copy_tofrom_user:
* r4 - tempval * r4 - tempval
*/ */
beqid r7, 0f /* zero size is not likely */ 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 */ or r3, r5, r6 /* find if is any to/from unaligned */
andi r3, r3, 0x3 /* mask unaligned */ or r3, r3, r7 /* find if count is unaligned */
bneid r3, bu1 /* it is unaligned -> then jump */ andi r3, r3, 0x3 /* mask last 3 bits */
bneid r3, bu1 /* if r3 is not zero then byte copying */
or r3, r0, r0 or r3, r0, r0
w1: lw r4, r6, r3 /* at least one 4 byte copy */ w1: lw r4, r6, r3 /* at least one 4 byte copy */
@ -141,7 +140,6 @@ w2: sw r4, r5, r3
.word w2, 0f; .word w2, 0f;
.text .text
bu: or r3, r0, r0
bu1: lbu r4,r6,r3 bu1: lbu r4,r6,r3
bu2: sb r4,r5,r3 bu2: sb r4,r5,r3
addik r7,r7,-1 addik r7,r7,-1